GM Service Manual Online
For 1990-2009 cars only

Tools Required

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

Removal Procedure

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


    Object Number: 1263236  Size: SH
  1. Disconnect the negative battery cable.
  2. Remove the air filter housing bolts.
  3. Remove the air filter housing assembly.
  4. Disconnect the intake air temperature (IAT) sensor connector.
  5. Remove the air cleaner outlet hose from the throttle body.
  6. Remove the breather tube from the camshaft cover.
  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: 1291265  Size: SH
  20. Rotate the crankshaft at least one full turn clockwise using the crankshaft pulley bolt.

  21. Object Number: 1291229  Size: SH
  22. Slightly loosen the water pump retaining bolts.
  23. Rotate the water pump clockwise using the J 42492-A .
  24. Remove the right engine mount. Refer to Engine Mount Replacement .

  25. Object Number: 1291264  Size: SH
  26. Remove the timing belt.

Installation Procedure


    Object Number: 1291245  Size: SH
  1. Align the timing mark on the crankshaft gear with the notch on the bottom of the rear timing belt cover.
  2. Align the timing marks on the camshaft gears.

  3. Object Number: 1291267  Size: SH
  4. Install the timing belt.
  5. Install the right engine mount bracket. Refer to Engine Mount Replacement .

  6. Object Number: 1291259  Size: SH
  7. Rotate the water pump clockwise using the J 42492-A .
  8. 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.

  9. Object Number: 1291261  Size: SH
  10. Tighten the water pump retaining bolts.
  11. Rotate the crankshaft 2 full turns clockwise using the crankshaft pulley.
  12. Loosen the water pump retaining bolts.
  13. 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.
  14. Notice: Refer to Fastener Notice in the Preface section.


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

  17. Remove the crankshaft pulley bolt.
  18. Install the upper and lower front timing belt covers.
  19. Install the upper and lower front timing belt cover bolts.
  20. Tighten
    Tighten the front timing belt cover bolts to 10 N·m (89 lb in).


    Object Number: 1291248  Size: SH
  21. Install the crankshaft pulley.
  22. Install the crankshaft pulley bolt.
  23. Tighten
    Tighten the crankshaft pulley bolt to 20 N·m (15 lb ft) and retighten 30 degrees plus 15 degrees.

  24. Install the serpentine accessory drive belt. Refer to Power Steering Pump Belt Replacement .
  25. Install the right front wheel well splash shield.
  26. Install the right front wheel. Refer to Tire and Wheel Removal and Installation .
  27. Install the air cleaner housing.
  28. Install the air cleaner housing bolts.
  29. Tighten
    Tighten the air cleaner housing bolts to 10 N·m (89 lb in).


    Object Number: 1263236  Size: SH
  30. Connect the air cleaner outlet hose to the throttle body.
  31. Connect the breather tube to the camshaft cover.
  32. Connect the negative battery cable.