GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 39946 Crankshaft Socket

Removal Procedure

  1. Remove the oil pump. Refer to Oil Pump Replacement .

  2. Object Number: 517185  Size: SH
  3. Align the primary timing marks (1) using the J 39946 .
  4. Remove the secondary camshaft drive chains. Refer to Secondary Camshaft Drive Chain Replacement - Right Side and Secondary Camshaft Drive Chain Replacement - Left Side .
  5. Remove the primary drive chain tensioner. Refer to Primary Camshaft Drive Chain Tensioner Replacement .

  6. Object Number: 928361  Size: SH
  7. Remove the oil outlet tube bolts (1-5).
  8. Remove the oil outlet tube.

  9. Object Number: 928363  Size: SH
  10. Remove and discard the oil outlet tube O-ring.
  11. Clean and inspect the oil outlet tube. Refer to Oil Pump Outlet Tube Cleaning and Inspection .

Installation Procedure


    Object Number: 928363  Size: SH
  1. Install a NEW O-ring on the oil outlet tube.
  2. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 928361  Size: SH
  3. Install the oil outlet tube and bolts (1-5) and tighten to 10 N·m (89 lb in) .

  4. Object Number: 517185  Size: SH
  5. Ensure the primary timing marks (1) are aligned vertically.
  6. Install the primary drive chain tensioner. Refer to Primary Camshaft Drive Chain Tensioner Replacement .
  7. Install the secondary camshaft drive chains. Refer to Secondary Camshaft Drive Chain Replacement - Left Side and Secondary Camshaft Drive Chain Replacement - Right Side .
  8. Install the oil pump. Refer to Oil Pump Replacement .