GM Service Manual Online
For 1990-2009 cars only

    Object Number: 2016721  Size: SH

    Note: Be sure to cover the oil hole completely because air leaks due to insufficient sealing will prevent the lock pin from being released.

  1. After cleaning and degreasing the camshaft actuator oil hole on the intake side of the camshaft bearing cap, completely seal the oil hole with adhesive tape (3) or equivalent as shown in the illustration to prevent air from leaking.
  2. Prick a hole (2) in the tape covering the oil hole as shown in the illustration.

  3. Object Number: 2016722  Size: SH

    Note: 

       • The camshaft timing gear assembly may be turned in the advance direction without applying any force.
       • If enough air pressure cannot be applied because of air leakage from the port, releasing the lock pin may be difficult.
       • If air leaks out, reattach the adhesive tape.
       • Cover the oil hole with a shop rag or piece of cloth when applying air pressure to prevent oil from spraying.
       • Do not lock the camshaft timing gear assembly. If it is locked, release the lock pin again.

  4. Apply approximately 150 kPa (22 psi) of air pressure to the hole pricked in the above step to release the lock pin.
  5. Remove the adhesive tape from the camshaft bearing cap.

  6. Object Number: 2016730  Size: SH

    Note: 

       • Before removing the camshaft timing gear, make sure that the lock pin has been released.
       • Be sure not to remove the other 4 bolts (2).
       • Keep the camshaft timing gear assembly horizontal while removing it from the camshaft.

  7. Remove the flange bolt (1) while holding the hexagonal portion of the intake camshaft, and then remove the camshaft timing gear assembly.

  8. Object Number: 2017062  Size: SH

    Note: 

       • Be sure not to remove the other 4 bolts (2).
       •  Keep the camshaft timing exhaust gear assembly horizontal while removing it from the camshaft.

  9. Remove the flange bolt (1) while holding the hexagonal portion of the exhaust camshaft, and then remove the camshaft timing gear assembly.