Valve Rocker Arm and Valve Lash Adjuster Cleaning and Inspection

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Clean the valve rocker arms and valve lash adjusters in cleaning solvent.
Dry the valve rocker arms and valve lash adjusters with compressed air.
Inspect the valve rocker arms for the following conditions:
- 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.
  
  Fig 1: Inspecting Valve Rocker Arms
  Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Keep the valve rocker arms and valve lash adjusters in the order from where they where removed.
Inspect the valve lash adjusters for the following conditions:
- Excessive wear
- Clogging of the oil passage
- Damage
- Collapsed or spongy
  
  Fig 2: Inspecting Valve Lash Adjusters
  Courtesy of GENERAL MOTORS CORP.