Notice: If the engine is damaged internally and a new engine assembly is installed in the vehicle, ensure that all foreign material is flushed out of the cooling system. You must also flush out the oil cooler system. Failure to rid the oil cooler system of debris can result in engine damage.

Tools Required

J 36857 Engine Lift Bracket

Caution: Before servicing any electrical component, the ignition and start switch must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

1. Disconnect the battery negative cable from the battery. Refer to Battery Cable Replacement .
2. Remove the air cleaner assembly (L57 ONLY). Refer to Air Cleaner Element Replacement (EFI/MFI)
3. Remove the upper intake manifold. Refer to Intake Manifold Replacement
4. Drain the cooling system. Refer to Draining and Filling Cooling System .
5. Remove the radiator inlet hose and radiator outlet hose. Refer to Radiator Hose Replacement .
6. Remove the oil fill tube clamp to radiator support bolts (L65 ONLY).
7. Remove the oil fill tube extension and hose clamp from the engine oil fill tube (L65 ONLY).
8. Remove the radiator fan shroud. Refer to Radiator Replacement (Diesel) in Engine Cooling.
9. Remove the radiator from the vehicle. Refer to Radiator Replacement (Diesel) .
10. Remove the air conditioning condenser from the vehicle.

•	For commercial applications, refer to Condenser Replacement (Commercial)

•	For motorhome applications, refer to Condenser Replacement (Motorhome)

11. Remove the fan clutch blade from the water pump. Refer to Fan Clutch Replacement (Diesel) in Engine Cooling.
12. Remove the drive belt . Refer to Drive Belt Replacement .
13. Disconnect the heater hoses from the engine. Refer to Heater Hoses Replacement in Engine Cooling.
14. Remove the generator from the mounting bracket. Refer to Generator Replacement (Diesel Engines) .
15. Remove the turbocharger assembly, if equipped. Refer to Turbocharger Replacement .
16. Remove the power steering hoses from the power steering pump.

•	For the L57 with independent suspension, refer toPower Steering Hoses Replacement (6.5L (L57) Independent) in Steering Systems.

•	For the L57 I-beam suspension, refer to Power Steering Hoses Replacement (6.5L (L57) I-Beam) in Steering Systems.

•	For the L65, refer to Power Steering Hoses Replacement (6.5L (L65) and 7.4L Engines) in Steering Systems.

17. Remove the air conditioning compressor from the power steering pump mounting bracket. Refer to Compressor Replacement (6.5L) in HVAC.
18. Disconnect the fuel lines at the front of the engine block. Refer to Fuel Hose/Pipes Assembly Replacement .
19. Remove the ground wires and nuts from the lower intake manifold bolts.
20. Disconnect the engine wiring harness connectors and position the wiring harness aside.

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.
21. Disconnect the accelerator controls cable from the fuel injection pump (L57 ONLY). Refer to Accelerator Controls Cable Replacement (MFI) in Engine Controls.
22. Remove the ground strap from the rear of the left cylinder head.
23. Remove the battery negative cable bolt from the rear of the right cylinder head.
24. Remove the crankcase depression regulator valve tube stud/nut from the engine (L65 ONLY).
25. Raise the vehicle and support with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
26. Remove the transmission fluid fill tube.

•	For the L57, refer to Filler Tube and Seal Replacement (L57) in Automatic Transmission.

•	For the L65, refer to Filler Tube and Seal Replacement (L65) in Automatic Transmission.

27. Remove the exhaust crossover pipe. Refer to Exhaust Pipe Replacement (Crossover) .
28. Remove the engine mount through bolts and nuts.
29. Remove the flywheel inspection cover from the transmission.
30. Remove the flywheel to torque converter bolts.

Important: Anytime the oil cooler lines are disconnected from the quick connectors or the engine block, the retaining clip must be replaced.

31. Disconnect the oil cooler lines from the engine block.

•	For the L57, refer to Engine Oil Cooler Line Replacement (L57)

•	For the L65, refer to Engine Oil Cooler Line Replacement (L65)

32. Remove the transmission oil cooler lines from the retaining brackets. Refer to Oil Cooler Line Replacement .
33. Remove the engine block heater electrical connection.
34. Remove the transmission to engine bolts.
35. Support the transmission assembly with a suitable support.
36. Lower the vehicle.

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.

37. Install J 36857 along with GM P/N 94282217 bolt and GM P/N 15650963 washer to the right rear cylinder head.

Tighten
Tighten the lift bracket bolt to 40 N·m (30 lb ft).

38. Attach a suitable lifting device to the lift backets .
39. Remove the engine from the vehicle.
40. Remove the lifting device from the engine.

Notice: If the engine is damaged internally and a new engine assembly is installed in the vehicle, ensure that all foreign material is flushed out of the cooling system. You must also flush out the oil cooler system. Failure to rid the oil cooler system of debris can result in engine damage.

Tools Required

J 36857 Engine Lift Bracket

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 J 36857 along with GM P/N  94282217 bolt and GM P/N 15650963 washer to the right rear cylinder head.

Tighten
Tighten the lift bracket bolt to 40 N·m (30 lb ft).

2. Attach a suitable lifting device to the engine assembly.
3. Install the engine assembly into the vehicle.
4. Remove the lifting device from the engine assembly.
5. Remove the engine lift bracket and the bolt and washer, GM P/N 94282217 and GM P/N 15650963 from the cylinder head.
6. Raise the vehicle.
7. Install the engine mount through bolts and nuts.

Tighten
Tighten the nuts to 56 N·m (41 lb ft).

8. Reconnect the electrical connector for the block heater.
9. Install the transmission to engine bolts.

Tighten
Tighten the bolts to 90 N·m (66 lb ft).

10. Remove the support from the transmission.
11. Install the flywheel to torque converter bolts.

Tighten
Tighten the bolts to 90 N·m (66 lb ft).

12. Install the flywheel inspection cover to the transmission.

Tighten
Tighten the bolts to 62 N·m (46 lb ft).

13. Install the starter to the engine block. Refer to Starter Motor Replacement (Diesel) .

Important: Any time the oil cooler lines are disconnected from the quick connectors or the engine block, the retaining clip must be replaced.

14. Connect the oil cooler lines to the engine block.

•	For the L57, refer to Engine Oil Cooler Line Replacement (L57)

•	For the L65, refer to Engine Oil Cooler Line Replacement (L65)

15. Install the transmission oil cooler lines to the retaining bracket. Refer to Oil Cooler Line Replacement .
16. Install the exhaust pipe to the turbocharger. Refer to Turbocharger Replacement .
17. Install the exhaust crossover pipe. Refer to Exhaust Pipe Replacement (Crossover) .
18. Lower the vehicle.
19. Install the air conditioning compressor to the power steering pump mounting bracket. Refer to Compressor Replacement (6.5L) in HVAC.
20. Install the generator to the generator mounting bracket. Refer to Generator Replacement (Diesel Engines) in Engine Electrical.
21. Install the power steering hoses to the power steering pump.

•	For the L57 with an independent suspension, refer toPower Steering Hoses Replacement (6.5L (L57) Independent) in Steering.

•	For the L57 with an I-beam suspension, refer to Power Steering Hoses Replacement (6.5L (L57) I-Beam) in Steering.

•	For the L65, refer to Power Steering Hoses Replacement (6.5L (L65) and 7.4L Engines) in Steering.

22. Install the air conditioning condenser in the vehicle.

•	For commercial applications, refer to Condenser Replacement (Commercial)

•	For motorhome applications, refer to Condenser Replacement (Motorhome)

23. Install the radiator in the vehicle. Refer to Radiator Replacement (Diesel) .
24. Install the radiator inlet hose and radiator outlet hose. Refer to Radiator Hose Replacement .
25. Install the fan clutch blade to the water pump. Refer to Fan Clutch Replacement (Diesel) in Engine Cooling.
26. Install the drive belt . Refer to Drive Belt Replacement .
27. Install the radiator fan shroud. Refer to Fan Shroud Replacement (Lower VIN 1) in Engine Cooling.
28. Install the oil fill tube extension and hose clamp to the engine (L65 ONLY).

Tighten
Tighten the clamp to 3 N·m (27 lb in).

29. Install the oil fill tube clamp to radiator support bolts to the radiator support (L65 ONLY).

Tighten
Tighten the bolts to 12 N·m (106 lb ft).

30. Install the transmission fluid fill tube.

•	For the L57, refer to Filler Tube and Seal Replacement (L57) in Automatic Transmission.

•	For the L65, refer to Filler Tube and Seal Replacement (L65) in Automatic Transmission.

31. Connect the heater hoses to the engine. Heater Hoses Replacement in HVAC.
32. Position the engine wiring harness and connect all electrical connectors.

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.
33. Connect the accelerator controls cable to the fuel injection pump (L57 ONLY). Refer to Accelerator Controls Cable Replacement (MFI) in Engine Controls.
34. Install the ground strap to the rear of the left cylinder head.

•	For L57 application

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

•	For L65 application

Tighten
Tighten the nut to 40 N·m (30 lb ft).

35. Install the battery negative cable bolt to the rear of the right cylinder head.

Tighten
Tighten the bolt to 40 N·m (30 lb ft).

36. Reconnect the fuel lines at the front of the engine block. Refer to Fuel Hose/Pipes Assembly Replacement .
37. Install the upper intake manifold. Refer to Intake Manifold Replacement
38. Install the air cleaner assembly (L57 ONLY). Refer to Air Cleaner Element Replacement (EFI/MFI)
39. Connect the battery negative cable. Refer to Battery Cable Replacement .
40. Refill the cooling system. Refer to Draining and Filling Cooling System .
41. Operate and test the engine. Refer to Engine Set-Up and Testing .