GM Service Manual Online
For 1990-2009 cars only

    Object Number: 677756  Size: SH
  1. Clean the camshaft timing components in solvent.
  2. Caution: Wear safety glasses in order to avoid eye damage.

  3. Dry the components with compressed air.
  4. Inspect the camshaft timing chain for binding or wear.

  5. Object Number: 188097  Size: SH

    Important: If the sprocket(s) must be replaced, replace both sprockets to ensure that timing chain centerline alignment is maintained.

  6. Inspect the camshaft and crankshaft sprockets for the following conditions:
  7. • Worn teeth (1)
    • Damaged teeth (2)
    • Chipped teeth (3)
    • Uneven wear on one edge of the teeth
    • Worn valleys between the sprocket teeth
    • Crankshaft sprocket keyway for wear