Timing Chain and Sprocket Replacement (Unit Repair)

Timing Chain and Sprockets Replacement

^ Tools Required
^ J5825-A Crankshaft Sprocket Puller
^ J38612 Crankshaft Sprocket Installer

Removal Procedure

1. Remove the engine front cover.





2. Align the crankshaft timing mark (2) to the timing mark on the bottom of the timing chain dampener (1).
3. Align the timing mark on the camshaft gear (4) with the timing mark on top of the timing chain dampener (3).





4. Remove the camshaft sprocket bolt.
5. Remove the camshaft sprocket and timing chain.





6. Remove the crankshaft sprocket. Use the J5825-A.





7. Remove the timing chain dampener bolts.
8. Remove the timing chain dampener.

Installation Procedure





1. Install the crankshaft sprocket using the J38612.
2. Apply prelube GM P/N 1052365 or the equivalent to the crankshaft sprocket thrust surface.





3. Install the timing chain dampener.

Notice: Refer to Fastener Notice in Service Precautions.

4. Install the timing chain dampener bolts.
^ Tighten the timing chain dampener bolt to 21 Nm (15 ft. lbs.).





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 bolt.
10. Coat the crankshaft and camshaft sprocket with engine oil.
^ Tighten the bolt to 140 Nm (103 ft. lbs.).
11. Install the engine front cover.