GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the camshaft drive sprockets. Refer to Camshaft Drive Sprocket Replacement .

  2. Object Number: 833133  Size: SH
  3. Remove the timing belt tensioner locking nut, washer and pulley.

  4. Object Number: 785857  Size: SH
  5. Disconnect the knock sensor pigtail (1) from the bracket.
  6. Important: The knock sensor pigtail is guided past the rear timing belt cover by several retaining clips.

    Note the positioning of the knock sensor pigtail.

  7. Remove the knock sensor pigtail from the retaining clips on the rear timing belt cover.

  8. Object Number: 832743  Size: SH
  9. Remove the rear timing belt cover bolts.
  10. Remove the rear timing belt cover threaded pin (1).
  11. Remove the rear timing belt cover.

Installation Procedure


    Object Number: 832743  Size: SH

    Important: Ensure the knock sensor pigtail does not get pinched between the rear timing belt cover and the engine.

  1. Position the rear timing belt cover to the engine.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the rear timing belt cover bolts.
  4. Tighten
    Tighten the rear timing belt cover bolts to 8 N·m (71 lb in).

  5. Coat the threaded pin (1) with thread locking compound, GM P/N 12345382 (Canadian P/N 10953489), or equivalent.
  6. Install the rear timing belt cover threaded pin (1).
  7. Tighten
    Tighten the rear timing belt cover threaded pin to 10 N·m (89 lb in).


    Object Number: 785857  Size: SH

    Important: The knock sensor pigtail is guided past the rear timing belt cover by several retaining clips.

    Route the knock sensor pigtail as noted during removal.

  8. Install the knock sensor pigtail into the retaining clips. Ensure that the pigtail does not contact any moving parts.
  9. Connect the knock sensor pigtail (1) to the bracket.

  10. Object Number: 833133  Size: SH
  11. Install the timing belt tensioner pulley, washer and locking nut.
  12. The locking nut will be tighten to specifications after all final adjustments are made.

  13. Install the camshaft drive sprockets. Refer to Camshaft Drive Sprocket Replacement .