GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • EN-48245 Camshaft Locking Tool
    • EN-48946 Crankshaft Locking Tool

For equivalent regional tools, refer to Special Tools .


    Object Number: 2027461  Size: SH
  1. Remove the wiring harness plug (2).
  2. Remove 4 wiring harness clips (1) from the bracket (3).

  3. Object Number: 2027459  Size: SH
  4. Remove the 2 nuts (2) from the wiring harness bracket (1).
  5. Remove the wiring harness bracket (1).

  6. Object Number: 2027460  Size: SH
  7. Remove the 4 vacuum pump bolts (2).
  8. Remove the vacuum pump (1).
  9. Remove the vacuum pump gasket (3).

  10. Object Number: 2027173  Size: SH
  11. Rotate the crankshaft to the markings at the crankshaft sprocket and oil pump cover.

  12. Object Number: 2027172  Size: SH

    Note: 

       • Examine that the bore (1) in the camshaft (2) is on top.
       • Examine the correct positions of the camshaft and the crankshaft.

  13. Rotate the camshaft (1) to the shown position.

  14. Object Number: 2027175  Size: SH
  15. Install the EN-48946 locking tool  (1) to fix the camshaft and install the bolts (2) and tighten to  12 N·m (107 lb in) .
  16. Remove the lower crankcase closure bolt (5).
  17. Install EN-48245 locking tool  (4) into the lower crankcase hole (3). Turn the crankshaft to TDC until the tool engages in the crankshaft.

  18. Object Number: 2027176  Size: SH
  19. Loosen the timing belt tensioner bolt (2).
  20. Turn the timing belt tensioner with an hex-key (1) clockwise until the timing belt is solved.

  21. Object Number: 2027494  Size: SH
  22. Remove the timing belt (1).