GM Service Manual Online
For 1990-2009 cars only

Tools Required

EN-47719 Tensioner Compressor

Removal Procedure


    Object Number: 1557849  Size: SH
  1. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  2. Align the crankshaft timing mark (1) to the timing mark on the bottom of the timing chain tensioner (2).
  3. Align the timing mark on the camshaft gear (3) with the timing mark on top of the timing chain tensioner (4).

  4. Object Number: 1557703  Size: SH
  5. Remove the camshaft sprocket bolts.
  6. Remove the timing chain, camshaft, and crankshaft sprockets.

  7. Object Number: 1557708  Size: SH
  8. Remove the timing chain tensioner bolts.
  9. Remove the timing chain tensioner.

  10. Object Number: 1608915  Size: SH
  11. Remove and discard the camshaft position actuator filter (1) from the end of the camshaft.

Installation Procedure


    Object Number: 1608915  Size: SH

    Important: Always install a NEW camshaft position actuator filter anytime the camshaft position actuator is removed.

  1. Install a NEW camshaft position actuator filter (1) to the end of the camshaft.

  2. Object Number: 760405  Size: SH
  3. Install the crankshaft sprocket.
  4. Apply prelube to the crankshaft sprocket thrust surface. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  5. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1557846  Size: SH
  6. Install the timing chain tensioner.
  7. Install the timing chain tensioner bolts.
  8. Tighten
    Tighten the bolts 21 N·m (15 lb ft).


    Object Number: 1557847  Size: SH
  9. Using the EN-47719 , fully collapse the tensioner, and place the tensioner retaining pin into the retaining hole (1).

  10. Object Number: 1557849  Size: SH
  11. Align the crankshaft timing mark (1) to the timing mark on the bottom of the timing chain tensioner (2).
  12. Hold the camshaft sprocket with the timing chain hanging down and install the timing chain to the crankshaft gear.
  13. Align the timing mark on the camshaft gear (3) with the timing mark on top of the timing chain tensioner (4).

  14. Object Number: 1557703  Size: SH
  15. Align the dowel in the camshaft sprocket with the dowel hole in the camshaft.
  16. Draw the camshaft sprocket onto the camshaft using the mounting bolts.
  17. Tighten
    Tighten the bolts 16 N·m (12 lb ft).

  18. Remove the retaining pin from the timing chain tensioner in order to make the tensioner active.
  19. Coat the crankshaft and camshaft sprockets with clean engine oil.
  20. Install the engine front cover. Refer to Engine Front Cover Replacement .