GM Service Manual Online
For 1990-2009 cars only

    Object Number: 20748  Size: SH
  1. Inspect the control valve body for the following:
  2. • Porosity
    • A worn, scored, or damaged pump pocket
    • Interconnected oil passages
    • Damaged machine surfaces

    Object Number: 20749  Size: SH
  3. Inspect the pump components for the following:
  4. • A worn, scored, or gouged pump slide
    • Cracks, wear, or damage to the rotor or to the vanes
    • Cuts or damage to the seals