GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

J 36660-A Torque Angle Meter


    Object Number: 36603  Size: SH
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement
  2. Align the timing marks on the sprocket so that they are as close together as possible.
  3. Remove the timing chain dampener.

  4. Object Number: 35816  Size: SH
  5. Remove the camshaft sprocket bolt.
  6. Remove the timing chain.
  7. Remove the camshaft sprocket.
  8. Important: If crankshaft sprocket does not come off easily, a light blow on the edge of the sprocket (with a plastic mallet) should dislodge the sprocket.

  9. Remove the crankshaft sprocket.
  10. Clean the timing chain.
  11. Clean the sprockets.
  12. Inspect all the components for wear or damage.
  13. If the balance shaft timing has been disturbed. Refer to Balance Shaft Replacement.
  14. Use the following steps if the pistons have been moved in the engine:
  15. 12.1. Turn the crankshaft in order to set the number one piston is at top dead center.
    12.2. With the sprocket installed, turn the camshaft in order to have the timing mark straight down.

Installation Procedure

  1. Install the timing chain onto the sprockets with the timing marks in their closest together position.
  2. Install the timing chain and sprockets.

  3. Object Number: 35816  Size: SH
  4. Install the camshaft sprocket bolt.
  5. Tighten
    Tighten the camshaft sprocket bolt to 100 N·m (74 lb ft). Use the J 36660-A in order to rotate the bolt 90°.


    Object Number: 36603  Size: SH
  6. Install the timing chain dampener.
  7. Install the timing chain dampener bolt.
  8. Tighten
    Tighten the dampener bolt to 22 N·m (16 lb ft).

    Important: Rotate the engine two revolutions and check the timing marks. Ensure the marks are aligned.

  9. Install the engine front cover. Refer to Engine Front Cover Replacement .