1. Disconnect the battery negative cables from the battery. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
2. Remove the engine cover from the vehicle. Refer to Engine Cover Replacement in Interior Trim.
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 Heating, Ventilation and Air Conditioning.
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 Radiator Surge Tank Replacement in Engine Cooling.
7. Remove the air intake duct from the turbocharger.
8. Remove the transmission oil level indicator.
9. Remove the grille from the vehicle. Refer to Grille Replacement in Exterior Trim.
10. Remove the air conditioning condenser from the vehicle. Refer to Condenser Replacement in Heating, Ventilation and Air Conditioning.
11. Remove the radiator from the vehicle. Refer to Radiator Replacement in Engine Cooling.
12. Remove the timing chain from the camshaft and crankshaft. Refer to Timing Chain and Sprocket Replacement .
13. Remove the oil pump drive from the engine block. Refer to Oil Pump Drive Replacement .
14. Remove the valve lifters from the engine block. Refer to Valve Lifter Replacement .



15. Remove the thrust bearing and retainer from the engine block.



16. Remove the camshaft from the engine block, use care as not to damage the camshaft bearing.
17. Replace the key if damaged or has signs of excessive wear.

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

1. Install the key in the camshaft.
2. Install the camshaft into the engine block.

•	Coat the camshaft lobes with camshaft and valve lifter Pre Lube GM P/N 1052367 or equivalent.

•	Lubricate the camshaft bearing journals with clean engine oil.





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 oil pump drive in the engine block. Refer to Oil Pump Drive Replacement .
7. Install the radiator to the vehicle. Refer to Radiator Replacement in Engine Cooling.
8. Install the air conditioning condenser to the vehicle. Refer to Condenser Replacement in Heating, Ventilation and Air Conditioning.
9. Install the grille to the vehicle. Refer to Grille Replacement in Exterior Trim.
10. Install the air intake duct to the turbocharger.



11. Install the transmission oil level indicator and tube to the upper intake manifold.
12. Install the air cleaner assembly to the vehicle. Refer to Air Cleaner Assembly Replacement in Engine Controls-6.5L.
13. Install the surge tank to the vehicle. Refer to Radiator Surge Tank Replacement in Engine Cooling.
14. Connect the battery negative cables to the batteries. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
15. Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
16. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging in Heating, Ventilation and Air Conditioning.

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.

17. Perform TDC offset timing adjustment. Refer to Fuel Injection Pump Top Dead Center Offset Adjustment in Engine Controls-6.5L (L65).
18. Install the engine cover in the vehicle. Refer to Engine Cover Replacement in Exterior Trim.