GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • J 39946 Crankshaft Socket
    • EN 46327 Timing Chain Retention Tool
    • EN 46328 Camshaft Holding Tool

Removal Procedure


    Object Number: 1247903  Size: SH
  1. Remove the right actuator housing. DO NOT remove the camshaft position (CMP) actuator solenoids from the housing. Refer to Camshaft Position Actuator Housing Replacement - Right Side.
  2. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement.
  3. Note: The secondary timing chain has black links that are used for alignment when the primary and secondary timing gear and chain assemblies are being installed together. IT IS NOT NECESSARY for the black chain links to be aligned with the camshaft actuator timing marks when the secondary chain and gear components are being serviced separately.

  4. Using the J 39946 , rotate the crankshaft until both bank 1 (right) CMP actuator timing marks are perpendicular (90 degrees) to the cylinder head deck surface and near the top of their rotation.
  5. Warning: Refer to Camshaft Holding Tool Warning in the Preface section.


    Object Number: 1275659  Size: SH
  6. Install the EN 46328  (1) to the camshafts (2).

  7. Object Number: 1275692  Size: SH
  8. Use a paint stick to create a mark (1) on the timing chain link adjacent to each camshaft position actuator timing mark (2, 3).

  9. Object Number: 1275725  Size: SH
  10. Install the EN 46327  (1) using the installation of the EN 46327 timing chain retention tool procedure.

Installation of the EN 46327 Timing Chain Retention Tool - Right Bank


    Object Number: 1275721  Size: SH
  1. Rotate the wing nut (3) of the EN 46327 to the top of its travel.

  2. Object Number: 1275702  Size: SH
  3. Position the bottom retention tool on the cylinder head with the V-notch of the block (1) adjacent to the right exhaust camshaft actuator timing sprocket and chain as shown.

  4. Object Number: 1275713  Size: SH
  5. Insert the hook end (2) into a secondary timing chain link as shown.

  6. Object Number: 1275702  Size: SH
  7. Rotate the wing nut until it contacts the retention tool block (1). DO NOT tighten the wing nut at this time.

  8. Object Number: 1275721  Size: SH
  9. Rotate the wing nut of the EN 46327  (4) to the top of its travel.

  10. Object Number: 1275703  Size: SH
  11. Position the top retention tool on the cylinder head with the V-notch of the block (1) adjacent to the right intake camshaft actuator timing sprocket and chain as shown.

  12. Object Number: 1275718  Size: SH
  13. Insert the hook end (2) into a secondary timing chain link as shown.

  14. Object Number: 1275703  Size: SH
  15. Rotate the wing nut until it contacts the retention tool block (1). Alternately tighten both wing nuts to retain the chain.
  16. Caution: Refer to Torque Reaction Against Timing Drive Chain Caution in the Preface section.


    Object Number: 1275678  Size: SH
  17. Use an open end wrench on the hex cast into the right exhaust camshaft to prevent the camshaft from rotating when loosening the camshaft oil control valve.

  18. Object Number: 1276769  Size: SH
  19. Loosen and remove the right exhaust oil control valve (1).

Installation Procedure


    Object Number: 1261666  Size: SH
  1. Install the oil control valve through the opening in the right exhaust camshaft position actuator and thread it into the right exhaust camshaft.

  2. Object Number: 1275693  Size: SH
  3. Ensure both camshaft actuator timing marks (1, 3) are aligned with the paint marks on the secondary timing chain previously created.
  4. Caution: Refer to Torque Reaction Against Timing Drive Chain Caution in the Preface section.

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1275678  Size: SH
  5. Use an open end wrench on the hex cast into the right exhaust camshaft to prevent the camshaft from rotating when tightening the camshaft oil control valve to 120 N·m (89 lb ft).

  6. Object Number: 1275659  Size: SH
  7. Remove the EN 46327  (1).

  8. Object Number: 1275667  Size: SH
  9. Remove the EN 46328  (1) from the camshafts (2).
  10. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement.

  11. Object Number: 1247903  Size: SH
  12. Install the right camshaft actuator housing. Refer to Camshaft Position Actuator Housing Replacement - Right Side.