Timing Chain and Sprocket
REMOVAL PROCEDURE^ Tool Required
- J 5825-A Crankshaft Gear Puller
1. Disconnect the negative battery cable. Refer to Battery Disconnect Caution in Service Precautions.
2. Drain the coolant. Recover the coolant. Refer to Draining, Flushing and Filling the Cooling System in Cooling and Radiator.
3. Remove the crankcase front cover. Refer to Engine Front Cover Replacement.
4. Place the #1 piston at top dead center (#4 firing position). Align the mark on the camshaft sprocket with the timing mark on the bottom of the timing chain dampener.
5. Remove the camshaft sprocket bolt.
6. Remove the camshaft sprocket.
7. Remove the timing chain.
IMPORTANT: If the sprocket does not come off easily, a light blow on the lower edge of the sprocket (with a plastic mallet) should dislodge the sprocket.
8. Remove the crankshaft sprocket. Use the J 5825-A.
INSTALLATION PROCEDURE
^ Tools Required
- J 38612 Crankshaft Sprocket Installer
1. Install the crankshaft sprocket. Use the J 38612.
2. Apply GM EOS P/N 1052367 or its equivalent to the sprocket thrust surface.
3. Install the chain dampener to the cylinder block.
4. Align the timing mark on the crankshaft sprocket to the mark on the bottom of the chain dampener.
5. Hold the sprocket with the chain hanging down.
6. Install the timing chain to the crankshaft gear.
7. Align the centerline of the locator hole, on the camshaft gear, with the timing mark on the top of the timing chain dampener.
8. Align the dowel in the camshaft with the dowel hole in the camshaft sprocket.
9. Use the mounting bolts in order to draw the camshaft sprocket onto the camshaft.
^ Tighten the mounting bolts to 100 Nm (74 ft. lbs.).
NOTICE: Refer to Fastener Notice in Service Precautions.
10. Lubricate the timing chain with engine oil.
11. Install the crankcase front cover. Refer to Engine Front Cover Replacement
12. Fill the cooling system. Refer to Draining, Flushing and Filling the Cooling System in Cooling and Radiator.
13. Connect the negative battery cable.