GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the left valve rocker arms. Refer to Valve Rocker Arm Replacement - Left Side .

  2. Object Number: 522867  Size: SH
  3. Remove the stationary hydraulic lash adjusters (SHLA) from the bores.
  4. Clean and inspect the valve lifters. Refer to Valve Lifters Cleaning and Inspection in Engine Mechanical - 4.0 L Unit Repair.

Installation Procedure


    Object Number: 240801  Size: SH

    Important: Do not stroke/cycle the stationary hydraulic lash adjuster plunger without oil in the lower pressure chamber.

  1. Fill the stationary hydraulic lash adjuster (SHLA) with clean engine oil GM P/N 12378006 or equivalent. Take precautions to prevent scratching the pivot sphere area (1) of the SHLA.

  2. Object Number: 522867  Size: SH
  3. Install the new SHLA's into the bores.
  4. Install the left valve rocker arms. Refer to Valve Rocker Arm Replacement - Left Side .