GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • J 42492-A (KM 421-A) Timing Belt Adjuster
    • KM-470-B Angular Torque Gage
    • J 45059 Angle Meter

Removal Procedure

    Warning: Refer to Battery Disconnect Warning in the Preface section.


    Object Number: 1241530  Size: SH
  1. Disconnect the negative battery cable.
  2. Disconnect the intake air temperature (IAT) sensor connector.
  3. Disconnect the air intake tube from the throttle body.
  4. Disconnect the breather tube from the valve cover.

  5. Object Number: 1241535  Size: SH
  6. Remove the air cleaner housing bolts.
  7. Remove the air cleaner housing.
  8. Remove the right front wheel. Refer to Tire and Wheel Removal and Installation.
  9. Remove the right front wheel well splash shield.
  10. Caution: Refer to Belt Dressing Caution in the Preface section.


    Object Number: 1241546  Size: SH
  11. Remove the serpentine accessory drive bolt. Refer to Power Steering Pump Hoses and Pipes Replacement.
  12. Remove the upper timing belt cover bolts.
  13. Remove the upper timing belt cover.

  14. Object Number: 1241552  Size: SH
  15. Remove the crankshaft pulley bolt.
  16. Remove the crankshaft pulley.
  17. Remove the lower timing belt cover bolts.
  18. Remove the lower timing belt cover.

  19. Object Number: 1241617  Size: SH
  20. Install the crankshaft pulley bolt.
  21. Using the crankshaft pulley bolt, rotate the crankshaft clockwise until the mark on the crankshaft gear is aligned with the notch at the bottom of the rear timing belt cover.

  22. Object Number: 1241553  Size: SH
  23. Slightly loosen the coolant pump retaining bolts.
  24. Using the J 42492-A  (1), rotate the coolant pump counterclockwise to release the tension on the timing belt.
  25. Remove the engine mount bracket. Refer to Engine Mount Replacement.
  26. Remove the timing belt.

Installation Procedure


    Object Number: 1241573  Size: SH
  1. Align the mark on the crankshaft gear to the notch on the bottom of the rear timing belt cover.
  2. Align the mark on the camshaft gear to the notch on the top of the rear timing belt cover.
  3. Install the timing belt.

  4. Object Number: 1241553  Size: SH
  5. Using the J 42492-A  (1), rotate the coolant pump clockwise to add the highest tension to the timing belt.
  6. Tighten the coolant pump retaining bolts loosely.

  7. Object Number: 1241610  Size: SH
  8. Align the adjust arm hole of the timing belt automatic tensioner to the hole in the timing belt automatic tensioner bracket.
  9. Insert a 4.5 mm driver through the adjust arm hole and the tensioner bracket hole.

  10. Object Number: 1241617  Size: SH
  11. Rotate the crankshaft 2 full turns clockwise using the crankshaft pulley bolt.
  12. Align the mark on the crankshaft gear to the notch at the bottom of the rear timing belt cover.

  13. Object Number: 1241553  Size: SH
  14. Remove the driver from the timing belt automatic tensioner.
  15. Slightly loosen the 3 coolant pump retaining bolts.
  16. Using the J 42492-A  (1), rotate the coolant pump.

  17. Object Number: 1241572  Size: SH
  18. Rotate the coolant pump until the adjust arm pointer of the timing belt automatic tensioner is aligned with the notch in the timing belt automatic tensioner bracket.
  19. Caution: Refer to Fastener Caution in the Preface section.

  20. Tighten the coolant pump retaining bolts.
  21. Tighten
    Tighten the coolant pump retaining bolts to 10 N·m (89 lb in).


    Object Number: 1241552  Size: SH
  22. Remove the crankshaft pulley bolt.
  23. Install the lower timing belt cover.
  24. Install the lower timing belt cover bolts.
  25. Tighten
    Tighten the lower timing belt cover bolts to 10 N·m (89 lb in).


    Object Number: 1241612  Size: SH
  26. Install the crankshaft pulley.
  27. Install the crankshaft pulley bolt.
  28. Tighten

        • Tighten the crankshaft pulley bolt to 95 N·m (70 lb ft) using a torque wrench.
        • Using the J 45059 or the KM-470-B , tighten the crankshaft pulley bolt another 30 degrees plus 15 degrees.

    Object Number: 1241546  Size: SH
  29. Install the upper timing belt cover.
  30. Install the upper timing belt cover bolts.
  31. Tighten
    Tighten the upper timing belt cover bolts to 10 N·m (89 lb in).

    Caution: Refer to Belt Dressing Caution in the Preface section.


    Object Number: 1241549  Size: SH
  32. Install the serpentine accessory drive belt.

  33. Object Number: 1241535  Size: SH
  34. Install the right front wheel well splash shield.
  35. Install the right front wheel. Refer to Tire and Wheel Removal and Installation.
  36. Install the air filter housing.
  37. Install the air filter housing bolts.
  38. Tighten
    Tighten the air filter housing bolts to 12 N·m (106 lb in).


    Object Number: 1241530  Size: SH
  39. Connect the air intake tube to the throttle body.
  40. Connect the breather tube to the valve cover.
  41. Connect the IAT sensor connector.
  42. Connect the negative battery cable.