GM Service Manual Online
For 1990-2009 cars only

    Object Number: 637697  Size: SH
  1. Clean the valve rocker arms and valve lash adjusters in cleaning solvent.
  2. Dry the valve rocker arms and valve lash adjusters with compressed air.
  3. Inspect the valve rocker arms for the following conditions:
  4. • Excessive wear at the valve contact or valve lash adjuster socket area
    • A loose or damaged pin
    • A worn or damaged roller. The roller should rotate freely with no binding or roughness.

    Object Number: 637696  Size: SH

    Important: Keep the valve rocker arms and valve lash adjusters in the order from where they where removed.

  5. Inspect the valve lash adjusters for the following conditions:
  6. • Excessive wear
    • Clogging of the oil passage
    • Damage
    • Collapsed or spongy