Tools Required

1. Remove the hood.
2. Disconnect the negative battery cables. Refer to

   Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

   in General Information.
3. Evacuate the air conditioning (A/C) system. Refer to HVAC.
4. Drain the cooling system. Refer to Cooling and Radiator.
5. Remove the air cleaner assembly and the intake duct.
6. Cover the mouth of the intake manifold with the J 39664 .
7. Remove the generator wires and clips. Refer to Engine Electrical.
8. Remove the wiring at the fuel injector pump.
9. Remove the wiring from the valve rocker arm clips, including the glow plug relay, and the temperature solenoid.
10. For the L56, remove the EGR/Boost solenoid. Move the harness aside.
11. For the L65 remove the Boost solenoid. Move the harness aside.
12. Remove the ground strap.
13. Remove the engine cooling fan. Refer to Cooling and Radiator.
14. Remove the power steering pump and reservoir.
15. Remove the heater hose at the engine.
16. With the aid of an assistant, remove the radiator and A/C condenser as an assembly. Refer to Cooling and Radiator.

•	Support the transmission with a jack.

Notice: Damage may result from the use of an improper bolt when attaching J36857 into the cylinder head.

•	Install the J 41427 to the right rear cylinder head.

17. Raise the vehicle.
18. Support the vehicle with safety stands.
19. Remove the flywheel inspection cover.
20. Remove the flywheel to torque converter bolts (automatic transmission).
21. Remove the exhaust pipes at the exhaust manifolds. Refer to Exhaust Systems.
22. Remove the front propeller shaft (if equipped). Refer to Propeller Shaft.
23. Remove the starter. Refer to Engine Electrical.
24. Remove the bellhousing bolts.
25. Remove the front engine mount through-bolts.
26. Remove the block heater wire (if equipped).
27. Remove the wiring harness.
28. Remove the transmission cooler lines. Refer to Transmission and Clutch.
29. Remove the front battery cable clamp at the oil pan.
30. Remove the fuel return lines at the engine.
31. Remove the oil cooler lines at the engine. Refer to Cooling and Radiator.

•	Any time the oil cooler lines are disconnected from the quick connectors or the block, the retaining clip needs to be replaced.

•	Lower the vehicle.

32. Remove the attaching bolt. Use GM P/N 23503910 or equivalent.

Tighten
Tighten the lift bracket bolt to 55 N·m (40 lb ft).

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.

33. Remove the lifting device and chain to the J 41427 and accessory bracket eyelet.
34. Remove the engine.

1. Install the engine.
2. Remove the lifting device and chain to the J 41427 and accessory bracket eyelet.
3. Remove the attaching bolt.

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

4. Install the oil cooler lines at the engine. Refer to Cooling and Radiator.
5. Install the bellhousing bolts.
6. Install the engine mount through-bolts.
7. Install the fuel return lines at the engine.
8. Install the front battery cable clamp at the oil pan.
9. Install the transmission cooler lines. Refer to Transmission and Clutch.
10. Install the wiring harness.
11. Install the block heater wire (if equipped).
12. Install the flywheel to torque converter bolts. (automatic transmission)
13. Install the starter. Refer to Engine Electrical.
14. Install the front propeller shaft (if equipped). Refer to Propeller Shaft.
15. Install the exhaust pipes at the exhaust manifolds. Refer to Exhaust Systems.
16. Install the flywheel inspection cover.
17. Lower the vehicle.
18. Install the power steering pump and reservoir.
19. With the aid of an assistant, Install the radiator and A/C condenser as an assembly. Refer to Cooling and Radiator.
20. Install the heater hose at the engine.
21. Install the engine cooling fan. Refer to Cooling and Radiator.
22. Install the ground strap.
23. Install the EGR/Boost solenoid.
24. Install the wiring to the valve rocker arm clips, including the glow plug relay, and the temperature solenoid.
25. Install the wiring to the fuel injector pump.
26. Install the generator wires and clips. Refer to Engine Electrical.
27. Remove the cover from the mouth of the intake manifold with the J 39664 .
28. Install the air cleaner box and the intake duct.
29. Refill the cooling system with the proper quantity and type of coolant. Refer to Cooling and Radiator.
30. Charge the air conditioning (A/C) system. Refer to HVAC.
31. Connect the negative battery cables.
32. Install the hood.