GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1704628  Size: SH
  1. Clean the components with cleaning solvent.
  2. Caution: Refer to Safety Glasses and Compressed Air Caution in the Preface section.

  3. Dry the components with compressed air.
  4. Inspect the timing chain (1) for binding or wear.
  5. Inspect the camshaft position (CMP) sensor raised areas (2) for nicks or damage.
  6. Inspect for worn, damaged, or chipped teeth (3).
  7. Inspect for a damaged keyway (4).
  8. Inspect for worn oil pump drive splines (5).

  9. Object Number: 1658210  Size: SH
  10. Inspect the timing chain tensioner for the following conditions:
  11. • Damaged or broken tension spring (1)
    • Excessive wear or scoring on the chain guide surfaces (2, 3)