GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN-48036 Oil Pump Alignment Tool
    • J 45059 Angle Meter

For equivalent regional tools, refer to Special Tools


    Object Number: 1674306  Size: SH

    Note: Ensure the proper friction washer is installed in the correct position.

  1. Select the crankshaft sprocket to oil pump drive friction washer (2). The outer diameter is 55.0 mm (2.1654 in) and an inner diameter, including tabs, of 35.0 mm (1.3780 in).

  2. Object Number: 1674296  Size: SH
  3. Install the crankshaft sprocket to oil pump drive friction washer.

  4. Object Number: 1674298  Size: SH
  5. Install the oil pump.

  6. Object Number: 1674299  Size: SH

    Caution: The EN 48036 must be used during the installation of the oil pump. Failure to use the EN 48036 to align the oil pump to the crankshaft can lead to oil pump damage and severe engine damage.

  7. Install the EN-48036 tool over the crankshaft nose and up to the oil pump.

  8. Object Number: 1674300  Size: SH
  9. Loosely install the oil pump bolts.

  10. Object Number: 1660812  Size: SH
  11. Apply force by hand to the EN-48036 tool against the oil pump in order to align the oil pump to the oil pump drive.
  12. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1674307  Size: SH
  13. While keeping hand force on the EN-48036 tool tighten the oil pump bolts in sequence (1, 2, 3) as shown.
  14. 7.1. First pass to 10 N·m (89 lb in).
    7.2. Final pass to an additional 35 degrees using the J 45059 meter .

    Object Number: 1674305  Size: SH
  15. Remove the EN-48036 tool .