GM Service Manual Online
For 1990-2009 cars only

    Object Number: 480551  Size: SH

    Important: Parts that are to be reused must be marked, sorted, and organized for assembly.

  1. Mark, sort, and organize the components for assembly.
  2. Caution: Wear safety glasses in order to avoid eye damage.

  3. Clean the components with cleaning solvent.
  4. Dry the components with compressed air.
  5. Inspect the valve rocker arm components for the following:
  6. • Valve rocker arm valve pushrod socket contact surface (1)
    • The contact surface must be smooth with no scoring or excessive wear.
    • Valve rocker arm roller pivot for binding or damage (2)
    • Valve rocker arm valve stem contact surface (3)
    • The contact surface should be smooth with no scoring or excessive wear.
    • Valve rocker arm bolt threads for damage (4)

    Object Number: 488857  Size: SH
  7. Inspect the valve pushrods for the following:
  8. • Restriction of the oil passage (1)
    • Wear or scoring of the end contact surfaces (2)
    • The end contact surfaces must be smooth with no scoring or excessive wear.
    • Shaft for bends (3)
    • Roll the valve pushrod on a flat surface to determine if the valve pushrod is bent.

    Object Number: 480553  Size: SH
  9. Inspect the valve rocker support for excessive wear or damage.