GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 45059 Torque Angle Meter

Removal Procedure

  1. Remove the engine front cover. Refer to Engine Front Cover Replacement .

  2. Object Number: 192708  Size: SH
  3. Align the timing marks on the sprockets so that they are as close as possible.

  4. Object Number: 153593  Size: SH
  5. Remove the timing chain dampener bolt.
  6. Remove the timing chain dampener.

  7. Object Number: 248088  Size: SH
  8. Remove the camshaft sprocket bolt.

  9. Object Number: 153596  Size: SH
  10. Remove the camshaft sprocket and the timing chain.
  11. 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.

  12. Remove the crankshaft sprocket.

  13. Object Number: 97869  Size: SH
  14. Remove the balance shaft drive gear in order to access the camshaft thrust plate, if required.

  15. Object Number: 190552  Size: SH
  16. Remove the camshaft thrust plate bolts, if required.
  17. Remove the camshaft thrust plate, if required.

  18. Object Number: 97868  Size: SH
  19. Remove the balance shaft driven gear bolt, if required.
  20. Remove the balance shaft driven gear, if required.
  21. Clean and inspect all of the components for wear and/or damage. Refer to Camshaft Timing Chain and Sprocket Cleaning and Inspection .
  22. If the pistons have been moved in the engine, use the following procedure:
  23. 14.1. Turn the crankshaft so that the number one piston is at top dead center.
    14.2. Turn the camshaft so that, with the sprocket temporarily installed, the timing mark is straight down.

Installation Procedure


    Object Number: 97868  Size: SH
  1. Install the balance shaft driven gear, if required.
  2. Notice: Refer to Fastener Notice in the Preface section.

    Notice: This bolt is designed to permanently stretch when tightened, and therefore MUST be replaced anytime it is removed. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

  3. Prevent the balance shaft from rotating and install the balance shaft driven gear bolt, if required.
  4. Tighten

    1. Tighten the balance shaft driven gear bolt to 22 N·m (16 lb ft).
    2. Use theJ 45059 to rotate the bolt an additional 70 degrees.

    Object Number: 190552  Size: SH
  5. Install the camshaft thrust plate, if required.
  6. Install the camshaft thrust plate bolts, if required.
  7. Tighten
    Tighten the bolts to 15 N·m (11 lb ft).


    Object Number: 97869  Size: SH
  8. Install the balance shaft drive gear.

  9. Object Number: 97752  Size: SH
  10. Align the timing marks on the balance shaft drive gear and the balance shaft driven gear.

  11. Object Number: 153596  Size: SH
  12. Install the crankshaft sprocket.
  13. Install the timing chain and sprocket.

  14. Object Number: 192708  Size: SH
  15. Assemble the timing chain on the sprockets with the timing marks as close together as possible.

  16. Object Number: 248088  Size: SH
  17. Install the camshaft sprocket bolt.
  18. Tighten

    1. Tighten the bolt to 100 N·m (74 lb ft).
    2. Use theJ 45059 to rotate the bolt an additional 90 degrees.

    Object Number: 153593  Size: SH
  19. Install the timing chain dampener.
  20. Install the timing chain dampener bolt.
  21. Tighten
    Tighten the bolt to 22 N·m (16 lb ft).

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

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