GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 44212 Camshaft Holding Tool


    Object Number: 685348  Size: SH
  1. Install the right secondary camshaft drive chain guide.

  2. Object Number: 685347  Size: SH
  3. Loosely install the lower right secondary camshaft drive chain guide bolt.

  4. Object Number: 685343  Size: SH
  5. Install the right secondary camshaft drive chain shoe.
  6. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 685338  Size: SH
  7. Install the right secondary camshaft drive chain shoe bolt.
  8. Tighten
    Tighten the right secondary camshaft drive chain shoe bolt to 25 N·m (18 lb ft).


    Object Number: 685335  Size: SH
  9. Install the right secondary camshaft drive chain by sliding the chain down through the right cylinder head and placing the chain on the end of the camshafts.
  10. Route the right secondary camshaft drive chain around the outer row of the intermediate drive chain sprocket teeth.

  11. Object Number: 1564250  Size: SH
  12. Install the right intake and exhaust camshaft sprockets into the right secondary camshaft drive chain.

  13. Object Number: 1564251  Size: SH

    Important: Do not use the stamped indicator marks for perpendicular alignment when installing the timing chain.

  14. Install the right intake and exhaust camshafts sprockets onto the camshafts. The camshaft sprocket slot marked "RI" which indicates right intake, engages the intake camshaft pin and the camshaft sprocket slot marked "RE" which indicates right exhaust, engages the exhaust camshaft pin.

  15. Object Number: 53007  Size: SH
  16. If necessary, use an open wrench on the hex cast near the front of each camshaft to help align the sprocket slot to the camshaft pin.
  17. Loosely install the right intake and exhaust camshaft sprocket bolts.

  18. Object Number: 1564253  Size: SH
  19. Ensure the perpendicular alignment of the right intake and exhaust camshaft sprocket slots and camshaft pins to the cylinder head.

  20. Object Number: 650538  Size: SH
  21. Install the J 44212 to the right cylinder head camshafts.

  22. Object Number: 1564249  Size: SH
  23. Install the upper right secondary camshaft drive chain guide bolt.
  24. Tighten
    Tighten BOTH the upper and lower right secondary camshaft drive chain guide bolts to 25 N·m (18 lb ft).


    Object Number: 53004  Size: SH
  25. Collapse the right secondary camshaft drive chain tensioner using the following procedure:
  26. 14.1. Rotate the ratchet release lever counter-clockwise and hold.
    14.2. Collapse the right secondary camshaft drive chain tensioner shoe and hold.
    14.3. Release the ratchet lever and slowly release the pressure on the shoe.
  27. When the ratchet lever moves to the first detent a click should be heard and felt. Insert a pin through the hole in the release lever in order to lock the right secondary camshaft drive chain tensioner shoe in the collapsed position.

  28. Object Number: 1564248  Size: SH

    Important: Ensure the right secondary camshaft drive chain tensioner release lever is facing out.

  29. Install the right secondary camshaft drive chain tensioner.
  30. Install the right secondary camshaft drive chain tensioner bolts.
  31. Tighten
    Tighten the right secondary camshaft drive chain tensioner bolts to 25 N·m (18 lb ft).

  32. Remove pin from right secondary camshaft drive chain tensioner lever.

  33. Object Number: 52099  Size: SH
  34. Ensure the correct alignment of all secondary timing components.

  35. Object Number: 517185  Size: SH
  36. Ensure the correct alignment of all primary timing components (1, 2).
  37. Notice: Refer to Torque Reaction Against Timing Drive Chain Notice in the Preface section.


    Object Number: 53007  Size: SH
  38. Tighten ALL camshaft sprocket bolts. Use the hex cast into each camshaft to prevent engine rotation and provide leverage.
  39. Tighten
    Tighten ALL camshaft sprocket bolts to 120 N·m (90 lb ft).


    Object Number: 1564247  Size: SH
  40. Install the cylinder head core hole plugs located in the cylinder heads. Ensure the O-ring seal is on each cylinder head core hole plug.
  41. Tighten
    Tighten the cylinder head core hole plugs to 4.5 N·m (39 lb in).