GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 42492-A (KM-421-A) Timing Belt Adjuster

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


    Object Number: 1291257  Size: SH
  1. Disconnect the negative battery cable.
  2. Remove the air cleaner outlet hose from the throttle body.
  3. Remove the breather tube from the camshaft cover.

  4. Object Number: 1291219  Size: SH
  5. Remove the air cleaner housing bolts.
  6. Remove the air cleaner housing.
  7. Remove the right front wheel. Refer to Tire and Wheel Removal and Installation.
  8. Remove the right front wheel well splash shield.

  9. Object Number: 1291228  Size: SH
  10. Remove the serpentine accessory drive belt. Refer to Power Steering Pump Belt Replacement.
  11. Remove the crankshaft pulley bolt.
  12. Remove the crankshaft pulley.

  13. Object Number: 1291258  Size: SH
  14. Remove the upper front timing belt cover bolts.
  15. Remove the upper front timing belt cover.
  16. Remove the lower front timing belt cover bolts.
  17. Remove the lower front timing belt cover.
  18. Install the crankshaft pulley bolt.

  19. Object Number: 1291245  Size: SH
  20. Rotate the crankshaft at least one full turn clockwise using the crankshaft pulley bolt.
  21. Align the mark on the crankshaft gear with the notch at the bottom of the rear timing belt cover.
  22. Align the camshaft gear timing marks.

  23. Object Number: 1291229  Size: SH
  24. Slightly loosen the water pump retaining bolts.
  25. Rotate the water pump clockwise using the J 42492-A .

  26. Object Number: 1291259  Size: SH
  27. Rotate the water pump clockwise until the adjust arm pointer of the timing belt automatic tensioner is aligned with the notch in the timing belt automatic tensioner bracket.

  28. Object Number: 1291248  Size: SH
  29. Tighten the water pump retaining bolts.
  30. Rotate the crankshaft two full turns clockwise using the crankshaft pulley.
  31. Loosen the water pump retaining bolts.

  32. Object Number: 1291261  Size: SH
  33. Using the J 42492-A , rotate the water pump until the adjust arm pointer of the timing belt automatic tensioner is aligned with the pointer on the timing belt automatic tensioner bracket.
  34. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1291262  Size: SH
  35. Tighten the water pump retaining bolts.
  36. Tighten
    Tighten the water pump retaining bolts to 10 N·m (89 lb in).

  37. Remove the crankshaft pulley bolt.
  38. Install the upper and lower front timing belt covers.
  39. Install the upper and lower front timing belt cover bolts.
  40. Tighten
    Tighten the front timing belt cover bolts to 10 N·m (89 lb in).


    Object Number: 1291248  Size: SH
  41. Install the crankshaft pulley.
  42. Install the crankshaft pulley bolt.
  43. Tighten
    Tighten the crankshaft pulley bolt to 95 N·m (70 lb ft ) and retighten 30 degrees plus 15 degrees.

  44. Install the serpentine accessory drive belt. Refer to Power Steering Pump Belt Replacement.

  45. Object Number: 1291219  Size: SH
  46. Install the right front wheel well splash shield.
  47. Install the right front wheel. Refer to Tire and Wheel Removal and Installation.
  48. Install the air cleaner housing.
  49. Install the air cleaner housing bolts.
  50. Tighten
    Tighten the air cleaner housing bolts to 10 N·m (89 lb in).


    Object Number: 1291257  Size: SH
  51. Connect the air cleaner outlet hose to the throttle body.
  52. Connect the breather tube to the camshaft cover.
  53. Connect the negative battery cable.