GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the engine oil pan. Refer to Oil Pan Replacement .

  2. Object Number: 33654  Size: SH
  3. Remove the balance shaft chain cover.

  4. Object Number: 33657  Size: SH
  5. Remove the balance shaft chain tensioner assembly.
  6. Remove the oil pump cover.
  7. Remove the oil pump.

Installation Procedure

  1. Install the oil pump.
  2. Time the balance shaft chain. Refer to Balance Shaft to Engine Timing
  3. 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.

  4. Install the oil pump cover to the balance shaft housing.
  5. Tighten

        • Tighten the pump to housing long bolts to 12 N·m (106 lb in).
        • Tighten the pump to housing short bolts to 10 N·m (89 lb in).

    Object Number: 61198  Size: SH
  6. Install the balance shaft chain tensioner.
  7. Important: You must use a brass feeler gauge in order to obtain correct measurements. A steel gauge will not conform to the guide and will not provide correct measurements.

  8. Adjust the balance shaft drive chain tension by inserting a 1 mm (0.040 in) brass feeler gauge between the chain guide and the chain.
  9. Press the guide against the chain using about 13 N·m (10 lb ft) of force.
  10. Tighten the chain tensioner.
  11. Tighten
    Tighten the timing chain tensioner bolt to 10 N·m (89 lb in).

  12. Install the oil pan gasket and the oil pan. Refer to Oil Pan Replacement .