Notice: Perform TDC Offset Recovery procedure if the timing chain, timing gears, engine front cover, crankshaft position sensor, crankshaft or other components affecting the timing are replaced.

1. Disconnect the battery negative cables from the battery.

•	For the front battery, refer to Battery Cable Replacement in Engine Electrical.

•	For the auxiliary battery, refer to Battery Cable Replacement in Engine Electrical.

2. Remove the engine cover from the vehicle. Refer to Engine Cover Replacement in Body and Accessories.
3. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
4. Evacuate the air conditioning system. Refer to Refrigerant Recovery and Recharging in HVAC.
5. Remove the air cleaner assembly from the vehicle. Refer to Air Cleaner Assembly Replacement in Engine Controls-6.5L.
6. Remove the surge tank from then vehicle. Refer to Surge Tank (Diesel) Replacement in Engine Cooling.
7. Remove the air intake duct from the turbocharger.
8. Remove the transmission oil level indicator and tube from the upper intake manifold.
9. Remove the grille from the vehicle. Refer to Grille Replacement in Body and Accessories.
10. Remove the radiator support from the vehicle. Refer to Radiator Support Replacement in Body and Accessories.
11. Remove the air conditioning condenser from the vehicle. Refer to Condenser Replacement in HVAC.
12. Remove the radiator from the vehicle. Refer to Radiator Replacement in Engine Cooling.
13. Remove the drive belts from the pulleys. Refer to Drive Belt Replacement .
14. Remove the engine cooling fan from the water pump. Refer to Water Pump Replacement in Engine Cooling.
15. Remove the engine front cover from the engine block. Refer to Engine Front Cover Replacement .
16. Remove the timing chain from the camshaft and crankshaft. Refer to Timing Chain and Sprocket Replacement .
17. Remove the upper intake manifold from the turbocharger. Refer to Intake Manifold Replacement .
18. Remove the lower intake manifold from the cylinder head. Refer to Intake Manifold Replacement .
19. Remove the valve rocker arm covers from the cylinder heads. Refer to Valve Rocker Arm Cover Replacement .
20. Remove the turbocharger from the engine block. Refer to Turbocharger Replacement .
21. Remove the oil pump drive from the engine block. Refer to Oil Pump Drive Replacement .
22. Remove the cylinder heads from the engine block. Refer to Cylinder Head Replacement .
23. Remove the valve lifters from the engine block. Refer to Valve Lifter Replacement .



24. Remove the thrust bearing and retainer from the engine block.
25. Remove the camshaft spacer from the engine block.



26. Remove the camshaft from the engine block, use care as not to damage the camshaft bearing.
27. Replace the wood drift if the key is damaged or has signs of excessive wear.

Important: Whenever a new camshaft is installed, replace all valve lifters, wood drift key, engine oil, and oil filter.

Notice: Perform TDC Offset Recovery procedure if the timing chain, timing gears, engine front cover, crankshaft position sensor, crankshaft or other components affecting the timing are replaced.

1. Install the camshaft into the engine block.

•	Coat the camshaft lobes with camshaft and valve lifter Pre Lube GM P/N 1052365 or equivalent.

•	Lubricate the camshaft bearing journals with clean engine oil.




2. Install the spacer with the chamfer towards the camshaft.

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.

3. Install the thrust plate and bearing.

Tighten
Tighten the bolts to 25 N·m (17 lb ft).

4. Install the timing chain and sprocket to the camshaft. Refer to Timing Chain and Sprocket Replacement .
5. Install the valve lifters in the engine block. Refer to Valve Lifter Replacement .
6. Install the engine front cover on the engine block. Refer to Engine Front Cover Replacement .
7. Install the oil pump drive in the engine block. Refer to Oil Pump Drive Replacement .
8. Install the cylinder heads on the engine block. Refer to Cylinder Head Replacement .
9. Install the valve rocker arm cover to the cylinder heads. Refer to Valve Rocker Arm Cover Replacement .
10. Install the lower intake manifold to the cylinder heads. Refer to Intake Manifold Replacement .
11. Install the turbocharger to the engine block. Refer to Turbocharger Replacement .
12. Install the upper intake manifold to the turbocharger. Refer to Intake Manifold Replacement .
13. Install the engine cooling fan to the water pump. Refer to Fan Clutch Replacement in Engine Cooling.
14. Install the drive belt ion the pulleys. Refer to Drive Belt Replacement .
15. Install the radiator to the vehicle. Refer to Radiator Hose Replacement in Engine Cooling.
16. Install the radiator support to the vehicle. Refer to Radiator Support Replacement in Body and Accessories.
17. Install the air conditioning condenser to the vehicle. Refer to Condenser Replacement in HVAC.
18. Install the grille to the vehicle. Refer to Grille Replacement in Body and Accessories.
19. Install the air intake duct to the turbocharger.



20. install the transmission oil level indicator and tube to the upper intake manifold.
21. Install the air cleaner assembly to the vehicle. Refer to Air Cleaner Assembly Replacement in Engine Controls-6.5L.
22. Install the surge tank to the vehicle. Refer to Surge Tank (Diesel) Replacement in Engine Cooling.
23. Connect the battery negative cables to the batteries.

•	For the front battery, refer to Battery Cable Replacement in Engine Electrical.

•	For the auxiliary battery, refer to Battery Cable Replacement in Engine Electrical.

24. Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
25. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging in HVAC.
26. Inspect fuel injection pump timing. Refer to Fuel Injection Pump Timing Adjustment in Engine Controls 6-5L.
27. Perform TDC offset timing adjustment. Refer to Fuel Injection Pump Top Dead Center Offset Adjustment in Engine Controls 6-5L.
28. Install the engine cover in the vehicle. Refer to Engine Cover Replacement in Body and Accessories.