Camshaft: Service and Repair

Camshaft Replacement

Removal Procedure
1. Disconnect the battery negative cable.
2. Remove the engine cover.
3. Remove the radiator.
4. Remove the A/C condenser.
5. Remove the engine cooling fan.
6. Remove the valve lifters.
7. Remove the timing chain and the camshaft sprocket.





8. Remove the balance shaft drive gear.





9. Remove the camshaft retainer bolts and retainer.





10. Remove the engine camshaft.
10.1. Install the three 5/16-13 x 4.0 inch bolts into the engine camshaft front bolt holes.
10.2. Using the bolts as a handle, carefully rotate and pull the engine camshaft out of the camshaft bearings.
10.3. Remove the bolts from the front of the engine camshaft.
11. Clean and inspect the camshaft and the bearings.

Installation Procedure

Important: Whenever a new camshaft is installed, do the following procedures:
^ Change the engine oil.
^ Change the engine oil filter.
^ Add GM Engine Oil Supplement GM P/N 1052367 (Canadian P/N 992367) or the equivalent to the engine oil.

1. Apply clean engine oil GM P/N 12345610 (Canadian P/N 993193) or equivalent, or engine oil supplement GM P/N 1052367 (Canadian P/N 992367) or equivalent to the following components
^ The engine camshaft lobes
^ The camshaft bearing journals
^ The camshaft bearings
2. Install three 5/16-13 x 4.0 inch bolts into the engine camshaft front bolt holes.





3. Use the bolts as a handle in order to install the engine camshaft.
4. Remove the 3 bolts from the front of tire engine camshaft.
5. If reusing the fasteners, apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the threads of the camshaft retainer bolts.





Notice: Refer to Fastener Notice in Service Precautions.

6. Install the camshaft retainer and bolts.
^ Tighten the camshaft retainer bolts to 12 Nm (106 inch lbs.).
7. Install the balance shaft drive gear. Refer to Balance Shaft Replacement for alignment of the balance shaft drive gear and the driven gear.
8. Install the timing chain and camshaft sprocket.
9. Install the valve lifters.
10. Install the A/C condenser.
11. Install the engine cooling fan.
12. Install the radiator.
13. Fill the engine cooling system.
14. Recharge the air conditioning system.
15. Install the engine cover.
16. Connect the battery negative cable.