GM Service Manual Online
For 1990-2009 cars only

    Object Number: 864125  Size: SH
  1. Install the pump driven gear with chamfered side down. Chamfer is on the outer diameter of the gear.
  2. Install the pump drive gear.

  3. Object Number: 864127  Size: SH
  4. Using a depth micrometer, measure pump hosing face height to drive gear face and driven gear face height. If equipment is not available, place straight edge across pump face. Check drive gear face to straight edge clearance and check driven gear to straight edge clearance.
  5. Clearance

        • Drive gear clearance standard 0.012-0.041 mm (0.0004-0.0016 in).
        • Driven gear clearance standard 0.012-0.041 mm (0.0004-0.0016 in).

    Object Number: 864131  Size: SH
  6. Measure driven gear-to-pump housing clearance.
  7. Clearance
    Standard 0.064-0.139 mm (0.0025-0.0055 in).


    Object Number: 864138  Size: SH
  8. Measure driven gear-to-crescent clearance.
  9. Clearance
    Standard 0.191-0.341 mm (0.0075-0.0134 in)


    Object Number: 864160  Size: SH
  10. Measure drive gear-to-crescent clearance.
  11. Clearance
    Standard 0.128-0.278 mm (0.0050-0.0109 in)


    Object Number: 864163  Size: SH
  12. Clean and install the lube relief valve, spring, and retainer.
  13. Install the pump wear plate. Make sure the surface is clean.