Timing Chain and Sprocket

REMOVAL PROCEDURE

^ Tools Required
- J5825-A Crankshaft Sprocket Puller





1. Remove the [1][2]engine front cover.
2. Rotate the crankshaft until the timing marks in the following locations are aligned:
^ The camshaft alignment pin (1).
^ The timing chain dampener (2) to the crankshaft sprocket (3).
^ The crankshaft key (4).
^ The timing chain dampener (5) to the camshaft sprocket locator hole (6).





3. Remove the camshaft sprocket bolt.





4. Remove the camshaft sprocket and the timing chain.





5. Use the J 5825-A





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





8. If necessary remove the camshaft thrust plate bolts.
9. Remove the camshaft thrust plate.
10. Clean and inspect the timing chain and gears.

INSTALLATION PROCEDURE

^ Tools Required
- J 38612 Crankshaft Sprocket Installer





1. If removed install the camshaft thrust plate.
2. Install the camshaft thrust plate bolts.
^ Tighten the camshaft thrust plate screws to 10 Nm (89 inch lbs.).

Notice: Refer to Fastener Notice in Service Precautions.





3. Install the crankshaft sprocket using the J 38612
4. Remove the J 38612
5. Apply Engine Oil Supplement (EOS) GM P/N 1052367 or equivalent to the sprocket thrust surface.





6. Install the timing chain dampener to the block.
^ Tighten the timing chain dampener bolts to 21 Nm (115 ft. lbs.).





7. Hold the camshaft sprocket with the chain hanging down, and install the chain to the crankshaft gear.





8. Align the crankshaft timing mark (3) to the timing mark on the bottom of the timing chain dampener (2).
9. Align the timing mark on the camshaft gear, center line of the locator hole (6), with the timing mark on the top of the chain dampener (5).
10. Align the dowel in the camshaft with the dowel hole in the camshaft sprocket (1).





11. Install the camshaft sprocket bolt.
12. Draw the camshaft sprocket onto the camshaft using the mounting bolt.
^ Tighten the camshaft sprocket bolt to 140 Nm (103 ft. lbs.).
13. Coat the crankshaft and camshaft sprocket with engine oil.
14. Install the [1][2]engine front cover.