Camshaft Replacement 6.0L, 7.0L

1. Disconnect the battery negative cable. Refer to Battery Replacement in Engine Electrical.
2. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
3. Remove the air intake duct from the air cleaner. Refer to Air Intake System Replacement in Engine Controls-6.0, 7.0L.
4. Remove the air cleaner from the throttle body. Refer to Air Cleaner and Extension Replacement in Engine Controls-6.0, 7.0L.
5. Remove the air conditioning compressor from the accessory bracket (if equipped).
6. Remove the radiator and supports from the vehicle. Refer to Radiator Replacement in Engine Cooling.
7. Remove the A/C condenser from the vehicle (if equipped).
8. Remove the intake manifold from the engine block. Refer to Intake Manifold Replacement .
9. Remove the valve rocker arms and the push rods from the cylinder heads. Refer to Valve Rocker Arm and Push Rod Replacement .
10. Remove the valve lifter from the engine block. Refer to Valve Lifter Replacement .
11. Remove the water pump from the engine block. Refer to Water Pump Replacement in Engine Cooling.
12. Remove the engine front cover from the engine block. Refer to Engine Front Cover Replacement .
13. Remove the timing chain and camshaft gear. Refer to Timing Chain and Sprocket Replacement .



14. Remove the camshaft by using the following procedure:

14.1.

Install three 5/16 18 bolts 100 mm (4-5 in) long into the threaded holes of the camshaft. Use these bolts as a handle to remove the camshaft from the engine block.

14.2.

Slowly pull the camshaft from the engine block, as not to damage the camshaft bearings in the engine block.

14.3.

Remove the camshaft from the engine block

Important: When Installing a new camshaft, always replace the valve lifters and coat the foot of the lifter with a moly type lubricant.

1. Install three 5/16 in or 5/16 in bolts that are 100 mm to 125 mm (5 in to 6 in) long into the camshaft threaded holes. Use the bolts as a handle in order to install the camshaft.
2. Coat the camshaft lobes and the journals with high viscosity oil with zinc GM P/N 123455001 or an equivalent.
3. Install the camshaft into the engine. Handle the camshaft carefully in order to prevent damage to the camshaft bearings.
4. Remove the bolts that you used as a handle.




Important: Line up the timing marks on the camshaft sprocket and the crankshaft sprocket.

5. Install the timing chain and gear on the camshaft . Refer to Timing Chain and Sprocket Replacement .
6. Install the front cover to the engine block. Refer to Engine Front Cover Replacement .

Important: Do the following when you install a new camshaft:

•	Install new valve lifter

•	Change the oil

•	Install a new oil filter

•	Add high viscosity oil with zinc GM P/N 12345501 or an equivalent.

•	Coat the foot of the valve laughter with a moly type lubricant.

7. Install the valve lifter into the engine block. Refer to Valve Lifter Replacement .
8. Install the valve push rods and valve rocker arms in the engine assembly. Refer to Valve Rocker Arm and Push Rod Replacement .
9. Install the water pump to the engine block. Refer to Water Pump Replacement .
10. Install the intake manifold on the engine block. Refer to Intake Manifold Replacement .
11. Install the radiator and the radiator support. Refer to Radiator Replacement in Engine Cooling.
12. Install the A/C condenser to the vehicle (if equipped).
13. Install the air conditioning compressor to the mounting bracket (if equipped).
14. Install the air intake duct to the vehicle. Refer to Air Intake System Replacement in Engine Controls-6.0, 7.0L.
15. Install the air cleaner assembly. Refer to Air Cleaner and Extension Replacement in Engine Controls-6.0L, 7.0L.
16. Connect the battery negative cable to the battery terminal. Refer to Battery Replacement in Engine Electrical.
17. Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.