GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • J 8433 Two Jaw Puller
    • J 41558 Crankshaft Sprocket Remover
    • J 41816-2 Crankshaft End Protector
    • J 42386-A Flywheel Holding Tool

For equivalent regional tools, refer to Special Tools


    Object Number: 1658140  Size: SH

    Note: 

       • Do not use the camshaft position (CMP) actuator solenoid valve again. Upon installation of the CMP actuator and timing chain, install a NEW valve.
       • Do not apply threadlock to the flex plate bolts at this time.

  1. Temporarily install the automatic transmission flex plate and bolts. Refer to Automatic Transmission Flex Plate Installation.
  2. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1658136  Size: SH
  3. Install the J 42386-A tool  (1) and bolts. Use 1 M10 - 1.5 x 120 mm and 1 M10 - 1.5 x 45 mm bolt for proper tool operation. Tighten the J 42386-A tool bolts to 50 N·m (37 lb ft).

  4. Object Number: 1670622  Size: SH
  5. Remove the CMP actuator solenoid valve (234).
  6. Discard the solenoid valve.
  7. Warning: Refer to Camshaft Position Actuator Removal and Installation Warning in the Preface section.


    Object Number: 1714936  Size: MH
  8. Loosen and separate the CMP actuator and timing chain from the camshaft. Position fingers behind the actuator sprocket and pull the actuator away from the front of the camshaft. Never pull on the reluctor wheel when attempting to remove the actuator.

  9. Object Number: 1658255  Size: SH
  10. Remove the CMP actuator (235) and timing chain (208).

  11. Object Number: 1714946  Size: SH
  12. Insert a tie strap (1) through the center of the actuator and over the reluctor wheel.

  13. Object Number: 1658178  Size: SH
  14. Remove the bolts (231) and timing chain tensioner (232).

  15. Object Number: 1658180  Size: SH
  16. Use the J 41816-2 protector  (1), the J 41558 remover  (2), bolts (3), and the J 8433 puller  (4) in order to remove the crankshaft sprocket.

  17. Object Number: 1658182  Size: SH
  18. Remove the crankshaft sprocket (207).

  19. Object Number: 156149  Size: SH
  20. Remove the crankshaft sprocket key, as required.
  21. Remove the flex plate and bolts. Refer to Automatic Transmission Flex Plate Removal.
  22. Remove the J 42386-A tool and bolts.