GM Service Manual Online
For 1990-2009 cars only

Timing Chain and Sprocket Installation Camshaft


    Object Number: 466584  Size: SH
  1. Ensure that the crankshaft keyway is aligned with the mark on the engine block.
  2. Ensure that the yellow link of the crankshaft timing chain (2) is aligned with the crankshaft timing mark (1).

  3. Object Number: 466597  Size: SH
  4. Ensure that the idler sprocket arrow (2) is pointing upward.
  5. Ensure that the dowel pins (1) of the camshafts are aligned with the notches (3) on the cylinder head.

  6. Object Number: 466599  Size: SH
  7. Align the yellow link (1) of the camshaft timing chain with the arrows (2) on the idler sprocket.

  8. Object Number: 466604  Size: SH
  9. Align the dark blue link (1) of the camshaft timing chain with the arrow (2,3) on the camshaft sprockets.
  10. Install the camshaft timing sprockets and chain.

  11. Object Number: 466581  Size: SH

    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.

  12. Install the camshaft sprocket bolts (1).
  13. Tighten
    Tighten the bolts to 80 N·m (58 lb ft).


    Object Number: 464756  Size: SH
  14. Compress the camshaft tensioner plunger into the body. Insert a retainer (a paper clip or similar tool) through the hole in the body in order to hold the plunger in place.

  15. Object Number: 466579  Size: SH
  16. Install the gasket and the camshaft timing chain tensioner.
  17. Tighten

        • Tighten the bolts (1) to 11 N·m (8 lb ft).
        • Tighten the nut (2) to 45 N·m (33 lb ft).
  18. Remove the retainer from the tensioner.

  19. Object Number: 466546  Size: SH
  20. Turn the crankshaft 2 revolutions realigning the keyway on the crankshaft (5) with the timing mark on the engine block (4).
  21. Ensure that the guide pins on the camshafts (1) are in line with the notches on the cylinder head (6).
  22. Apply engine oil to the following:
  23. • The timing chains
    • The tensioner
    • The guides
    • The sprockets

Timing Chain and Sprocket Installation Crankshaft


    Object Number: 464735  Size: SH
  1. Inspect that the timing mark on the engine block (1) is aligned with the crankshaft keyway.
  2. Install the crankshaft sprocket (2).

  3. Object Number: 466653  Size: SH
  4. Apply engine oil to the idler sprocket bushing.
  5. Install the timing chain to the idler sprocket by aligning the dark blue link (1) of the timing chain with the mark on the sprocket (2).

  6. Object Number: 468065  Size: SH
  7. Install the timing chain to the crankshaft sprocket by aligning the yellow link (4) of the chain with the mark on the crankshaft sprocket (3).
  8. Install the idler sprocket.

  9. Object Number: 625579  Size: SH

    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.

  10. Install the timing chain fixed guide (2).
  11. Tighten
    Tighten the 2 bolts to 9 N·m (62 lb in).

  12. Install the timing chain adjustable guide (1).
  13. Tighten
    Tighten the bolt to 25 N·m (19 lb ft).


    Object Number: 464753  Size: SH
  14. Hold back the latch, compress the plunger and install a retainer (a paper clip or similar tool) to hold the plunger in place.

  15. Object Number: 464755  Size: SH
  16. Install the timing chain tensioner.
  17. Tighten
    Tighten the 2 bolts (1) to 11 N·m (97 lb in).

  18. Remove the retainer.

  19. Object Number: 466584  Size: SH
  20. Ensure that the crankshaft keyway is aligned with the mark on the engine block.
  21. Ensure that the yellow link of the crankshaft timing chain (2) is aligned with the crankshaft timing mark (1).

  22. Object Number: 466597  Size: SH
  23. Ensure that the guide pins (1) of the camshafts are aligned with the notches (3) on the cylinder head.
  24. Ensure that the idler sprocket arrow (2) is pointing upward.
  25. Ensure that the dark blue link of the timing chain is aligned with the mark on the idler sprocket.