GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39946 Crankshaft Rotation Socket


    Object Number: 53221  Size: SH
  1. Install the intermediate sprocket shaft and the retaining bolts.
  2. Tighten
    Tighten the intermediate shaft sprockets bolts to 10 N·m (89 lb in).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the crankshaft sprocket drive key. If necessary, tap the key in place with a small hammer until it bottoms on the crankshaft.

  4. Object Number: 52991  Size: SH
  5. Align the timing marks of the intermediate and crankshaft sprockets. The marks should be aligned vertically in the installed position.
  6. Install the primary timing chain on the drive sprockets.
  7. Make sure that piston number one is at top dead center (TDC) and the crankshaft keyway is approximately at the one o'clock position.
  8. Install the primary timing chain, intermediate, sprocket and crankshaft sprocket as an assembly onto their respective shafts. Use the J 39946 in order to align the crankshaft key with the drive sprocket.

  9. Object Number: 52990  Size: SH
  10. Install the intermediate sprocket retaining bolt.
  11. Tighten
    Tighten the intermediate sprocket shaft bolt to 60 N·m (44 lb ft).


    Object Number: 53004  Size: SH
  12. Collapse the primary drive chain tensioner using the following procedure:
  13. 8.1. Rotate the ratchet release lever counterclockwise and hold.
    8.2. Collapse the tensioner shoe and hold.
    8.3. Release the ratchet lever and slowly release the pressure on the shoe.

    Object Number: 52989  Size: SH
  14. As the ratchet lever moves to its first click, hold the tensioner shoe inward. Insert a pin through the hole in the release lever.
  15. The locked ratchet mechanism should hold the shoe in a collapsed position.

  16. Object Number: 53003  Size: SH

    Important: Make sure the tensioner release lever faces toward you before tightening.

  17. Install the primary drive chain tensioner and retaining bolts.
  18. Tighten
    Tighten the primary drive chain tensioner bolts to 25 N·m (18 lb ft).

  19. Remove the retaining pin allowing the tensioner shoe to extend.
  20. Check the timing marks to make sure they are aligned vertically.