GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 738905  Size: SH
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  2. Remove the upper oil pan. Refer to Upper Oil Pan Replacement .
  3. Notice: Do not use an impact driver to remove or install the oil pump driven gear nut. Use of an impact driver may shear the oil pump drive gear pin in the crankshaft.

  4. While holding the secondary oil pump shaft with a hex driver, remove the oil pump driven gear nut.
  5. Remove the oil pump driven gear.

  6. Object Number: 738904  Size: SH
  7. Remove the oil pump drive gear and crankshaft sensor reluctor. Do not damage the crankshaft reluctor teeth.

  8. Object Number: 739296  Size: SH

    Important: Do not remove the reluctor from the oil pump drive gear unless replacing the reluctor or the oil pump drive gear. The reluctor is timed to the gear and once removed the correct timing will be lost.

  9. Remove the crankshaft reluctor to oil pump drive gear bolts.
  10. Inspect the crankshaft reluctor for the damage, bent teeth, being bent or warped.
  11. Inspect the oil pump drive gear for damaged or worn teeth.
  12. Inspect the oil pump drive gear crankshaft pin for wear.
  13. Inspect the groove of the crankshaft pin in the oil pump drive gear for wear.
  14. Replace any parts that are damaged or worn.

Installation Procedure


    Object Number: 739295  Size: SH

    Important: The crankshaft reluctor and the oil pump drive gear are timed at the factory. In order to re-establish proper timing, install knock pins in the oil pump drive gear if the crankshaft reluctor was removed from the oil pump drive gear. The knock pins are available through the parts department.

  1. Install the knock pins in the oil pump drive gear to a height of 4.5-5.5 mm (0.177-0.217 in)

  2. Object Number: 739296  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the crankshaft reluctor on the oil pump drive gear. Ensure the reluctor is aligned on the knock pins.
  4. Install the crankshaft reluctor bolts.
  5. Tighten
    Tighten the bolts to 8 N·m (71 lb in).


    Object Number: 738904  Size: SH

    Important: Do not damage the teeth on the crankshaft reluctor.

  6. Install the oil pump drive gear and reluctor to the crankshaft.

  7. Object Number: 738905  Size: SH
  8. Install the oil pump driven gear.
  9. Notice: Do not use an impact driver to remove or install the oil pump driven gear nut. Use of an impact driver may shear the oil pump drive gear pin in the crankshaft.

  10. While holding the secondary oil pump shaft with a hex driver, install the oil pump driven gear nut.
  11. Tighten
    Tighten the nut to 100 N·m (74 lb ft).

  12. Install the upper oil pan. Refer to Upper Oil Pan Replacement .
  13. Install the engine front cover. Refer to Engine Front Cover Replacement .