GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1559860  Size: SH

    Important: 

       • Do not use the valve rocker arm cover gasket again. Install a NEW gasket during assembly.
       • Remove the ignition coils before cleaning the cover in solvent. Do not submerge the ignition coils in solvent.
       • Do not remove the oil fill tube from the covers, unless service is required.

  1. Inspect the oil fill tube (423) for a loose fit or damage.

  2. Object Number: 1408866  Size: SH
  3. Inspect the covers for the following conditions:
  4. • Scoring or damage to the gasket surfaces
    • Ventilation system passages for restrictions
    • Threaded bolt holes for damage or debris