Timing Chain and Sprocket

TOOL REQUIRED
^ J 5825-A Crankshaft Gear Puller
^ J 38612 Crankshaft Sprocket Installer

REMOVAL
1. Disconnect the negative battery cable.
2. Drain the coolant. Recover the coolant. See Cooling System.
3. Remove the engine front cover.
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.

NOTE: 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 Crankshaft Gear Puller.

INSTALLATION





1. Install the crankshaft sprocket. Use the Crankshaft Sprocket Installer.
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 dampens.
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 lb ft).
10. Lubricate the timing chain with engine oil.
11. Install the engine front cover.
12. Fill the cooling system. See Cooling System.
13. Connect the negative battery cable.