Post on 09-Nov-2015
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INDICE
Diagramas Elctricos 2
Motor 15
Tren Delantero 733
Consola Central, Panel de Instrumentos 782
Puertas, accesorios, espejos 825
SIR (Airbags) 855
Tabla de Conversin de Medidas 871
Transmisin Automtica 900
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DIAGRAMAS ELECTRICOS
Electrical Center Identification Views
Document ID: 353473
Underhood Bussed Electrical Center (UBEC) Details (Base Pickup)
Click here for full size
No.
Fuse/Circuit
Breaker Rating Description
Maxi Fuses
1 INT BATT 50A HDLP SW, MIR/LKS, AUX PWR, RDO BATT,
CIGAR LTR, CTSY LP, and PWR LKS Fuses
2 ABS 60A Electronic Brake Control Module (EBCM) Assembly
3-4 Not Used
5 IGN B 50A Ignition Switch
6 RAP 50A Retained Accessory Power Relay
7 IGN A 40A Starter Relay and Ignition Switch
8 STUD #2 30A Not Used
Mini Fuses
9-
11 Not Used
12 VEH B/U 15A Backup Lamps, Right and Left
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13 RT TURN 10A Turn Signal Assembly, Right Front
14 LT TURN 10A Turn Signal Assembly, Left Front
15 LT TRN 10A Tail Lamp Assembly, Left Rear
16 RT TRN 10A Tail Lamp Assembly, Right Rear
17 RR PRK 10A License Lamp, Marker Lamp Assembly, and Tail Lamp
Assembly (All Right Side)
18 FR PRK 10A Turn Signal Lamp Assembly and Tail Lamp Assembly
(All Right Side)
19 Not Used
20 LT HDLP 10A Headlamp Low Beam, Left Side, and Daytime Running
Lamp (DRL) Relay
21 RT HDLP 10A Headlamp Low Beam and Headlamp High Beam (All
Right Side)
22 ENG 1 10A
Evaporative Emission Canister Purge Solenoid,
Evaporative Emission Canister Vent Solenoid, Mass Air
Flow Sensor (4.3L), and Camshaft Position Sensor
(4.3L)
23 ECM B 20A
Fuel Pump Relay, Powertrain Control Module (PCM)
(2.2L), Vehicle Control Module (4.3L), and Fuel Pump
and Engine Oil Pressure Gauge Sensor
24 HORN 15A Horn, Left and Right Side
25 ECM 1 15A
Electronic Ignition Control Module, Powertrain Control
Module/Vehicle Control Module, Crankshaft Position
Sensor, Fuel Injectors 1-6, and Ignition Coil
26 BTSI 10A Stop Lamp Switch Assembly and Transfer Case Control
Module
27 B/U LP 25A Backup Lamps Switch/Transmission Range Switch
28 Not Used
29 IGN E 10A A/C Compressor Clutch Relay
30 FOG LP 15A Fog Lamp Relay and Headlamp Ground Relay
31 OXYSEN 20A
Heated Oxygen Sensor, Post-Converter (2.2L), Heated
Oxygen Sensor, Left Front, Heated Oxygen Sensor,
Post-Converter, Heated Oxygen Sensor, Right Front, and
Heated Oxygen Sensor, Pre-Converter
32 LR PRK 10A Tail Lamp Assembly, Left Side, Marker Lamp
Assembly, Left Rear, and License Lamp, Left Side
33 IGN C 20A Ignition Switch
34 Not Used
35 PARK LP 20A Park Lamp Relay and Headlamp Switch Assembly
36 Not Used
37 Not Used
38 HVAC 30A Blower Motor Relay
39-
40 Not Used
41 CRANK 10A Transfer Case Control Module, Manual Transmission
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Clutch Start Switch, and Transmission Range Switch
(Automatic)
42 HAZ LP 20A Hazard Switch
43 VECHMSL 10A Dome and High Mounted Stop Lamp and Cruise Control
Module
44 Not Used
45 STOP LP 20A High Mounted Stop Lamp Relay and Stop Lamp Switch
46 TBC 10A Truck Body Control Module (TBC) and RFA Module
Assembly (Remote Keyless Entry)
Micro Relays
47 HDLP PWR Power Supply to the Headlamps
48 DRL Power Supply to the Daytime Running Lamps (DRL)
49 F/Pump Power Supply to the Fuel Pump
50 Horn Power Supply to the Horns
51 Not Used
52 HDLP GRD Ground Supply to the Headlamps
53 Not Used
54 CHMSL Power Supply to the Rear Brake Lamps
Mini Relays
55 Starter Power Supply to the Starter
56 Not Used
Diode
57 DRL Prevent Feedback from the DRL Relay
Underhood Bussed Electrical Center (UBEC) Details (Uplevel Pickup)
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No.
Fuse/Circuit
Breaker Rating Description
Maxi Fuses
1 INT BATT 50A HDLP SW, MIR/LKS, AUX PWR, RDO BATT,
CIGAR LTR, CTSY LP, and PWR LKS Fuses
2 ABS 60A Electronic Brake Control Module (EBCM) Assembly
3-4 Not Used
5 IGN B 50A Ignition Switch
6 RAP 50A Retained Accessory Power Relay
7 IGN A 40A Starter Relay and Ignition Switch
8 STUD#2 30A Not Used
Mini Fuses
9-
11 Not Used
12 VEH B/U 15A Backup Lamps, Right and Left
13 RT TURN 10A Turn Signal Assembly, Right Front
14 LT TURN 10A Turn Signal Assembly, Left Front
15 LT TRN 10A Tail Lamp Assembly, Left Rear
16 RT TRN 10A Tail Lamp Assembly, Right Rear
17 RR PRK 10A License Lamp, Marker Lamp Assembly, and Tail Lamp
Assembly (All Right Side)
18 FR PRK 10A Turn Signal Lamp Assembly and Tail Lamp Assembly
(All Right Side)
19 Not Used
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20 LT HDLP 10A
Headlamp Low Beam Left, Headlamp High BeamLeft
(ZR2 w/ Service Harness), and Daytime Running Lamp
(DRL) Relay
21 RT HDLP 10A Right Headlamps
22 ENG 1 10A
Evaporative Emission Canister Purge Solenoid,
Evaporative Emission Canister Vent Solenoid, Mass Air
Flow Sensor (4.3L), and Camshaft Position Sensor
(4.3L)
23 ECM B 20A
Fuel Pump Relay, Powertrain Control Module (PCM)
(2.2L), Vehicle Control Module (4.3L), and Fuel Pump
and Engine Oil Pressure Gauge Sensor
24 HORN 15A Horn, Left and Right Side
25 ECM 1 15A
Electronic Ignition Control Module, Powertrain Control
Module/Vehicle Control Module, Crankshaft Position
Sensor, Fuel Injectors 1-6, and Ignition Coil
26 BTSI 10A Stop Lamp Switch Assembly and Transfer Case Control
Module
27 B/U LP 25A Backup Lamps Switch/Transmission Range Switch
28 A/C 10A A/C Compressor Clutch Relay
29 IGN E 10A A/C Compressor Clutch Relay
30 FOG LP 15A Fog Lamp Relay and Headlamp Ground Relay
31 OXYSEN 20A
Heated Oxygen Sensor, Post-Converter (2.2L), Heated
Oxygen Sensor, Left Front, Heated Oxygen Sensor,
Post-Converter, Heated Oxygen Sensor, Right Front, and
Heated Oxygen Sensor, Pre-Converter
32 LR PRK 10A Tail Lamp Assembly, Left Side, Marker Lamp
Assembly, Left Rear, and License Lamp, Left Side
33 IGN C 20A Ignition Switch
34 Not Used
35 PARK LP 20A Park Lamp Relay and Headlamp Switch Assembly
36 ATC 20A Transfer Case Control Module
37 Not Used
38 HVAC 30A Blower Motor Relay
39-
40 Not Used
41 CRANK 10A
Transfer Case Control Module, Manual Transmission
Clutch Start Switch, and Transmission Range Switch
(Automatic)
42 HAZ LP 20A Hazard Switch
43 VECHMSL 10A Dome and High Mounted Stop Lamp and Cruise Control
Module
44 Not Used
45 STOP LP 20A High Mounted Stop Lamp Relay and Stop Lamp Switch
46 TBC 10A Truck Body Control Module (TBC) and RFA Module
Assembly (Remote Keyless Entry)
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Micro Relays
47 HDLP PWR Power Supply to the Headlamps
48 DRL Power Supply to the Daytime Running Lamps (DRL)
49 F/Pump Power Supply to the Fuel Pump
50 Horn Power Supply to the Horns
51 A/C A/C Compressor Relay
52 HDLP GRD Ground Supply to the Headlamps
53 FOG LP Power Supply to the Fog Lamps
54 CHMSL Power Supply to the Rear Brake Lamps
Mini Relays
55 Starter Power Supply to the Starter
56 Not Used
Diode
57 DRL Prevent Feedback from the DRL Relay
Underhood Bussed Electrical Center (UBEC) Details (Uplevel Utility)
Click here for full size
No.
Fuse/Circuit
Breaker Rating Description
Maxi Fuses
1 INT BATT 50A HDLP SW, MIR/LKS, AUX PWR, RDO BATT,
CIGAR LTR, CTSY LP, and PWR LKS Fuses
2 ABS 60A Electronic Brake Control Module (EBCM) Assembly
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3-4 Not Used
5 IGN B 50A Ignition Switch
6 RAP 50A Retained Accessory Power Relay
7 IGN A 40A Starter Relay and Ignition Switch
8 STUD#2 30A AUX PWR Stud, UBEC
Mini Fuses
9 TRL TRN 10A Turn Signal, Left Side Trailer
10 TRR TRN 10A Turn Signal, Right Side Trailer
11 TRL B/U 10A Backup Lamp, Trailer
12 VEH B/U 15A Backup Lamps, Right and Left
13 RT TURN 10A Turn Signal Assembly, Right Front
14 LT TURN 10A Turn Signal Assembly, Left Front
15 LT TRN 10A Tail Lamp Assembly, Left Rear
16 RT TRN 10A Tail Lamp Assembly, Right Rear
17 RR PRK 10A Tail Lamp Assembly, Right Side
18 FR PRK 10A Front Turn Signal Lamp Assembly, RH, LH
19 TRL PRK 10A Tail Lamp, Trailer, LH, RH, Vehicle Lisense Plate
Lamps
20 LT HDLP 10A Headlamp Low Beam, Left Side, and Daytime Running
Lamp (DRL) Relay
21 RT HDLP 10A Headlamp Low Beam and Headlamp High Beam (All
Right Side)
22 ENG 1 10A
Evaporative Emission Canister Purge Solenoid,
Evaporative Emission Canister Vent Solenoid, Mass Air
Flow Sensor (4.3L), and Camshaft Position Sensor
(4.3L)
23 ECM B 20A
Fuel Pump Relay, Powertrain Control Module (PCM)
(2.2L), Vehicle Control Module (4.3L), and Fuel Pump
and Engine Oil Pressure Gauge Sensor
24 HORN 15A Horn, Left and Right Side
25 ECM 1 15A
Electronic Ignition Control Module, Powertrain Control
Module/Vehicle Control Module, Crankshaft Position
Sensor, Fuel Injectors 1-6, and Ignition Coil
26 BTSI 10A Stop Lamp Switch Assembly/BTSI Solenoid and
Transfer Case Control Module
27 B/U LP 25A Backup Lamps Switch/Transmission Range Switch
28 A/C 10A A/C Compressor Clutch Relay
29 IGN E 10A A/C Compressor Clutch Relay
30 FOG LP 15A Fog Lamp Relay and Headlamp Ground Relay
31 OXYSEN 20A
Heated Oxygen Sensor, Post-Converter (2.2L), Heated
Oxygen Sensor, Left Front, Heated Oxygen Sensor,
Post-Converter, Heated Oxygen Sensor, Right Front
32 LR PRK 10A Tail Lamp Assembly, Left Side, Marker Lamp
Assembly, Left Rear, and License Lamp, Left Side
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33 IGN C 20A Ignition Switch
34 HTD SEAT 20A Heated Seat Assembly
35 PARK LP 20A Park Lamp Relay and Headlamp Switch Assembly
36 ATC 20A Transfer Case Control Module
37 RRDEFOG 30A Rear Window Defogger
38 HVAC 30A Blower Motor Relay/Blower Motor
39 TRCHMSL 10A Trailer Wiring Provision
40 RR W/W 15A Rear Window Wiper
41 CRANK 10A
Transfer Case Control Module, Manual Transmission
Clutch Start Switch, and Transmission Range Switch
(Automatic)
42 HAZ LP 20A Hazard Switch
43 VECHMSL 10A Dome and Mounted Stop Lamp and Cruise Control
Module
44 HTDMIR 10A Heated Mirrors
45 STOP LP 20A Stop Lamp Switch, High Mounted Stop Lamp Relay
46 TBC 10A Truck Body Control Module (TBC) and RFA Module
Assembly (Remote Keyless Entry)
Micro Relays
47 HDLP PWR Power Supply to the Headlamps
48 DRL Power Supply to the Daytime Running Lamps (DRL)
49 F/Pump Power Supply to the Fuel Pump
50 Horn Power Supply to the Horns
51 A/C A/C Compressor Relay
52 HDLP GRD Ground Supply to the Headlamps
53 FOG LP Power Supply to the Fog Lamps
54 Not Used
Mini Relays
55 Starter Power Supply to the Starter
56 RR DEFOG Power Supply to the Rear Defog
Diode
57 DRL Prevent Feedback from the DRL Relay
Underhood Bussed Electrical Center (UBEC) Details (Envoy)
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No.
Fuse/Circuit
Breaker Rating Description
Maxi Fuses
1 INT BATT 60A HDLP SW, MIR/LKS, AUX PWR, RDO BATT, CIGAR
LTR, CTSY LP, and PWR LKS Fuses
2 ABS 60A Electronic Brake Control Module (EBCM) Assembly
3-4 Not Used
5 IGN B 50A Ignition Switch
6 RAP 50A Retained Accessory Power Relay
7 IGN A 40A Starter Relay and Ignition Switch
8 STUD 30A Not Used
Mini Fuses
9 TRL TRN 10A Turn Signal, Left Side Trailer
10 TRR TRN 10A Turn Signal, Right Side Trailer
11 TRL B/U 10A Backup Lamp, Trailer
12 VEH B/U 15A Backup Lamps, Right and Left
13 RT TURN 10A Turn Signal Assembly, Right Front
14 LT TURN 10A Turn Signal Assembly, Left Front
15 LT TRN 10A Tail Lamp Assembly, Left Rear
16 RT TRN 10A Tail Lamp Assembly, Right Rear
17 RR PRK 10A License Lamp, Marker Lamp Assembly, and Tail Lamp
Assembly (All Right Side)
18 FR PRK 10A Turn Signal Lamp Assembly and Tail Lamp Assembly
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(All Right Side)
19 TRL PRK 10A Tail Lamp, Trailer
20 LT HDLP 10A Headlamp Low Beam, Left Side, and Daytime Running
Lamp (DRL) Relay
21 RT HDLP 10A Headlamp Low Beam and Headlamp High Beam (All
Right Side)
22 ENG 1 10A
Evaporative Emission Canister Purge Solenoid,
Evaporative Emission Canister Vent Solenoid, Mass Air
Flow Sensor (4.3L), and Camshaft Position Sensor (4.3L)
23 ECM B 20A
Fuel Pump Relay, Powertrain Control Module (PCM)
(2.2L), Vehicle Control Module (4.3L), and Fuel Pump
and Engine Oil Pressure Gauge Sensor
24 LT HI 15A Left Hi Beam
25 RT HI 15A Right Hi Beam
26 HORN 10A Horn, Left and Right Side
27 ECM 1 15A
Electronic Ignition Control Module, Powertrain Control
Module/Vehicle Control Module, Crankshaft Position
Sensor, Fuel Injectors 1-6, and Ignition Coil
28 DRL 15A Daytime Running Lamps
29 BTSI 10A Stop Lamp Switch Assembly and Transfer Case Control
Module
30 B/U LP 25A Backup Lamps Switch/Transmission Range Switch
31 A/C 10A A/C Compressor Clutch Relay
32 IGN E 10A A/C Compressor Clutch Relay
33 FOG LP 15A Fog Lamp Relay and Headlamp Ground Relay
34 OXYGEN 20A
Heated Oxygen Sensor, Post-Converter (2.2L), Heated
Oxygen Sensor, Left Front, Heated Oxygen Sensor, Post-
Converter, Heated Oxygen Sensor, Right Front, and
Heated Oxygen Sensor, Pre-Converter
35 LR PRK 10A Tail Lamp Assembly, Left Side, Marker Lamp
Assembly, Left Rear, and License Lamp, Left Side
36 IGN C 20A Ignition Switch
37 HTD SEAT 20A Heated Seat Assembly
38 PARK LP 20A Park Lamp Relay and Headlamp Switch Assembly
39 ATC 20A Transfer Case Control Module
40 RRDEFOG 30A Rear Window Defogger
41 HVAC 30A Blower Motor Relay
42 TRCHMSL 10A Blunt Cut Wire
43 RR W/W 15A Rear Window Wiper
44 CRANK 10A
Transfer Case Control Module, Manual Transmission
Clutch Start Switch, and Transmission Range Switch
(Automatic)
45 LD LEV 25A Load Leveling
46 HI BEAM 20A HID Headlamps
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47 HAZ LP 20A Hazard Switch
48 VECHMSL 10A Dome and High Mounted Stop Lamp and Cruise Control
Module
49 HTDMIR 10A Heated Mirrors
50 STOP LP 20A High Mounted Stop Lamp Relay and Stop Lamp Switch
51 TBC 10A Truck Body Control Module (TBC) and RFA Module
Assembly (Remote Keyless Entry)
Micro Relays
52 DRL Power Supply to the Daytime Running Lamps (DRL)
53 F/Pump Power Supply to the Fuel Pump
54 Horn Power Supply to the Horns
55 A/C A/C Compressor Relay
56 FOG LP Power Supply to the Fog Lamps
Mini Relays
57 LOW BEAM Power Supply to the Low Beam Headlamps
58 STARTER Power Supply to the Starter
59 RR DEFOG Power Supply to the Rear Defog
IP Fuse Block Details
Click here for full size
Fuse
No.
Fuse/Circuit
Breaker Rating Description
Power
Windows/Circuit 30A
Door Lock and Side Window Switch Assembly,
Left and Right Side
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Breaker A
1 HDLP SW 10A Headlamp Switch
2 CIGAR LTR 15A Cigar Lighter and Data Link Connector
3 CRUISE 10A Truck Body Control Module (TBC), Cruise
Control Module and Cruise Control Switch
4 GAUGES 10A Truck Body Control Module (TBC) and
Instrument Cluster
5 ILLUM 10A
Radio, Heater Controller (Non-A/C), Heater and
A/C Controller (w/ A/C), Fog Lamp Switch, IP
Module Switch, Truck Body Control Module
(TBC), Transfer Case Select Switch, and
Instrument Cluster
6 Not Used
7 MIR/LKS 5A
Outside Rear View Mirror Switch and Door
Lock and Side Window Switch Assembly, Left
and Right Side
8 CTSY LP 10A
Console Courtesy Lamp, Left and Right Side,
Transfer Case Control Module and Inadvertent
Power Lamp Relay
9 HVAC 20A Heater Controller (Non-A/C) and Heater and
A/C Controller (w/ A/C)
10 TURN 20A Hazard Lamp Switch and Turn Signal Switch
11 CLSTR 10A
Instrument Cluster, Powertrain Control Module
(2.2L), Vehicle Control Module (4.3L), and
Automatic Transmission
12 PARK LPS 10A
IP Ashtray Lamp, Truck Body Control Module
(TBC), Outside Rear View Mirror Switch, and
Door Lock and Side Window Switch Assembly,
Left and Right Side
13 AUX PWR 20A Auxiliary Power Outlet, Left and Right Side
14 PWR LKS 15A Door Lock Relay, Door Unlock Relay, and
Driver Door Lock Relay
15 4WD 10A
Vehicle Control Module, Transfer Case Select
Switch, Transfer Case Control Module, and
Front Axle Switch
16 SIR 15A IP Module Switch and Supplemental Restraint
Sensing and Diagnostic Module
17 FRT WPR 25A Windshield Wiper Motor and Windshield
Wiper/Washer Control Switch
18 Not Used
19 RDO BATT 15A Radio and Instrument Cluster
20 AMP F (Envoy
Only) 25A Amplifier
21 HVAC1 10A Air Temperature Valve and Air Temperature
Valve Electric Actuator
22 ABS 10A Stop Lamp Switch and Electronic Brake Control
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Module Assembly
23 RR WPR 15A Rear Wiper Switch, Rear Window Washer Motor
24 RDO IGN 10A Radio
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MOTOR
Key and Lock Cylinder Coding
Document ID: 102500
Key Identification and Usage
The lock cylinder keyway is designed so that other model keys will not enter a current
model lock cylinder. A single key is used for all locks on the vehicle.
The key identification is obtained from the five-character key code stamped on the
knockout portion of the key head. Knock the plugs out of the key head after code
numbers have been recorded. The code list, available to owners of key cutting
equipment from equipment suppliers, determines the lock combinations from the code
numbers.
Cutting Keys
After the code has been determined from the code list or the key code diagram, perform
the following steps:
1. Cut a blank key to the proper level of each of the tumbler positions.
2. Inspect the key operation in the lock cylinder.
Replacement Lock Cylinders
New lock cylinders except ignition lock cylinders are available from the service parts
warehouse with new lock cylinder locking bars. The tumblers are also available and
must be assembled into the cylinder as recommended. For additional information, refer
to the following.
Lock Cylinder Tumbler Operation
All lock tumblers are shaped alike with the exception of the notched position on one
side. As the key is inserted into the lock cylinder, the tumblers are lowered to the correct
height so that notches on each tumbler are at the same level. When the notches on all six
tumblers line up, two small springs push the side bar into the notches, allowing the
cylinder to turn in the cylinder bore. Five types of tumblers are used in making the lock
combinations, and each is coded and stamped with a number between 1 and 5.
Assembling and Coding Ignition Lock Cylinders
Tools Required
J 41340 Ignition Lock Holding Fixture
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1. Determine the tumbler numbers/arrangement:
1. Place the tip of the key directly over the tip of the illustrated key.
2. Inspect that the diagram outlines the key.
3. Starting with position 1 (open end of cylinder), find and record the
lowest level (tumbler number) that is visible.
4. Repeat the previous step for positions 210.
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2. Starting with position 1, insert the tumblers (4) into their corresponding slots in
the coded order.
3. Using your fingers, pull out the side bar (3) until the tumblers fall completely
into place.
4. Insert one tumbler spring (2) above each tumbler (4).
5. Lubricate the tumblers using Superlube GM P/N 12346241 or equivalent.
6. Insert the spring retainer (1) prongs into the slots at the end of each cylinder.
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7. Press down the retainer (1) until fully seated in the depression.
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8. Inspect for proper tumbler installation:
1. Hold the spring retainer (2) in position.
2. Insert the key (1) into the cylinder.
3. The side bar (3) should drop down flush with the cylinder diameter if
properly installed.
4. Disassemble and assemble properly as needed.
9. Remove the key.
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10. Secure the cylinder in the J 41340 .
1. Inspect that the spring retainer is facing up and positioned directly under
the punch slots.
2. Push the cylinder into the J 41340 until butted with the cylinder bezel.
3. Tighten the holding screw.
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11. Stake the bezel end of the retainer in place:
1. Hold the flat side of the punch, part of J 41340 , squarely against the face
of the cylinder bezel.
2. Stake the lock cylinder metal over the retainer corners.
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12. Stake the other end of the retainer:
1. Remove the punch, part of J 41340 .
2. Rotate the punch, part of J 41340 , 180 degrees.
3. Hold the punch, part of J 41340 , squarely against the end of the punch
slot on J 41340 .
4. Stake the metal over the other end of the retainer.
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13. Loosen the holding screw.
14. Remove the cylinder from the J 41340 .
15. Inspect that the retainer is properly staked. Restake as needed.
16. Lubricate the cylinder retainer slot.
17. Insert the following parts into the cylinder retainer slot:
o The retainer spring (2)
o The retainer (3)
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Important: Use a paste type grease, not a spray, for the following step.
18. Lubricate the following parts with GM P/N 12345996 or equivalent as needed:
o The detent pins (1)
o The cylinder retainer (3)
Fastener Tightening Specifications
Document ID: 450026
Specification
Application Metric English
Accelerator Control Cable Bracket Nut 12 N-m 106 lb in
Accelerator Control Cable and Cruise Control Cable Bracket Nut 9 N-m 80 lb in
Accelerator Control Cable Bracket Stud to Intake Manifold 6 N-m 53 lb in
Accelerator Control Cable Bracket Stud to Throttle Body 12 N-m 106 lb in
Air Cleaner Adapter Stud 8 N-m 71 lb in
Air Conditioning (A/C) Compressor Mounting Bolt 50 N-m 37 lb ft
Balance Shaft Driven Gear Bolt
First Pass 20 N-m 15 lb ft
Final Pass 35 degrees
Balance Shaft Retainer Bolt 12 N-m 106 lb in
Battery Negative Cable Bolt to Engine 35 N-m 26 lb ft
Belt Idler Pulley Bolt 50 N-m 37 lb ft
Camshaft Retainer Bolt 12 N-m 106 lb in
Camshaft Sprocket Bolt 25 N-m 18 lb ft
Connecting Rod Nut
First Pass 27 N-m 20 lb ft
Final Pass 70 degrees
Crankshaft Balancer Bolt 95 N-m 70 lb ft
Crankshaft Bearing Cap Bolt (Preferred Method)
First Pass 20 N-m 15 lb ft
Final Pass 73 degrees
Crankshaft Bearing Cap Bolt (Optional Strategy) 105 N-
m 77 lb ft
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Crankshaft Position Sensor Bolt 9 N-m 80 lb in
Crankshaft Pulley Bolt 58 N-m 43 lb ft
Crankshaft Rear Oil Seal Housing Bolt and Nut 12 N-m 106 lb in
Crankshaft Rear Oil Seal Housing Retainer Stud 6 N-m 53 lb in
Cylinder Head Bolt (Preferred Method)
All Bolts First Pass in Sequence 30 N-m 22 lb ft
Long Bolt Final Pass in Sequence 75 degrees
Medium Bolt Final Pass in Sequence 65 degrees
Short Bolt Final Pass in Sequence 55 degrees
Cylinder Head Bolt (Optional On-Vehicle Strategy)
First Pass in Sequence 35 N-m 26 lb ft
Second Pass in Sequence 60 N-m 44 lb ft
Final Pass in Sequence 90 N-m 66 lb ft
Cylinder Head Core Hole Plug 20 N-m 15 lb ft
Distributor Cap Bolt 2.4 N-
m
21 lb in
Distributor Clamp Bolt 25 N-m 18 lb ft
Drive Belt Tensioner Bolt 50 N-m 37 lb ft
EGR Valve Bolt
First Pass 7 N-m 62 lb in
Final Pass 30 N-m 22 lb ft
EGR Valve Inlet Pipe Clamp Bolt 25 N-m 18 lb ft
EGR Valve Inlet Pipe Nut at Intake Manifold 25 N-m 18 lb ft
EGR Valve Inlet Pipe Nut at Exhaust Manifold 30 N-m 22 lb ft
Engine Block Left Side Oil Gallery Plug 20 N-m 15 lb ft
Engine Block Left Rear Oil Gallery Plug 30 N-m 22 lb ft
Engine Block Right Rear Oil Gallery Plug 20 N-m 15 lb ft
Engine Block Coolant Drain Hole Plug 20 N-m 15 lb ft
Engine Block Oil Gallery Plug 20 N-m 15 lb ft
Engine Coolant Heater Bolt/Screw 2 N-m 18 lb in
Engine Coolant Temperature (ECT) Sensor 20 N-m 15 lb ft
Engine Flywheel Bolt 100 N-
m
74 lb ft
Engine Front Cover Bolt 12 N-m 106 lb in
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Engine Lift Bracket Bolt (Special Tool J 41427) 15 N-m 11 lb ft
Engine Lift Front Bracket Stud 35 N-m 26 lb ft
Engine Mount Bolt (Through-bolt) 74 N-m 55 lb ft
Engine Mount Bolt to Engine 54 N-m 40 lb ft
Engine Mount (Rear) Bolt to Transmission 50 N-m 37 lb ft
Engine Mount (Rear) Nut to Crossmember 45 N-m 33 lb ft
Engine Mount Bracket Bolt to Frame 45 N-m 33 lb ft
Engine Mount Nut (Through-bolt) 63 N-m 46 lb ft
Engine Oil Pressure Gauge Sensor 30 N-m 22 lb ft
Engine Oil Pressure Gauge Sensor Fitting (Plus Required Angle) 15 N-m 11 lb ft
Engine Wiring Harness Bracket Nut to Intake Manifold 12 N-m 106 lb in
Engine Wiring Harness Bracket Bolt to Rear of Cylinder Head 35 N-m 26 lb ft
Engine Wiring Harness Bracket Bolt to Generator and Drive Belt
Tensioner Bracket
25 N-m 18 lb ft
Evaporative Emission (EVAP) Canister Purge Solenoid Valve
Stud to Intake Manifold 10 N-m 88 lb in
Exhaust Manifold Bolt/Stud
First Pass 15 N-m 11 lb ft
Final Pass 30 N-m 22 lb ft
Fan and Water Pump Pulley Bolt 25 N-m 18 lb ft
Fuel Meter Body Bracket Bolt 10 N-m 88 lb in
Fuel Pipe Bracket Bolt 6 N-m 53 lb in
Fuel Pipe Bracket Bolt to Rear of Cylinder Head 30 N-m 22 lb ft
Fuel Pipe Retainer Nut 3 N-m 27 lb in
Fuel Supply Pipe Nut (Fuel Tank Side) 30 N-m 22 lb ft
Generator and Drive Belt Tensioner Bracket Bolt to Engine 41 N-m 30 lb ft
Generator and Drive Belt Tensioner Bracket Stud to Engine 20 N-m 15 lb ft
Generator and Drive Belt Tensioner Bracket Stud Nut 41 N-m 30 lb ft
Generator Mounting Bolt 50 N-m 37 lb ft
Ground Wire Bolt to Rear of Cylinder Head 35 N-m 26 lb ft
Ignition Coil Stud 12 N-m 106 lb in
Knock Sensor 20 N-m 15 lb ft
Lower Intake Manifold Bolt
First Pass in Sequence 3 N-m 27 lb in
Second Pass in Sequence 12 N-m 106 lb in
Final Pass in Sequence 15 N-m 11 lb ft
Oil Filter Adapter Bolt 21 N-m 15 lb ft
Oil Filter Fitting 35 N-m 26 lb ft
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Oil Level Indicator Tube Bolt 12 N-m 106 lb in
Oil Pan Baffle Bolt 12 N-m 106 lb in
Oil Pan Bolt and Nut in Sequence 25 N-m 18 lb ft
Oil Pan Drain Plug 25 N-m 18 lb ft
Oil Pump Bolt to Rear Crankshaft Bearing Cap 90 N-m 66 lb ft
Oil Pump Cover Bolt 12 N-m 106 lb in
Power Steering Fluid Reservoir Filler Neck Bolt to Power
Steering Pump Bracket
20 N-m 15 lb ft
Power Steering Pump Bracket Bolt to Engine 41 N-m 30 lb ft
Power Steering Pump Bracket Stud to Engine 20 N-m 15 lb ft
Power Steering Pump Bracket Stud Nut 41 N-m 30 lb ft
Power Steering Pump Bolt 50 N-m 37 lb ft
Power Steering Pump Nut to Engine 41 N-m 30 lb ft
Power Steering Pump Rear Bracket Nut to Power Steering Pump 50 N-m 37 lb ft
Radiator Inlet Hose Support Bracket Nut to Exhaust Manifold
Stud
36 N-m 27 lb ft
Remote Oil Filter Adapter Mounting Bracket Bolt 30 N-m 22 lb ft
Remote Oil Filter Adapter Nut 25 N-m 18 lb ft
Remote Oil Filter Inlet and Outlet Hose Clip Bolt 10 N-m 88 lb in
Remote Oil Filter Inlet and Outlet Hose to Remote Oil Filter
Adapter Bolt 35 N-m 26 lb ft
Remote Oil Filter Inlet and Outlet Hose to Remote Oil Filter Pipe
Adapter Bolt 35 N-m 26 lb ft
Secondary Air Injection (AIR) Check Valve Pipe Bracket Bolt to
Exhaust Manifold 10 N-m 88 lb in
Secondary Air Injection (AIR) Check Valve Pipe Stud Nut 25 N-m 18 lb ft
Spark Plug
Initial Installation (NEW Cylinder Head) 30 N-m 22 lb ft
All Subsequent Installations 15 N-m 11 lb ft
Spark Plug Wire Support Bolt 12 N-m 106 lb in
Starter Motor Bolt 40 N-m 29 lb ft
Starter Motor Wiring Harness/Transmission Cooler Pipe Bracket
Bolt to Oil Pan 12 N-m 106 lb in
Throttle Body Stud 9 N-m 80 lb in
Transmission Bolt to Oil Pan 47 N-m 35 lb ft
Transmission Cover Bolt 12 N-m 106 lb in
Upper Intake Manifold Stud
First Pass 5 N-m 44 lb in
Final Pass 9 N-m 80 lb in
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Valve Lifter Pushrod Guide Bolt 16 N-m 12 lb ft
Valve Rocker Arm Ball Stud 47 N-m 35 lb ft
Valve Rocker Arm Cover Bolt 12 N-m 106 lb in
Valve Rocker Arm Nut 25 N-m 18 lb ft
Water Outlet Stud 25 N-m 18 lb ft
Water Pump Bolt 45 N-m 33 lb ft
Engine Mechanical Specifications
Document ID: 104659
Specification
Application Metric English
General Data
Engine Type V6
Regular Production Option (RPO) Code LF6 VIN Code X, and RPO Code
L35 VIN Code W
Displacement 4.3L 262 CID
Bore 101.60 mm 4.012 in
Stroke 88.39 mm 3.480 in
Compression Ratio 9.2:1
Firing Order 165432
Spark Plug Gap 1.52 mm 0.060 in
Oil Pressure (Minimum) at Normal
Operating Temperature
42 kPa at
1,000 RPM
125 kPa at
2,000 RPM
166 kPa at
4,000 RPM
6 psig at
1,000 RPM
18 psig at
2,000 RPM
24 psig at
4,000 RPM
Balance Shaft
Rear Bearing Journal Clearance 0.0500.088 mm
0.0020
0.0035 in
Rear Bearing Journal Diameter 38.085
38.100 mm 1.49941.500 in
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Camshaft
End Play 0.0254
0.2286 mm
0.0010
0.0090 in
Journal Diameter 47.440
47.490 mm
1.8677
1.8696 in
Journal Diameter Out-of-Round 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Lobe Lift (Exhaust) (L35) 7.207.30 mm 0.2830.287 in
Lobe Lift (Exhaust) (LF6) 6.546.64 mm 0.2570.261 in
Lobe Lift (Intake) (L35) 6.977.07 mm 0.2740.278 in
Lobe Lift (Intake) (LF6) 6.766.86 mm 0.2660.270 in
Runout 0.065 mm 0.0026 in
Connecting Rod
Connecting Rod Bearing Clearance
(Production) 0.0380.078 mm 0.0015
0.0031 in
Connecting Rod Bearing Clearance
(Service) 0.0250.076 mm 0.0010
0.0030 in
Connecting Rod Side Clearance 0.150.44 mm 0.0060.017 in
Connecting Rod Journal Diameter 57.116
57.148 mm
2.2487
2.2497 in
Connecting Rod Journal Taper
(Production) 0.00508 mm
(Maximum)
0.00030 in
(Maximum)
Connecting Rod Journal Taper (Service) 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Connecting Rod Journal Out-of-Round
(Production) 0.007 mm
(Maximum)
0.0002 in
(Maximum)
Connecting Rod Journal Out-of-Round
(Service) 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Crankshaft
Crankshaft Bearing Clearance (Journal
#1Production) 0.020.508 mm 0.0008
0.0020 in
Crankshaft Bearing Clearance (Journal
#2, #3, and #4Production) 0.0280.058 mm 0.0011
0.0023 in
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Crankshaft Bearing Clearance (Journal
#1Service) 0.02540.05 mm 0.0010
0.0020 in
Crankshaft Bearing Clearance (Journal
#2, #3, and #4Service) 0.0250.063 mm 0.0010
0.0250 in
Crankshaft End Play 0.0500.20 mm 0.0020.008 in
Crankshaft Journal Diameter (Journal
#1) 62.199
62.217 mm
2.4488
2.4495 in
Crankshaft Journal Diameter (Journal
#2 and #3) 62.191
62.215 mm
2.4485
2.4494 in
Crankshaft Journal Diameter (Journal
#4) 62.179
62.203 mm
2.4480
2.4489 in
Crankshaft Journal Out-of-Round
(Production) 0.005 mm
(Maximum)
0.0002 in
(Maximum)
Crankshaft Journal Out-of-Round
(Service) 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Crankshaft Journal Taper (Production) 0.007 mm
(Maximum)
0.0003 in
(Maximum)
Crankshaft Runout 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Cylinder Bore
Diameter 101.618
101.643 mm
4.0007
4.0017 in
Out-of-Round (Production) 0.0127 mm
(Maximum)
0.00050 in
(Maximum)
Out-of-Round (Service) 0.05 mm
(Maximum)
0.002 in
(Maximum)
Taper (Production Relief Side) 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Taper (Production Thrust Side) 0.012 mm
(Maximum)
0.0005 in
(Maximum)
Taper (Service) 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Cylinder Head
Surface Flatness 0.10 mm
(Maximum)
0.004 in
(Maximum)
Exhaust Manifold
Surface Flatness 0.05 mm
(Maximum)
0.002 in
(Maximum)
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Intake Manifold
Surface Flatness 0.10 mm
(Maximum)
0.004 in
(Maximum)
Oil Pan
Oil Pan Alignment at Rear of Engine
Block 0.3 mm
(Maximum)
0.011 in
(Maximum)
Piston
Piston Bore Clearance (Production) 0.0180.061 mm
0.0007
0.0024 in
Piston Bore Clearance (Service) 0.075 mm
(Maximum)
0.0029 mm
(Maximum)
Piston Pin
Clearance in Piston (Production) 0.0130.023 mm
0.0005
0.0009 in
Clearance in Piston (Service) 0.025 mm
(Maximum)
0.0010 in
(Maximum)
Diameter 23.545
23.548 mm
0.9270
0.9270 in
Fit in Connecting Rod 0.0210.040 mm
(Interference)
0.0008
0.0016 in
(Interference)
Piston Rings (End Gap Measured in Cylinder Bore)
Piston Compression Ring Gap
(ProductionTop Groove) 0.250.40 mm 0.0100.016 in
Piston Compression Ring Gap
(Production2nd Groove) 0.460.66 mm
(Maximum)
0.0180.026 in
(Maximum)
Piston Compression Ring Gap (Service
Top Groove) 0.5 mm
(Maximum)
0.19 in
(Maximum)
Piston Compression Ring Gap (Service
2nd Groove) 0.8 mm
(Maximum)
0.31 in
(Maximum)
Piston Compression Ring Groove
Clearance (ProductionTop Groove) 0.0300.070 mm 0.0012
0.0027 in
Piston Compression Ring Groove
Clearance (Production2nd Groove) 0.0400.080 mm 0.0015
0.0031 in
Piston Compression Ring Groove
Clearance (Service) 0.085 mm
(Maximum)
0.0033 in
(Maximum)
Piston Oil Ring Gap (Production) 0.250.76 mm 0.0100.029 in
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Piston Oil Ring Gap (Service) 0.90 mm
(Maximum)
0.035 in
(Maximum)
Piston Oil Ring Groove Clearance
(Production) 0.0460.096 mm 0.0018
0.0037 in
Piston Oil Ring Groove Clearance
(Service) 0.10 mm
(Maximum)
0.0039 in
(Maximum)
Valve System
Valve Face Angle 45 degrees
Valve Head Edge Margin 0.79 mm
(Minimum)
0.031 in
(Minimum)
Valve Lash Net LashNo Adjustment
Valve Lift (Exhaust) (L35) 10.879 mm 0.4280 in
Valve Lift (Exhaust) (LF6) 9.887 mm 0.3890 in
Valve Lift (Intake) (L35) 10.527 mm 0.4140 in
Valve Lift (Intake) (LF6) 10.215 mm 0.4020 in
Valve Lifter Hydraulic Roller
Valve Rocker Arm Ratio 1.5:1
Valve Seat Angle 46 degrees
Valve Seat Runout 0.05 mm
(Maximum)
0.002 in
(Maximum)
Valve Seat Width (Exhaust) 1.5752.362 mm 0.0650.098 in
Valve Seat Width (Intake) 0.891.52 mm 0.0350.060 in
Valve Spring Free Length 51.3 mm 2.02 in
Valve Spring Installed Height (Exhaust) 42.9243.43 mm 1.6701.700 in
Valve Spring Installed Height (Intake) 42.9243.43 mm 1.6701.700 in
Valve Spring Pressure (Closed) 338374 N at
43.2 mm
7684 lb at
1.70 in
Valve Spring Pressure (Open) 832903 N at
32.3 mm
187203 lb at
1.27 in
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Valve Stem Clearance (Exhaust
Production) 0.0250.069 mm 0.0010
0.0027 in
Valve Stem Clearance (Exhaust
Service) 0.0250.094 mm 0.0010
0.0037 in
Valve Stem Clearance (Intake
Production) 0.0250.069 mm 0.0010
0.0027 in
Valve Stem Clearance (IntakeService) 0.0250.094 mm
0.0010
0.0037 in
Valve Stem Oil Seal Installed Height
(Measured from the Top of the Large
Diameter Valve Guide Bevel to the
Bottom of the Valve Stem Oil Seal)
12 mm 0.03937
0.07874 in
Oil Pressure Diagnosis and Testing
Document ID: 23360
1. With the vehicle on a level surface, allow adequate drain down time, 2
3 minutes, and measure for a low engine oil level.
Add the recommended grade engine oil, and fill the crankcase until the oil level
measures FULL on the oil level indicator.
2. Operate the engine and verify low or no oil pressure on the vehicle oil pressure
gage or the oil indicator light.
Listen for a noisy valve train or a knocking noise.
3. Inspect for the following:
o Engine oil diluted by moisture or unburned fuel mixtures
o Improper engine oil viscosity for the expected temperature
o Incorrect or faulty oil pressure gage sensor
o Incorrect or faulty oil pressure gage
o Plugged oil filter
o Malfunctioning oil filter bypass valve
4. Remove the oil pressure gage sensor or another engine block oil gallery plug.
5. Install an oil pressure gage.
6. Start the engine and then allow the engine to reach normal operation
temperature.
7. Measure the engine oil pressure at the following RPM:
Specification
1. 42 kPa (6 psig) minimum, at 1,000 RPM
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2. 125 kPa (18 psig) minimum, at 2,000 RPM
3. 166 kPa (24 psig) minimum, at 4,000 RPM
8. If the engine oil pressure is below minimum specifications, inspect the engine
for one or more of the following:
o Oil pump worn or dirty
o Malfunctioning oil pump pressure relief valve
o Oil pump screen loose, plugged, or damaged
o Excessive bearing clearance
o Cracked, porous or restricted oil galleries
o Engine block oil gallery plugs missing or incorrectly installed
o Broken valve lifters
Checks Action
Engine performance diagnosis procedures are covered in Engine Controls and
should be consulted for diagnosis of any Driveability, Emissions, or
Malfunctioning Indicator Lamp (MIL) concerns.
The following diagnosis covers common concerns and possible causes.
When the proper diagnosis is made, the concern should be corrected by adjustment,
repair or replacement as required.
Refer to the appropriate section of the service manual for each specific procedure.
This diagnostic table will assist in engine misfire diagnosis due to a mechanical
concern such as a faulty engine camshaft, worn or damaged bearings or bent valve
pushrod.
This table will not isolate a crossed fuel injector wire, faulty fuel injector or any
other driveability component failure that may cause a misfire.
The Powertrain On-Board Diagnostic System checks must be performed first.
When using this table to make a Base Engine Misfire diagnosis, begin with the
preliminary information below and then proceed to the specific category.
Preliminary 1. Perform DTC P0300 before proceeding with Base
Engine Misfire Diagnosis information.
DTC P0300 will assist in determining which cylinder or
cylinders are misfiring.
2. Perform a visual inspection of the following:
o A loose or improperly installed engine flywheel
or crankshaft balancer
o Worn, damaged or misaligned accessory drive
system components
3. Listen to the engine for any abnormal internal engine
noises.
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4. Inspect the engine for acceptable oil pressure.
5. Verify if the engine has excessive oil consumption.
6. Verify if the engine has excessive coolant consumption.
7. Perform a compression test on the engine.
Intake Manifold
Leaks
An intake manifold that has a vacuum leak may cause a
misfire.
Inspect for the following:
Improperly installed or damaged vacuum hoses
Faulty or improperly installed lower intake manifold
and/or gaskets
Cracked or damaged lower intake manifold
Improperly installed MAP sensor
The sealing grommet of the MAP sensor should not be
torn or damaged
Improperly installed throttle body or damaged gasket
Warped intake manifold
Warped or damaged cylinder head sealing surface
Coolant
Consumption
Coolant consumption may or may not cause the engine to
overheat.
Inspect for the following:
External coolant leaks
Faulty cylinder head gasket
Warped cylinder head
Cracked cylinder head
Damaged engine block
Oil Consumption Oil consumption may or may not cause the engine to misfire.
1. Remove the spark plugs and inspect for an oil fouled
spark plug.
2. Perform a cylinder compression test.
3. If the compression test indicates worn valves or valve
guides, inspect the following:
o Worn, brittle, or improperly installed valve stem
oil seals
o Worn valve guides
o Worn valve stems
o Worn or burnt valves or valve seats
4. If the compression test indicates worn or damaged
piston rings, inspect the following:
o Broken or improperly seated piston rings
o Excessive piston ring end gap
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o Excessive cylinder bore wear or taper
o Cylinder damage
o Piston damage
Abnormal Internal
Engine Noises
1. Start the engine and determine if the noise is timed to
the engine camshaft speed or the crankshaft speed.
2. Using a timing light, two knocks per flash is the
crankshaft speed and one knock per flash is the engine
camshaft speed.
3. If the noise is timed to the engine camshaft speed,
inspect the following:
o Missing or loose valve train components
o Worn or loose valve rocker arms
o Worn or bent valve pushrods
o Faulty valve springs
o Bent or burnt valves
o Worn engine camshaft lobes
o Worn or damaged camshaft timing chain and/or
sprockets
Important: A slight COLD knock or piston slapping
noise could be considered normal if not present after the
engine has reached normal operating temperatures.
4. If the knock is timed to the crankshaft speed, inspect the
following:
o Worn crankshaft or connecting rod bearings
o Piston or cylinder damage
o Worn piston or piston pin
o Faulty connecting rod
o Excessive carbon build-up on the top of the
piston
No Abnormal
Internal Engine
Noise
1. Inspect for a worn or improperly installed camshaft
timing chain and/or sprockets.
2. Remove the valve rocker arm cover on the side of the
engine with the cylinder that is misfiring.
3. Inspect for the following:
o Loose valve rocker arm studs
o Bent valve push rods
o Faulty valve springs
o Faulty valve lifters (bleeding down)
o Worn or improperly seated valves
o Worn engine camshaft lobes
Engine Compression Test
Document ID: 723193
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1. Ensure that the vehicle batteries are in good condition, and fully charged.
2. Operate the vehicle until the engine is at normal operating temperature.
3. Disconnect the positive ignition coil wire plug from the ignition coil.
4. Disconnect the fuel injector electrical connector.
5. Remove all of the spark plugs.
Notice: Do not insert objects into the throttle plate opening. Damage to the
throttle body can result, requiring replacement of the throttle body assembly.
6. Block the throttle linkage wide open.
7. Install the engine cylinder compression gage to the cylinder being tested.
8. Using the vehicle starter motor, rotate, or crank the engine for 4 compression
strokes, or puffs, for the cylinder being tested. If the engine rotates for more than
4 compression strokes, test the cylinder again.
9. Record the compression reading.
10. Remove the engine cylinder compression gage from the cylinder being tested.
11. Repeat steps 811 for each additional cylinder. All cylinders must be tested to
obtain valid test results.
12. If any cylinders have low compression, inject approximately 15 ml (1 oz) of
engine oil into the cylinder through the spark plug hole.
13. Repeat steps 811 for all low compression cylinders.
14. The minimum compression in any one cylinder should not be less than
70 percent of the highest cylinder. No cylinder should read less than 690 kpa
(100 psi). For example, if the highest pressure in any one cylinder is 1035 kPa
(150 psi), the lowest allowable pressure for any other cylinder would be 725 kPa
(105 psi). Multiply the highest cylinder pressure by 70 percent, 1035 kPa x
70 percent = 725 kPa (150 psi x 70 percent = 105 psi), in order to determine the
lowest allowable pressure in any other cylinder.
o Normal
The compression builds up quickly and evenly to the specified
compression.
o Piston rings leaking
Compression is low on the first compression stroke. The compression
builds up on the following strokes, but does not reach normal.
Compression improves considerably when you add oil.
o Valves leaking
Compression is low on the first compression stroke. The compression
does not build up on the following strokes, and does not reach normal.
Compression does not improve much, if at all, when you add oil.
o Head gasket leaking
Compression is low on the first stroke. The compression does not build
up on the following strokes, and does not reach normal. Compression
does not improve much, if at all, when you add oil. Adjacent cylinders
have the same, or similar, low compression readings.
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15. If one or more cylinders fails to meet the minimum specified compression,
repair or replace all damaged or worn components and test the engine again.
Lower Engine View 2 4.3L L35/LF6 -
Document ID: 41408
Lower Engine View 2
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1. Crankshaft Rear Oil Seal Housing Bolt
2. Flywheel Locator Pin
3. Crankshaft Rear Oil Seal Housing Nut
4. Crankshaft Rear Oil Seal Housing
5. Crankshaft Rear Oil Seal Housing Retainer Stud
6. Crankshaft Rear Oil Seal Housing Gasket
7. Crankshaft
8. Oil Pump Drive Shaft
9. Oil Pump Locator Pin
10. Oil Pump Drive Shaft Retainer
11. Oil Pump
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12. Oil Pump Bolt
13. Oil Pan
14. Oil Pan Bolt
15. Oil Pan Gasket
16. Crankshaft Bearing Cap Bolt
17. Crankshaft Bearing Cap
18. Crankshaft Bearings (Lower)
19. Crankshaft Sprocket
20. Crankshaft Position Sensor Reluctor Ring
21. Engine Front Cover
22. Crankshaft Front Oil Seal
23. Crankshaft Balancer
24. Crankshaft Balancer Bolt
25. Crankshaft Balancer Key
26. Crankshaft Bearings (Upper)
Upper Engine View 2 4.3L L35/LF6 (ST, GMT150) -
Document ID: 41410
Upper Engine View 2
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1. Valve Rocker Arm Cover
2. Valve Rocker Arm Cover Gasket
3. Valve Rocker Arm Nut
4. Valve Rocker Arm Ball
5. Valve Rocker Arm
6. Spark Plug Wire Support
7. Spark Plug Wire Support Bolt
8. Exhaust Manifold Gasket
9. Exhaust Manifold
10. Exhaust Manifold Bolt
11. Spark Plug Wire Shields
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12. Exhaust Manifold Gasket
13. Valve Lifter
14. Valve Lifter Pushrod Guide
15. Valve Pushrod
16. Cylinder Head Gasket
17. Engine Lift Front Bracket
18. Cylinder Head Bolt
19. Cylinder Head
Upper and Lower Intake Manifold View 4.3L L35/LF6 -
Document ID: 356346
Upper and Lower Intake Manifold View
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1. Fuel Pipe Retainer Bracket Nut
2. Fuel Pipe Retainer
3. Fuel Pipe
4. Fuel Pipe Bolt
5. Fuel Seal Retainer
6. Upper Fuel Seal (Yellow O-ring)
7. Spacer Ring (Metal Flat Washer)
8. Lower Fuel Seal (Black O-ring)
9. Upper Manifold Attaching Stud
10. Upper Intake Manifold
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11. Upper Intake to Lower Intake Manifold Gasket
12. Fuel Meter Body Seal (O-ring)
13. Fuel Meter Body
14. Intake Manifold
15. Throttle Body to Upper Intake Manifold Gasket
16. Throttle Body
17. Throttle Body Attaching Stud
Intake Manifold Replacement -
Document ID: 193909
Removal Procedure
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1. Disconnect the PCV tube from the air cleaner outlet duct.
2. Remove the air cleaner outlet duct from the throttle body.
3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement
in Engine Controls.
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4. Disconnect the following electrical connectors:
o The A/C pressure switch, if equipped
o The throttle position (TP) sensor
o The idle air control (IAC) motor
o The fuel meter body assembly connector
o The manifold absolute pressure (MAP) sensor
o The EVAP canister purge solenoid valve
5. Remove the EVAP canister purge solenoid valve. Refer to EVAP Canister
Purge Solenoid Valve Replacement in Engine Controls.
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6. Disconnect the vacuum hose from the intake manifold, if equipped with A/C.
7. Remove the vacuum brake booster hose.
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8. Remove the PCV valve hose assembly form the intake manifold and the valve
rocker arm cover.
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9. Disconnect the accelerator control cable from the throttle shaft and the
accelerator cable bracket. Refer to Accelerator Control Cable Replacement in
Engine Controls.
10. Disconnect the cruise control cable, if equipped from the throttle shaft and the
accelerator cable bracket. Refer to Cruise Control Cable Replacement in Cruise
Control.
11. Remove the accelerator cable bracket from the throttle body and the intake
manifold.
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12. Remove the accelerator and cruise control cable bracket from the throttle body.
Leave the accelerator and cruise control cables and the engine wiring harness on
the bracket.
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13. Remove the bracket for the engine wiring harness from the intake stud.
14. Remove the fuel lines from the fuel meter body assembly. Refer to Fuel
Hose/Pipes Replacement - Engine Compartment in Engine Controls.
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15. Remove the upper intake manifold. Refer to Intake Manifold Disassemble in
Engine Mechanical - 4.3L
16. Clean all sealing surfaces. Refer to Intake Manifold Cleaning and Inspection in
Engine Mechanical - 4.3L
Installation Procedure
Click here for full size
1. Install the upper intake manifold. Refer to Intake Manifold Assemble in Engine
Mechanical - 4.3L
2. Install the fuel lines to the fuel meter body assembly. Refer to Fuel Hose/Pipes
Replacement - Engine Compartment in Engine Controls.
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Click here for full size
3. Install the bracket for the engine wiring harness on the lower intake manifold
stud.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or corrosion
inhibitors on fasteners or fastener joint surfaces unless specified. These coatings
affect fastener torque and joint clamping force and may damage the fastener.
Use the correct tightening sequence and specifications when installing fasteners
in order to avoid damage to parts and systems.
4. Install the engine wiring harness bracket nut.
Tighten
Tighten the engine wiring harness bracket nut to 12 N-m (106 lb in).
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5. Install the accelerator and cruise control cable bracket to the throttle body.
6. Install the accelerator and cruise control cable bracket nuts.
Tighten
Tighten the accelerator and cruise control cable bracket nuts to 9 N-m (80 lb in).
Click here for full size
7. Install the accelerator cable bracket to the throttle body and the intake manifold.
Tighten
Tighten the accelerator cable bracket studs and nuts to 12 N-m (106 lb in).
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8. Install the cruise control cable, if equipped to the throttle shaft and the bracket.
Refer to Cruise Control Cable Replacement in Cruise Controls.
9. Install the accelerator cable to the throttle shaft and the bracket. Refer to
Accelerator Control Cable Replacement in Engine Controls - 4.3L Engine
Controls.
10. Install the EVAP canister purge solenoid valve. Refer to EVAP Canister Purge
Solenoid Valve Replacement in Engine Controls.
Click here for full size
11. Connect the PCV valve hose assembly to the intake manifold and the valve
rocker arm cover.
Click here for full size
12. Connect the vacuum hose to the intake manifold, if equipped with A/C.
13. Install the vacuum brake booster hose to the intake manifold.
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14. Connect the following electrical connectors:
o The A/C pressure switch, if equipped
o The throttle position (TP) sensor
o The idle air control (IAC) motor
o The fuel meter body assembly connector
o The manifold absolute pressure (MAP) sensor
o The EVAP canister purge solenoid valve
Click here for full size
15. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in
Engine Controls.
16. Install the air cleaner outlet duct to the throttle body assembly.
17. Connect the PCV tube to the air cleaner outlet duct.
Intake Manifold Replacement -
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Document ID: 193927
Removal Procedure
Click here for full size
1. Disconnect the battery negative cable. Refer to Battery Replacement in Engine
Electrical.
2. Disconnect the PCV tube from the air cleaner outlet duct.
3. Remove the air cleaner outlet duct from the throttle body.
4. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement
in Engine Controls.
Click here for full size
5. Drain the cooling system. Refer to Cooling System Draining and Filling in
Engine Cooling.
6. Remove the radiator inlet hose at the water outlet.
7. Remove the heater hose from the intake manifold.
8. Remove the water pump inlet hose form the intake manifold.
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9. Disconnect the accelerator control cable from the throttle shaft and the
accelerator cable bracket. Refer to Accelerator Control Cable Replacement in
Engine Controls.
10. Disconnect the cruise control cable, if equipped from the throttle shaft and the
accelerator cable bracket. Refer to Cruise Control Cable Replacement in Cruise
Control.
11. Remove the accelerator cable bracket from the throttle body and the intake
manifold.
Click here for full size
12. Remove the accelerator and the cruise control cable bracket from the throttle
bracket.
Leave the accelerator and cruise control cables and the wiring harness on the
bracket.
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13. Remove the following electrical connectors:
o The fuel meter body assembly
o The EVAP canister purge solenoid valve
o The idle air control (IAC) motor
o The throttle position (TP) sensor
o The A/C compressor high pressure switch, if equipped
o The A/C clutch switch, if equipped
o The exhaust gas recirculation (EGR) valve
o The engine coolant temperature (ECT) sensor
o The ignition coil
o The ignition control module (ICM)
14. Remove the engine wiring harness from the retainers.
15. Move the engine wiring harness aside.
16. Remove the distributor. Refer to Distributor Replacement in Engine Electrical.
Click here for full size
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17. Remove the exhaust gas recirculation (EGR) valve inlet pipe from the intake and
exhaust manifold.
18. Disconnect the fuel supply and return pipes at the rear of the intake manifold.
Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine
Controls.
Click here for full size
19. Disconnect the vacuum hose from the intake manifold, if equipped with A/C.
20. Disconnect the vacuum brake booster hose
Click here for full size
21. Disconnect the PCV hose assembly from the intake manifold and the valve
rocker arm cover.
22. Remove the EVAP canister purge solenoid valve. Refer to EVAP Canister
Purge Solenoid Valve Replacement in Engine Controls.
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23. Important: Do not discharge the refrigerant.
Perform the following in order to remove the left front bolt for the intake
manifold:
1. Remove the drive belt. Refer to Drive Belt Replacement .
2. Loosen the nut for the power steering pump rear bracket at the side of the
engine.
3. Remove the nut for the power steering pump rear bracket at the front of
the engine.
4. Remove the bolts and the nut for the power steering pump mounting
bracket.
5. Leave the A/C compressor, if equipped, and the power steering pump on
the power steering pump mounting bracket.
6. Slide the power steering pump bracket forward to access the bolt at the
front of the intake manifold.
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24. Remove the lower intake manifold. Refer to Intake Manifold Removal .
25. Clean all sealing surfaces. Refer to Intake Manifold Cleaning and Inspection in
Engine Mechanical - 4.3L .
Installation Procedure
Click here for full size
1. Notice: Proper lower intake manifold fastener tightening sequence and torque is
critical. Always follow the tightening sequence, and torque the intake manifold
bolts using the 3 step method. Failing to do so may distort the crankshaft bearing
bore alignment and cause damage to the crankshaft bearings.
Install the lower intake manifold. Refer to Intake Manifold Installation .
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2. Position the power steering pump mounting bracket.
3. Loosely install the power steering pump mounting bracket bolts and nuts.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or corrosion
inhibitors on fasteners or fastener joint surfaces unless specified. These coatings
affect fastener torque and joint clamping force and may damage the fastener.
Use the correct tightening sequence and specifications when installing fasteners
in order to avoid damage to parts and systems.
4. Install the nut for the power steering pump rear bracket at the front of the engine.
Tighten
Tighten the power steering pump mounting bracket bolts and the power steering
pump rear bracket nuts to 41 N-m (30 lb ft).
5. Install the drive belt. Refer to Drive Belt Replacement .
6. Install the EVAP canister purge solenoid valve. Refer to EVAP Canister Purge
Solenoid Valve Replacement in Engine Controls.
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7. Connect the vacuum brake booster hose.
8. Connect the vacuum hose to the intake manifold, if equipped with A/C.
Click here for full size
9. Install the PCV hose assembly to the intake manifold and the valve rocker arm
cover.
10. Install the fuel supply and return pipes to the rear of the intake manifold. Refer
to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls.
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11. Install the exhaust gas recirculation (EGR) valve inlet pipe to the intake
manifold and the exhaust manifold.
Tighten
1. Tighten the EGR valve inlet pipe intake manifold nut to 25 N-m
(18 lb ft).
2. Tighten the EGR valve inlet pipe exhaust manifold nut to 30 N-m
(22 lb ft).
3. Tighten the EGR valve inlet pipe clamp bolt to 25 N-m (18 lb ft).
Click here for full size
12. Important: In order to install the distributor for the correct engine timing,
position the engine to number one cylinder top dead center.
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Remove the spark plug for number one cylinder.
13. Rotate the crankshaft until number one cylinder is in the compression stroke.
14. Align the two reference marks on the crankshaft balancer (1) and (4) with the
two alignment marks (2) and (3) on the front cover.
15. Install the spark plug. Refer to Spark Plug Replacement in Engine Electrical.
16. Install the distributor. Refer to Distributor Replacement in Engine Electrical.
Click here for full size
17. Position the engine wiring harness.
18. Install the engine wiring harness in the retainers.
19. Install the following electrical connectors:
o The fuel meter body assembly
o The EVAP canister purge solenoid valve
o The idle air control (IAC) motor
o The throttle position (TP) sensor
o The A/C compressor high pressure switch, if equipped.
o The A/C compressor clutch switch, if equipped.
o The exhaust gas recirculation (EGR) valve
o The engine coolant temperature (ECT) sensor
o The ignition coil
o The ignition control module (ICM)
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20. Install the accelerator cable and cruise control bracket to the throttle body.
Tighten
Tighten the accelerator cable and cruise control bracket nuts to 9 N-m (80 lb in).
Click here for full size
21. Install the accelerator cable bracket to the intake manifold and the throttle body.
Tighten
Tighten the accelerator cable bracket studs and nuts to 12 N-m (106 lb in).
22. Install the accelerator control cable to the bracket and the throttle shaft. Refer to
Accelerator Control Cable Replacement in Engine Controls.
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23. Install the cruise control cable, if equipped to the bracket and the throttle shaft.
Refer to Cruise Control Cable Replacement in Cruise Control.
Click here for full size
24. Install the water pump inlet hose to the intake manifold.
25. Install the heater hose to the intake manifold.
26. Install the radiator inlet hose to the water outlet. Refer to Radiator Replacement
in Engine Cooling.
27. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine
Cooling.
Click here for full size
28. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in
Engine Controls.
29. Install the air cleaner outlet duct to the throttle body.
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30. Connect the PCV tube to the air cleaner outlet duct.
31. Connect the battery negative cable. Refer to Battery Replacement in Engine
Electrical.
Valve Rocker Arm Cover Replacement -
Document ID: 193937
Removal Procedure
Click here for full size
1. Disconnect the PCV tube from the air cleaner outlet duct,
2. Remove the air cleaner outlet duct from the throttle body.
3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement
in Engine Controls.
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4. Remove the PCV valve hose assembly from the valve rocker arm cover.
5. Disconnect the engine coolant temperature (ECT) gauge sensor.
6. Partially drain the engine coolant. Refer to Cooling System Draining and Filling
in Engine Cooling.
7. Remove the radiator inlet hose from the water outlet. Refer to Engine Coolant
Thermostat Replacement in Engine Cooling.
Click here for full size
8. Remove the exhaust gas recirculation (EGR) valve inlet pipe from the intake
manifold and the exhaust manifold.
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9. Important: A/C compressor and bracket removal is not necessary.
Remove the bolts and the valve rocker arm cover.
10. Clean all sealing surfaces. Refer to Valve Rocker Arm Cover Cleaning and
Inspection in Engine Mechanical - 4.3L .
Installation Procedure
Click here for full size
1. Install the valve rocker arm cover and bolts. Refer to Valve Rocker Arm Cover
Installation .
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2. Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or corrosion
inhibitors on fasteners or fastener joint surfaces unless specified. These coatings
affect fastener torque and joint clamping force and may damage the fastener.
Use the correct tightening sequence and specifications when installing fasteners
in order to avoid damage to parts and systems.
Install the exhaust gas recirculation (EGR) valve inlet pipe into the intake and
exhaust manifolds.
Tighten
1. Tighten the EGR valve inlet pipe intake manifold nut to 25 N-m
(18 lb ft).
2. Tighten the EGR valve inlet pipe exhaust manifold nut to 30 N-m
(22 lb ft).
3. Tighten the EGR valve inlet pipe clamp bolt to 25 N-m (18 lb ft).
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3. Install the radiator inlet hose to the water outlet. Refer to Radiator Replacement
in Engine Cooling.
4. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine
Cooling.
5. Install the PCV valve hose assembly to the valve rocker arm cover.
6. Connect the ECT gauge sensor.
Click here for full size
7. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in
Engine Controls.
8. Install the air cleaner outlet duct to the throttle body.
9. Connect the PCV tube to the air cleaner outlet duct,
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Valve Rocker Arm Cover Replacement -
Document ID: 195305
Removal Procedure
Click here for full size
1. Remove the PCV tube from the air cleaner outlet duct and the valve rocker arm
cover.
2. Disconnect the spark plug wires from the spark plugs for the right side of the
engine. Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
3. Remove the EVAP canister purge solenoid valve. Refer to EVAP Canister
Purge Solenoid Valve Replacement in Engine Controls.
4. Unfasten the heater hose retainer above the valve rocker arm cover.
5. Move and secure the heater hoses aside.
Click here for full size
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6. Remove the bolt holding the engine wiring harness bracket to the generator.
7. Disconnect the crankcase position (CKP) sensor electrical connector.
8. Move and secure the engine wiring harness aside.
Click here for full size
9. Remove the bolts and the right valve rocker arm cover.
10. Clean all sealing surfaces. Refer to Valve Rocker Arm Cover Cleaning and
Inspection in Engine Mechanical - 4.3L .
Installation Procedure
Click here for full size
1. Install the right valve rocker arm cover and bolts. Refer to Valve Rocker Arm
Cover Installation .
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2. Position the engine wiring harness.
3. Connect the CKP sensor electrical connector.
Notice: Use the correct fastener in the correct location. Replacement fasteners
must be the correct part number for that application. Fasteners requiring
replacement or fasteners requiring the use of thread locking compound or sealant
are identified in the service procedure. Do not use paints, lubricants, or corrosion
inhibitors on fasteners or fastener joint surfaces unless specified. These coatings
affect fastener torque and joint clamping force and may damage the fastener.
Use the correct tightening sequence and specifications when installing fasteners
in order to avoid damage to parts and systems.
4. Install the engine wiring harness and bolt to the generator mounting bracket.
Tighten
Tighten the engine wiring harness bolt to 25 N-m (18 lb ft),
5. Position the heater hoses.
6. Install the heater hoses in the retainer above the valve rocker arm cover.
7. Install the EVAP canister purge solenoid valve. Refer to EVAP Canister Purge
Solenoid Valve Replacement in Engine Controls.
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8. Connect the spark plug wires to the spark plugs for the right side of the engine.
Refer to Spark Plug Wire Harness Replacement in Engine Electrical.
9. Install the PCV tube to the air cleaner outlet duct and the valve rocker arm
cover.
Valve Rocker Arm and Push Rod Replacement
Document ID: 194238
Removal Procedure
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1. Remove the valve rocker arm cover. Refer to Valve Rocker Arm Cover
Replacement in Engine Mechanical - 4.3L .
2. Remove the valve rocker arm nut, valve rocker arm with the valve rocker arm
ball . Refer to Valve Rocker Arm and Push Rod Removal in Engine Mechanical
- 4.3L .
3. Remove the valve pushrods.
4. Clean and inspect the valve rocker arms, valve rocker arm nuts, valve rocker
arm ball and the valve pushrods. Refer to Valve Rocker Arm and Push Rod
Cleaning and Inspection in Engine Mechanical - 4.3L
Installation Procedure
Click here for full size
1. Install the valve pushrods.
2. Install the valve rocker arm nut, valve rocker arm with the valve rocker arm ball.
Refer to Valve Rocker Arm and Push Rod Installation in Engine Mechanical -
4.3L .
3. Install the valve rocker arm cover. Refer to Valve Rocker Arm Cover
Replacement in Engine Mechanical - 4.3L .
Valve Stem Oil Seal and Valve Spring Replacement
Document ID: 195683
Removal Procedure
Tools Required
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J 22794 Spark Plug Port Adapter
J 38606 Valve Spring Compressor
J 5892-D Valve Spring Compressor
Click here for full size
1. Remove the valve rocker arms. Refer to Valve Rocker Arm and Push Rod
Replacement in Engine Mechanical - 4.3L .
2. Remove the spark plugs. Refer to Spark Plug Replacement in Engine Electrical.
Click here for full size
3. Install the J 22794 into the spark plug hole.
4. Apply compressed air in order to hold the valves in place.
5. Install a valve rocker arm nut.
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6. Use the J 5892-D in order to compress the valve spring.
Click here for full size
7. Notice: When using J 38606 ensure that the jaws are completely engaged on the
valve spring. If the jaws are not completely engaged the jaws may slip off and
scratch the valve spring. Replace the valve spring if the valve spring becomes
scratch.
Use J 38606 when J 5892-D will not fit.
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8. Remove the valve stem keys (1).
Carefully release the valve spring tension.
9. Remove the J 5892-D or the J 38606 .
10. Remove the valve spring cap (2) and the valve spring (3).
11. Remove the valve stem oil seal (4).
Installation Procedure
Tools Required
J 22794 Spark Plug Port Adapter
J 38606 Valve Spring Compressor
J 42073 Valve Stem Seal Installer
J 5892-D Valve Spring Compressor
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1. Important: The exhaust valve oil seal has the letters EX (1) molded into the top
of the seal. The seal material is brown in color (2) with a white stripe (3) painted
on the outside diameter of the seal or the material may be off-white in color (2)
with no paint stripe. The intake valve seal is black in color. The exhaust and
intake valve seals are not interchangeable.
Select the proper valve stem oil seal for the specific valve guide.
2. Lubricate the valve stem oil seal and the outside diameter of the valve guide
with clean engine oil.
3. Assemble the valve stem oil seal onto the valve guide using the J 42073 and a
hammer.
4. Install the valve stem oil seal onto the valve guide until the installation tool
bottoms against the valve spring seat.
Click here for full size
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5. Inspect the valve stem oil seal. The valve stem oil seal should not be bottomed
against the valve guide.
There should be a 1 2 mm (0.03937 0.07874 in) gap between the bottom edge
of the seal and the valve guide.
Click here for full size
6. Install the valve spring (3).
7. Install the valve spring cap (2) on the valve stem.
8. Compress the valve spring (3) using the J 5892-D
Click here for full size
9. Notice: When using J 38606 ensure that the jaws are completely engaged on the
valve spring. If the jaws are not completely engaged the jaws may slip off and
scratch the valve spring. Replace the valve spring if the valve spring becomes
scratch.
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Use the J 38606 if the clearance does not permit use of J 5892-D .
Notice: Make sure that the valve stem keys are properly seated in the valve
spring cap. Engine damage could occur if not properly installed.
10. Install the valve stem keys.
Use grease in order to hold the valve stem keys in place.
Click here for full size
11. Carefully release the valve spring pressure, making sure the valve stem keys stay
in place.
12. Remove the J 5892-D or the J 38606 and the J 22794 .
Click here for full size
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13. Install the spark plugs. Refer to Spark Plug Replacement in Engine Electrical.
14. Install the valve rocker arms to the cylinder head.
Refer to Valve Rocker Arm and Push Rod Replacement in Engine Mechanical -
4.3L .
Valve Lifter Replacement
Document ID: 195687
Removal Procedure
Tools Required
J 3049-A Valve Lifter Remover
Click here for full size
1. Remove the lower intake manifold. Refer to Intake Manifold Replacement in
Engine Mechanical - 4.3L .
2. Remove the valve pushrods and the valve rocker arms. Refer to Valve Rocker
Arm and Push Rod Replacement in Engine Mechanical - 4.3L .
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3. Remove the valve lifter pushrod guide and the bolts.
Click here for full size
4. Remove the valve lifters from the engine block. Refer to Valve Lifter Removal .
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5. Use the J 3049-A in order to remove stuck valve lifters.
Installation Procedure
Click here for full size
1. Important: It is normal for NEW lifters to make a slight ticking noise when the
engine is first started. Increasing the engine RPMs slightly to raise oil pressure
should stop the noise.
Install the valve lifters to the engine block. Refer to Valve Lifter Installation .
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2. Install the valve lifter pushrod guide. Refer to Valve Lifter Installation .
Click here for full size
3. Install the valve pushrods and valve rocker arms. Refer to Valve Rocker Arm
and Push Rod Replacement in Engine Mechanical - 4.3L .
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4. Install the intake manifold. Refer to Intake Manifold Replacement in Engine
Mechanical - 4.3L .
Exhaust Manifold Replacement -
Document ID: 194018
Removal Procedure
Click here for full size
1. Disconnect the PCV tube from the air cleaner outlet duct.
2. Remove the air cleaner outlet duct from the throttle body.
3. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement
in Engine Controls.
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4. Disconnect the engine coolant temperature (ECT) gauge sensor electrical
connector.
5. Remove the intermittent steering shaft.
o Refer to Lower Intermediate Steering Shaft Replacement in Steering
Wheel and Column - Standard.
o Refer to Lower Intermediate Steering Shaft Replacement in Steering
Wheel and Column - Tilt.
6. Disconnect the exhaust gas recirculation (EGR) valve inlet pipe from the
exhaust manifold.
Click here for full size
7. Remove the radiator inlet hose support bracket and nut.
8. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General
Information.
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9. Disconnect the exhaust pipe from the exhaust manifold. Refer to Exhaust
Manifold Pipe Replacement in Engine Exhaust.
10. Lower the vehicle to the proper height.
11. Remove the front tire to gain access to the rear exhaust manifold bolts. Wheel
Removal in Tire and Wheels.
Click here for full size
12. Remove the fender wheelhouse extension.
13. Disconnect the spark plug wires from the spark plugs. Refer to Spark P