GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN 46330 Timing Chain Tensioner Retaining Pin
    • J 8433 Puller Bar
    • J 41478 Crankshaft Front Oil Seal Installer
    • J 41558 Crankshaft Sprocket Remover
    • J 41665 Crankshaft Balancer and Sprocket Installer
    • J 41816-2 Crankshaft End Protector
    • J 42386-A Flywheel Holding Tool
    • J 45059 Angle Meter

Removal Procedure


    Object Number: 1658136  Size: SH
  1. Remove the oil pump. Refer to Oil Pump, Screen, and Crankshaft Oil Deflector Replacement.
  2. Remove the starter motor. Refer to Starter Motor Replacement.
  3. Caution: Refer to Fastener Caution in the Preface section.

    Note: Ensure that the teeth of the J 42386-A mesh with the teeth of the engine flywheel.

  4. Install the J 42386-A  (1) and bolts. Use one M10-1.5 x 120 mm and one M10-1.5 x 45 mm bolt for proper tool operation.
  5. Tighten
    Tighten the J 42386-A bolts to 50 N·m (37 lb ft).


    Object Number: 1658175  Size: SH
  6. Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned.
  7. Caution: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

  8. Remove the camshaft sprocket bolt (206).
  9. Remove the camshaft sprocket (205) and timing chain (208).

  10. Object Number: 1658178  Size: SH
  11. Remove the timing chain tension bolts (231) and tensioner (232).

  12. Object Number: 1658180  Size: SH
  13. Using the J 41816-2  (1), the J 41558  (2), bolts (3) and the J 8433  (4) in order to remove the crankshaft sprocket.

  14. Object Number: 1658182  Size: SH
  15. Remove the crankshaft sprocket (207).

  16. Object Number: 156149  Size: SH
  17. Remove the crankshaft sprocket key, if required.

Installation Procedure


    Object Number: 156149  Size: SH
  1. Install the key into the crankshaft keyway, if previously removed.

  2. Object Number: 1272887  Size: SH
  3. Tap the key (122) into the keyway until both ends of the key bottom onto the crankshaft.

  4. Object Number: 1658182  Size: SH
  5. Install the crankshaft sprocket (207) onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway.

  6. Object Number: 1658237  Size: SH
  7. Use the J 41478  (1) and the J 41665  (2) in order to install the crankshaft sprocket. Install the sprocket onto the crankshaft until fully seated against the crankshaft flange.

  8. Object Number: 1658249  Size: SH
  9. Compress the timing chain tensioner guide and install the EN 46330 .
  10. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1658251  Size: SH
  11. Install the timing chain tensioner (232) and bolts (231).
  12. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 1658265  Size: SH

    Note: 

       • The sprocket teeth and timing chain must mesh.
       • The camshaft and the crankshaft sprocket alignment marks MUST be aligned properly.

  13. Position the camshaft sprocket (205) so the timing mark is in the 6 o'clock position.
  14. Install the camshaft sprocket (205), timing chain (208), and bolt (206).

  15. Object Number: 1658268  Size: SH
  16. Inspect the sprockets for proper alignment. The mark on the camshaft sprocket (1) should be located in the 6 o'clock position and the mark on the crankshaft sprocket (2) should be located in the 12 o'clock position.

  17. Object Number: 1658271  Size: SH
  18. Remove the EN 46330 .

  19. Object Number: 1658274  Size: SH
  20. Tighten the camshaft sprocket bolt
  21. Tighten

    1. Tighten the bolt a first pass to 75 N·m (55 lb ft).
    2. Tighten the bolt a final pass an additional 50 degrees using J 45059 .

    Object Number: 1658136  Size: SH
  22. Remove the J 42386-A  (1) and bolts.
  23. Install the starter motor. Refer to Starter Motor Replacement.
  24. Install the oil pump. Refer to Oil Pump, Screen, and Crankshaft Oil Deflector Replacement.