Timing Chain: Service and Repair

Camshaft Timing Chain and Sprocket Replacement

Removal Procedure

1. Remove the engine front cover. Refer to Engine Front Cover Replacement (Service and Repair).




2. Remove the camshaft sprocket bolts.
3. Remove the camshaft sprocket and timing chain.




4. Remove the crankshaft sprocket.




5. Remove the timing chain dampener bolts.
6. Remove the timing chain dampener.

Installation Procedure




1. Install the crankshaft sprocket.
2. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or the equivalent to the crankshaft sprocket thrust surface.




3. Install the timing chain dampener.

Caution: Refer to Fastener Caution (Fastener Caution).

4. Install the timing chain dampener bolts and tighten to 21 Nm (15 lb ft).




5. Align the crankshaft timing mark (2) to the timing mark on the bottom of the timing chain dampener (1).
6. Hold the camshaft sprocket with the timing chain hanging down and install the timing chain to the crankshaft gear.
7. Align the timing mark on the camshaft gear (4) with the timing mark on top of the timing chain dampener (3).




8. Align the dowel in the camshaft with the dowel hole in the camshaft sprocket.
9. Draw the camshaft sprocket onto the camshaft using the mounting bolts.
10. Coat the crankshaft and camshaft sprocket with engine oil and tighten the bolts to 16 Nm (12 lb ft).
11. Install the engine front cover. Refer to Engine Front Cover Replacement (Service and Repair).