GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the engine front cover. Refer to Engine Front Cover Replacement .

  2. Object Number: 54291  Size: SH
  3. Remove the camshaft sprocket bolt.
  4. Remove the camshaft sprocket and timing chain.

  5. Object Number: 760405  Size: SH
  6. Remove the crankshaft sprocket.

  7. Object Number: 59271  Size: SH
  8. Remove the timing chain dampener bolts.
  9. Remove the timing chain dampener.

Installation Procedure


    Object Number: 760405  Size: SH
  1. Install the crankshaft sprocket .
  2. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or the equivalent to the crankshaft sprocket thrust surface.

  3. Object Number: 59271  Size: SH
  4. Install the timing chain dampener.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the timing chain dampener bolts.
  7. Tighten
    Tighten the bolt to 21 N·m (15 lb ft).


    Object Number: 187021  Size: SH
  8. Align the crankshaft timing mark (2) to the timing mark on the bottom of the timing chain dampener (1).
  9. Hold the camshaft sprocket with the timing chain hanging down and install the timing chain to the crankshaft gear.
  10. Align the timing mark on the camshaft gear (4) with the timing mark on top of the timing chain dampener (3).

  11. Object Number: 54291  Size: SH
  12. Align the dowel in the camshaft with the dowel hole in the camshaft sprocket.
  13. Draw the camshaft sprocket onto the camshaft using the mounting bolt.
  14. Coat the crankshaft and camshaft sprocket with engine oil.
  15. Tighten
    Tighten the bolt to 140 N·m (103 lb ft).

  16. Install the engine front cover. Refer to Engine Front Cover Replacement .