GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 TrailBlazer - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.2L 🢒 Oil Pump Replacement

Removal Procedure
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement.

    2. Object Number: 659575 Size: SH
  2. Remove the oil pump cover bolts.
  3. Remove the oil pump cover.
  4. Mark the inner and the outer gears in relation to the oil pump housing.
  5. Remove the inner and the outer oil pump gears.
  6. Remove the oil pump pressure relief valve plug.
  7. Remove the oil pump pressure relief valve and the spring.

Installation Procedure

    Object Number: 659575 Size: SH
  1. Install the oil pump pressure relief valve and the spring.

    2. Caution: Refer to Fastener Caution in the Preface section.

  2. Install the oil pump pressure relief valve plug and tighten to 14 N·m (124 lb in).
  3. Install the oil pump outer and inner gears as removed.
  4. Install the oil pump cover.
  5. Install the oil pump cover bolts 10 N·m (89 lb in).
  6. Install the front cover. Refer to Engine Front Cover Replacement.