GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN 46112 Tensioner Retraction Pins
    • J 45027 Tensioner Tool

    Object Number: 1306381  Size: SH
  1. Ensure that the left secondary camshaft drive chain tensioner (2) is being installed.

  2. Object Number: 1306382  Size: SH
  3. Using the J 45027 , reset the left secondary camshaft drive chain tensioner plunger.

  4. Object Number: 1306383  Size: SH
  5. Install the plunger into the left secondary camshaft drive chain tensioner body.

  6. Object Number: 1306384  Size: SH
  7. Compress the plunger into the body and lock the left secondary camshaft drive chain tensioner by inserting the EN 46112 into the access hole in the side of the left secondary camshaft drive chain tensioner body.
  8. Slowly release pressure on the left secondary camshaft drive chain tensioner. The left secondary camshaft drive chain tensioner should remain compressed.

  9. Object Number: 1306386  Size: SH
  10. Install a NEW left secondary camshaft drive chain tensioner gasket to the left secondary camshaft drive chain tensioner.
  11. Install the left secondary camshaft drive chain tensioner bolts through the left secondary camshaft drive chain tensioner and gasket.
  12. Ensure the left secondary camshaft drive chain tensioner mounting surface on the left cylinder head does not have any burrs or defects that would degrade the sealing of the NEW left secondary camshaft drive chain tensioner gasket.

  13. Object Number: 1579012  Size: SH
  14. Place the left secondary camshaft drive chain tensioner into position and loosely install the bolts to the block.
  15. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1306387  Size: SH
  16. Verify the proper placement of the left secondary camshaft drive chain tensioner gasket tab (1).
  17. Tighten

    1. First Pass
    2. Tighten the left secondary camshaft drive chain tensioner bolts to 5 N·m (44 lb in).

    3. Final Pass
    4. Tighten the left secondary camshaft drive chain tensioner bolts to 23 N·m (17 lb ft).


    Object Number: 1306389  Size: SH
  18. Release the left secondary camshaft drive chain tensioner by pulling out the EN 46112 and unlocking the tensioner plunger.

  19. Object Number: 1586261  Size: SH
  20. Verify the left secondary camshaft drive chain timing mark alignments (1-6). Also refer to Camshaft Timing Drive Chain Alignment Diagram - Stage One.