Tools Required

1. Open the hood.
2. Place fender covers over both fenders.
3. Raise the hood to the service position, perform the following:

3.1.	Remove the hood hinge bolts (1).

3.2.	Raise the hood until vertical.

3.3.	Install the hood hinge bolts until snug in the service position (2).

4. Remove the air conditioning (AC) compressor. Refer to Air Conditioning Compressor Replacement in HVAC Systems - Manual.
5. Remove the radiator supports. Refer to Radiator Support Replacement in Body Front End.



6. Reposition the radiator inlet hose clamp at the water pump.
7. Remove the radiator inlet hose from the water pump.



8. Reposition the radiator outlet hose clamp at the water pump.
9. Remove the radiator outlet hose from the water pump.
10. Remove the heater hoses. Refer to Heater Inlet Hose Replacement and Heater Outlet Hose Replacement in Heating, Ventilation, and Air Conditioning.



11. If equipped with the 4.8L, 5.3L, or 6.0L regular production option (RPO) LQ4, loosen the intake manifold sight shield bolt.
12. Remove the sight shield from the retainer.



13. If equipped with the 6.0L with RPO LQ9, loosen the intake manifold sight shield bolt.
14. Remove the sight shield from the retainer.



15. If equipped with the 6.0L with RPO LQ9, loosen the left fuel rail cover bolts.
16. Remove the left fuel rail cover.



17. If equipped with the 6.0L with RPO LQ9, loosen the right fuel rail cover bolts.
18. Remove the right fuel rail cover.



19. Unsnap the cruise control cable from the throttle body lever, if equipped.
20. Remove the cruise control cable from the bracket, if equipped.



21. Remove the cruise control cable clip from the sight shield retainer, if equipped.



22. Disconnect the accelerator control cable from the throttle body lever, if required.
23. Remove the accelerator control cable from the bracket, if required.



24. Remove the accelerator control cable from the sight shield retainer, if required.
25. Remove the upper intake manifold sight shield retainer bolts and retainer, if necessary.



26. Disconnect the following electrical connectors:

•	Evaporative emissions (EVAP) canister purge solenoid (1)

•	Generator (3)

27. Remove the harness bracket nut (2) in order to remove the engine harness from the intake manifold.



28. Reposition the vent inlet hose clamp at the throttle body.
29. Remove the radiator vent inlet hose from the throttle body.



30. Remove the generator cable from the generator, perform the following:

30.1.

Slide the boot down revealing the terminal stud.

30.2.

Remove the generator cable nut from the terminal stud.

30.3.

Remove the generator cable.




31. Disconnect the main coil harness (2) and fuel injector (3) electrical connectors on the left side.



32. Disconnect the following electrical connectors:

•	Main coil harness (1)

•	Fuel injectors (3)

•	Exhaust gas recirculation (EGR) valve (4)




33. Disconnect the throttle position (TP) sensor and idle air control (IAC) valve electrical connectors.



34. Disconnect the manifold absolute pressure (MAP) sensor (1) and knock sensor (2) electrical connectors.



35. Remove the harness ground bolt.
36. Reposition the harness ground and negative battery cable from the block.
37. Disconnect the following electrical connectors:

•	Coolant temperature sensor (1)

•	Electronic variable orifice switch (2)




38. Remove the harness ground bolt at the right rear of the engine block.
39. Reposition the harness ground, and auxiliary negative battery cable, if equipped from the block.
40. Remove the harness ground bolt at the left rear of the engine block
41. Reposition the harness ground, and engine ground strap from the block.
42. Disconnect the following electrical connectors:

•	Oil pressure sensor (1)

•	Camshaft position (CMP) sensor (2)

43. Unclip all of the engine harness clips from the engine.



44. Remove the battery cable junction block from the junction block bracket.



45. Remove the EVAP purge solenoid vent tube, perform the following:

•	Remove the EVAP tube end (2) from the solenoid (1).

•	Remove the EVAP tube end (3) from the vapor pipe.

46. Disconnect the fuel pipes. Refer to Metal Collar Quick Connect Fitting Service or Plastic Collar Quick Connect Fitting Service in Engine Controls - 4.8L, 5.3L, and 6.0L.
47. Raise the vehicle.



48. Disconnect the following electrical connectors:

•	The crankshaft position (CKP) sensor (1)

•	The engine oil level sensor (6)

•	The coolant heater, if equipped




49. Remove the battery cable channel bolt.
50. Slide the channel pin out of the oil pan tab.
51. Gather all branches of the engine wiring harness and reposition off to the side.
52. Lower the vehicle.



53. Remove the rear power steering pump-to-engine block bolt.
54. Remove the generator bracket mounting bolts.
55. Position the bracket aside.



56. Remove the vacuum brake booster hose.
57. Remove the ignition coil, as required for the proper fit of the J 41798 before lifting the engine. Refer to Ignition Coil Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L.




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.

58. Install the J 41798 to the cylinder heads.

Tighten

•	Tighten the M8 engine lift bracket bolts to 25 N·m (18 lb ft).

•	Tighten the M10 engine lift bracket bolts to 50 N·m (37 lb ft).




59. Remove the left and right engine mount-to-engine mount bracket bolts.
60. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.



61. Remove the engine shield bolts and shield.



62. Remove the oil pan skid plate bolts and plate, if equipped.
63. Drain the engine oil.
64. Remove the starter motor. Refer to Starter Motor Replacement in Engine Electrical.
65. Remove the catalytic converter. Refer to Catalytic Converter Replacement in Engine Exhaust.



66. Remove the positive battery cable clip bolt and clip.



67. Remove the flywheel to torque converter bolts, if equipped.



68. Remove the transmission oil level indicator tube nut , if equipped.



69. Remove the transmission oil level indicator tube, if equipped.



70. If equipped with the 4L60-E automatic transmission, remove the transmission bolt and stud on the right side.



71. If equipped with the 4L80-E automatic transmission, remove the transmission converter cover bolts.



72. Remove the automatic transmission bolt/studs, if equipped.
73. Separate the engine from the automatic transmission, if equipped.

Install the J 21366 to the transmission in order to hold the torque converter.

74. Lower the vehicle.
75. Install an engine hoist to the J 41798
76. Install a floor jack under the transmission for support.

Notice: Use care while moving the engine assembly in order to avoid breaking the MAP sensor locating tabs. Broken MAP sensor tabs may result in decreased engine performance.

77. Remove the engine.
78. Install the engine to an engine stand.
79. Remove the engine hoist.



80. Remove the J 41798 from the engine.

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.

1. Install the J 41798 to the engine.

Tighten

•	Tighten the M8 engine lift bracket bolts to 25 N·m (18 lb ft).

•	Tighten the M10 engine lift bracket bolts to 50 N·m (37 lb ft).

2. Install an engine hoist to the J 41798 .
3. Remove the engine from the engine stand.
4. Install the engine to the vehicle.
5. Align the engine and transmission.



6. Install the left and right engine mount-to-engine mount bracket bolts.

Tighten
Tighten the engine mount-to-engine mount bracket bolts to 65 N·m (48 lb ft).

7. Install the upper transmission bolts until snug.
8. Remove the floor jack from under the transmission.
9. Remove the engine hoist.



10. Remove the J 41798 from the engine.



11. Install the ignition coils and the spark plug wires. Refer to Ignition Coil Replacement in Engine Controls - 4.8L, 5.3L and 6.0L.
12. Raise the vehicle.



13. Remove the J 21366 from the transmission.
14. Install the automatic transmission bolt/studs, if equipped.



15. If equipped with the 4L80-E automatic transmission, install the transmission converter cover bolts.



16. If equipped with the 4L60-E automatic transmission, install the transmission bolt and stud on the right side.

Tighten
Tighten the automatic transmission bolts/studs to 50 N·m (37 lb ft).




17. Install the automatic transmission oil level indicator tube, if equipped.



18. Install the automatic transmission oil level indicator tube nut, if equipped.

Tighten
Tighten the automatic transmission oil level indicator tube nut to 18 N·m (13 lb ft).




19. Install the flywheel to torque converter bolts, if equipped.

Tighten

•	If equipped with a 4L60E transmission, tighten the bolts to 63 N·m (47 lb ft).

•	If equipped with a 4L80E transmission, tighten the bolts to 60 N·m (44 lb ft).




20. Install the positive battery cable clip and bolt.

Tighten
Tighten the positive battery cable clip bolt to 9 N·m (80 lb in).

21. Install the catalytic converter. Refer to Catalytic Converter Replacement in Engine Exhaust.
22. Install the starter motor. Refer to Starter Motor Replacement in Engine Electrical.



23. Install the oil pan skid plate and bolts, if equipped.

Tighten
Tighten the oil pan skid plate bolts to 20 N·m (15 lb ft).




24. Install the engine shield and bolts.

Tighten
Tighten the engine shield bolts to 20 N·m (15 lb ft).

25. Lower the vehicle.



26. Install the vacuum brake booster hose.



27. Position the generator bracket to the front of the engine.
28. Install the generator bracket bolts until snug.
29. Install the rear power steering pump-to-engine block bolt until snug.

Tighten

•	Tighten the rear power steering pump bolt to 50 N·m (37 lb ft).

•	Tighten the generator bracket bolts to 50 N·m (37 lb ft).

30. Route the engine wiring harness to the lower engine area.
31. Raise the vehicle.



32. Slide the channel pin into the oil pan tab.
33. Install the battery cable channel bolt.

Tighten
Tighten the battery cable channel bolt to 12 N·m (106 lb in).




34. Connect the following electrical connectors:

•	The CKP sensor (1)

•	The engine oil level sensor (6)

•	The coolant heater, if equipped

35. Lower the vehicle.
36. Connect the fuel pipes.



37. Install the EVAP purge solenoid vent tube to the solenoid (1).
38. Install the EVAP tube end (3) to the vapor pipe.



39. Install the battery cable junction block to the junction block bracket.
40. Clip all of the engine wiring harness clips to their correct location.



41. Connect the following electrical connectors:

•	Oil pressure sensor (1)

•	CMP sensor (2)

42. Position the harness ground and the engine ground strap to the block.
43. Install the harness ground bolt at the left rear of the engine block.
44. Position the harness ground, and auxiliary negative battery cable, if equipped to the block.
45. Install the harness ground bolt at the right rear of the engine block.

Tighten
Tighten the harness ground bolts at the rear of the block to 16 N·m (12 lb ft).




46. Connect the following electrical connectors:

•	Coolant temperature sensor (1)

•	Electronic variable orifice switch (2)

47. Position the harness ground and negative battery cable to the block.
48. Install the harness ground bolt.

Tighten
Tighten the harness ground bolt to 25 N·m (18 lb ft).




49. Connect the MAP sensor (1) and knock sensor (2) electrical connectors.



50. Connect the TP sensor and IAC valve electrical connectors.



51. Connect the following electrical connectors:

•	Main coil harness (1)

•	Fuel injectors (3)

•	EGR valve (4)




52. Connect the main coil harness (2) and fuel injector (3) electrical connectors on the left side.



53. Install the generator cable to the generator, perform the following:

•	Install the generator cable.

•	Install the generator cable nut to the terminal stud.

Tighten
Tighten the generator output terminal nut to 9 N·m (80 lb in).

•	Slide the boot over the terminal stud.




54. Install the radiator vent inlet hose to the throttle body.
55. Position the vent inlet hose clamp at the throttle body.



56. Install the engine wiring harness bracket and nut (2).

Tighten
Tighten the engine wiring harness bracket nut to 5 N·m (44 lb in).

57. Connect the following electrical connectors:

•	EVAP canister purge solenoid (1)

•	Generator (3)

58. Install the engine sight shield retainer and bolts.

Tighten
Tighten the engine sight shield retainer bolts to 5 N·m (44 lb in).

Caution: In order to avoid possible injury or vehicle damage, always replace the accelerator control cable with a NEW cable whenever you remove the engine from the vehicle.

In order to avoid cruise control cable damage, position the cable out of the way while you remove or install the engine. Do not pry or lean against the cruise control cable and do not kink the cable. You must replace a damaged cable.
59. Install a NEW accelerator control cable. if required. Refer to Accelerator Control Cable Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L.



60. Install the cruise control cable clip to the sight shield retainer, if equipped.



61. Install the cruise control cable to the bracket, if equipped.
62. Snap the cruise control cable to the throttle body lever, if equipped.



63. If equipped with the 6.0L with RPO LQ9, install the right fuel rail cover.
64. Tighten the fuel rail cover bolts.

Tighten
Tighten the bolts to 9 N·m (80 lb in).




65. If equipped with the 6.0L with RPO LQ9, install the left fuel rail cover.
66. Tighten the fuel rail cover bolts.

Tighten
Tighten the bolts to 9 N·m (80 lb in).




67. If equipped with the 6.0L with RPO LQ9, install the engine sight shield to the retainer.
68. Tighten the engine sight shield bolt.

Tighten
Tighten the bolt to 9 N·m (80 lb in)




69. If equipped with the 4.8L, 5.3L, or 6.0L with RPO LQ4, install the engine sight shield to the retainer.
70. Tighten the engine sight shield bolt.

Tighten
Tighten the bolt to 10 N·m (89 lb in)

71. Install the heater hoses. Refer to Heater Inlet Hose Replacement and Heater Outlet Hose Replacement in Heating, Ventilation and Air Conditioning.



72. Install the radiator outlet hose to the water pump.
73. Position the radiator outlet hose clamp at the water pump.



74. Install the radiator inlet hose to the water pump.
75. Position the radiator inlet hose clamp at the water pump.
76. Install the radiator supports. Refer to Radiator Support Replacement in Body Front End.
77. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement in HVAC System - Manual.



78. Remove the hood hinge bolts from the service position (2).
79. Lower the hood to the normal position.
80. Install the hood hinge bolts.

Tighten
Tighten the bolts to 25 N·m (18 lb ft).

81. Remove the fender covers.
82. Fill the crankcase with the proper quantity and grade of engine oil. Refer to Approximate Fluid Capacities or Fluid and Lubricant Recommendations in Maintenance and Lubrication.
83. Perform the CKP system variation learn procedure. Refer to Crankshaft Position System Variation Learn in Engine Controls - 4.8L, 5.3L, and 6.0L.

Important: After an overhaul, the engine should be tested. Use the following procedure after the engine is installed in the vehicle.

83.1.

Disable the ignition system.

83.2.

Crank the engine several times. Listen for any unusual noises or evidence that parts are binding.

83.3.

Enable the ignition system.

83.4.

Start the engine and listen for unusual noises.

83.5.

Check the vehicle oil pressure gauge or light and confirm that the engine has acceptable oil pressure.

83.6.

Run the engine speed at about 1000 RPM until the engine has reached normal operating temperature.

83.7.

Listen for sticking lifter and other unusual noises.

83.8.

Inspect for fuel, oil and/or coolant leaks while the engine is running.

83.9.

Perform a final inspection for the proper engine oil and coolant levels.

84. Close the hood.