GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 10937  Size: SH
  1. Remove the engine oil pan. Refer to Oil Pan Replacement .
  2. Disconnect the crankshaft position (CKP) sensor electrical connector.
  3. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement .
  4. Remove the water pump. Refer to Water Pump Replacement in Engine Cooling.
  5. Remove the CKP sensor. Refer to Crankshaft Position Sensor Replacement in Engine Controls - 4.3L.

  6. Object Number: 387759  Size: SH
  7. Remove the crankshaft position sensor seal (O-ring).
  8. Discard the crankshaft position sensor seal (O-ring).

  9. Object Number: 480539  Size: SH
  10. Remove the engine front cover bolts.
  11. Important: After the composite engine front cover is removed do not reinstall the engine front cover. Always install a NEW engine front cover.

  12. Remove the engine front cover.
  13. Discard the engine front cover.
  14. Clean all sealing surfaces.

Installation Procedure


    Object Number: 480539  Size: SH

    Important: Once the composite engine front cover is removed DO NOT reinstall the engine front cover. Always install a NEW engine front cover.

  1. Install the NEW engine front cover.
  2. 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 engine front cover bolts.
  4. Tighten
    Tighten the bolts to 12 N·m (106 lb in).


    Object Number: 387759  Size: SH

    Important: DO NOT reuse the original crankshaft position sensor seal (O-ring). When installing the crankshaft position sensor be sure the crankshaft position sensor is fully seated and held stationary in the engine front cover crankshaft position sensor bore. A crankshaft position sensor that is not completely seated will cock in the engine front cover and may result in erratic engine operation.

  5. Lubricate the NEW crankshaft position sensor seal (O-ring) with clean engine oil.
  6. Install the NEW crankshaft position sensor seal (O-ring) onto the crankshaft position sensor.
  7. Install the CKP sensor. Refer to Crankshaft Position Sensor Replacement in Engine Controls - 4.3L.

  8. Object Number: 10937  Size: SH
  9. Install the engine oil pan. Refer to Oil Pan Replacement .
  10. Connect the CKP sensor electrical connector.
  11. Install the water pump. Refer to Water Pump Replacement in Engine Cooling.
  12. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement .