Timing Chain Replacement

Tools Required:
J 5825-A Crankshaft Sprocket Remover
J 38612 Crankshaft Sprocket Installer






Remove or Disconnect
1. Negative battery cable.
2. Drain and recover coolant.
3. Crankcase front cover.
4. Place #1 piston at top dead center with the marks on the camshaft and crankshaft sprockets aligned (#4 firing position).
5. Camshaft sprocket and 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.

6. Crankshaft sprocket using J 5825-A.

Install or Connect
1. Crankshaft sprocket using J 38612.
2. Apply GM EOS P/N 1052367 or equivalent to the sprocket thrust surface.





3. Hold the sprocket with the chain hanging down and align the marks on the camshaft and crankshaft sprockets.
4. Align dowel in camshaft with dowel hole in camshaft sprocket.
5. Draw the camshaft sprocket onto camshaft using the mounting bolts.

Tighten
^ Camshaft sprocket mounting bolts to 100 Nm (74 lbs. ft.).

6. Lubricate timing chain with engine oil.
7. Crankcase front cover.
8. Fill cooling system.
9. Negative battery cable.