GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 8001 Dial Indicator
    • J 21465-13 Drive Handle Extension
    • J 36660-A Torque Angle Meter
    • J 36995 Balance Shaft Bushing Installer
    • J 36996 Balance Shaft Installer
  1. Ensure that no gasket material remains on the rear main oil seal housing.

  2. Object Number: 36707  Size: SH
  3. Dip the bushing in clean engine oil.
  4. Important: 

       • The J 36995 ensures that the rear bushing is installed to the correct depth.
       • The bushing is properly installed when the J 36995 fully contacts the balance shaft bore or the cylinder block/transaxle mounting flange.

  5. Use the balance shaft bushing installers in order to install the balance shaft rear bushing.
  6. Remove the J 36995 .
  7. Dip the front balance shaft bearing into clean engine oil.

  8. Object Number: 36710  Size: SH
  9. Use the J 36660-A and the J 36996 in order to install the balance shaft into the block.

  10. Object Number: 42237  Size: SH
  11. Temporarily install the balance shaft bearing retainer. Temporarily install the balance shaft bearing retainer bolts.
  12. Install the balance shaft drive gear.
  13. Notice: This bolt is designed to permanently stretch when tightened, and therefore MUST be replaced anytime it is removed. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

  14. Install the balance shaft drive gear bolt.
  15. Tighten
    Tighten the bolt to 22 N·m (16 lb ft). Use the J 36660-A in order to tighten the bolt an additional 70 degrees.

    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.

  16. Install the rear main oil seal housing.

  17. Object Number: 38470  Size: SH
  18. Measure the balance shaft end play. End play must not exceed 0.028 mm (0.008 in).

  19. Object Number: 38472  Size: SH
  20. Measure the balance shaft radial play at the rear. Radial play must be between 0.0127-0.119 mm (0.0005-0.0047 in).
  21. Temporarily install the camshaft sprocket.
  22. Turn the camshaft so that the timing mark on the camshaft sprocket is straight down.
  23. Remove the camshaft sprocket and camshaft gear.
  24. Turn the balance shaft so that the timing mark on the gear points straight down.
  25. Install the camshaft gear.
  26. Align the marks on the balance shaft gear and the camshaft gear. Do this by turning the balance shaft.
  27. Turn the crankshaft so that the number one piston is at top dead center.
  28. Install the timing chain.
  29. Install the camshaft sprocket.

  30. Object Number: 38477  Size: SH
  31. Measure gear lash at four places. Measure every ¼ turn. Gear lash must be between 0.050-0.127 mm (0.002-0.005 in).
  32. Install the balance shaft retainer.
  33. Install the balance shaft retainer bolts.
  34. Tighten
    Tighten the bolts to 30 N·m (22 lb ft).