GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • DW-110-060 Engine Assembly Support Fixture
    • EN-48245 Timing Belt Adjuster - Camshaft Holder
    • EN-48246 Timing Belt Adjuster - Crankshaft Holder

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1821742  Size: SH
  1. Disconnect the negative battery cable.
  2. Remove the engine cover. Refer to Engine Cover Replacement.
  3. Remove the charge air system hoses and ducts. Refer to Charge Air Cooler Inlet Pipe and Outlet Pipe Replacement.
  4. Remove the accessory belt. Refer to Drive Belt Replacement.

  5. Object Number: 1765828  Size: SH

    Important: Only lift the engine far enough to take the weight off the engine mount assembly, or damage to the mount and lifting equipment failure may occur.

  6. Support the engine assembly using DW-110-060 .

  7. Object Number: 1822547  Size: SH
  8. Remove the engine mount damping block. Refer to Engine Mount Replacement - Right Side.

  9. Object Number: 1822549  Size: SH
  10. Remove the timing belt upper cover.
  11. Remove the accessory belt idler.
  12. Remove the tensioner. Refer to Drive Belt Tensioner Replacement.
  13. Remove the crankshaft pulley.
  14. Remove the timing belt lower cover.
  15. Remove the engine mount bracket.

  16. Object Number: 1820584  Size: SH
  17. Remove the vacuum pump. Refer to Vacuum Pump Assembly Replacement

  18. Object Number: 1822550  Size: SH
  19. Rotate the camshaft and align the hole on the top point.
  20. Rotate the crankshaft and align the mark on the crankshaft sprocket.

  21. Object Number: 1822551  Size: SH
  22. Remove the crankshaft holder hole cap bolt (1).
  23. Insert EN-48246
  24. Important:  Rotate the crankshaft sprocket a little and simultaneously insert the crankshaft holder.

  25. Install the EN-48245

  26. Object Number: 1820436  Size: SH
  27. Remove the timing belt tensioner.
  28. Remove the timing belt.
  29. Remove the camshaft sprocket.

Installation Procedure


    Object Number: 1820518  Size: SH
  1. Align the sprocket mark on the timing belt rear cover mark.

  2. Object Number: 1820436  Size: SH
  3. Install the camshaft sprocket with the retaining bolt finger tight.
  4. Install the timing belt.
  5. Install the timing belt tensioner with the retaining bolt finger tight.

  6. Object Number: 1822553  Size: SH
  7. Turn the hex-key (1) tab in a counterclockwise direction to tension the belt. Turn until the point aligns with the notch (2).
  8. Aligning with notch, install the timing belt tensioner bolt.
  9. Notice: Refer to Fastener Notice in the Preface section.

  10. Install the camshaft sprocket bolt.
  11. Tighten

        • Tighten the timing belt tensioner bolt to 25 N·m (18.4 lb in).
        • Tighten the camshaft sprocket bolt to 133 N·m (98.1 lb in).
  12. Remove the crankshaft and camshaft holding tools.
  13. Turn the crankshaft in a clockwise direction 2 cycles and check the mark on the crankshaft sprocket.
  14. Important: If the timing marks are not aligned, repeat steps 4-10 and recheck the timing marks. Alignment of timing marks is critical for engine performance and emissions.

  15. After alignment of the timing belt, install the crankshaft holder hole cap bolt.
  16. Tighten
    Tighten the crankshaft holder hole cap bolt to 30 N·m (22.1 lb ft).

  17. Install the vacuum pump. Refer to Vacuum Pump Assembly Replacement

  18. Object Number: 1822549  Size: SH
  19. Install the engine mount bracket.
  20. Install the timing belt lower cover.
  21. Install the crankshaft pulley.
  22. Install the accessory belt idler.
  23. Notice: Refer to Fastener Notice in the Preface section.

  24. Install the timing belt upper cover.
  25. Tighten

        • Tighten the engine mount bracket bolts to 45 N·m (33.1 lb ft).
        • Tighten the timing belt lower cover bolts to 11 N·m (97.4 lb in).
        • Tighten the crankshaft pulley bolts to 34 N·m (25.1 lb ft).
        • Tighten the accessory belt idler bolt to 52 N·m (38.4 lb ft).
        • Tighten the timing belt upper cover bolts to 11 N·m (97.4 lb in).

    Object Number: 1822547  Size: SH
  26. Install the engine mount damping block. Refer to Engine Mount Replacement - Right Side.
  27. Remove the engine support fixture.
  28. Install the accessory belt. Refer to Drive Belt Replacement.
  29. Install the charge air system hoses and ducts. Refer to Charge Air Cooler Inlet Pipe and Outlet Pipe Replacement.
  30. Install the engine cover. Refer to Engine Cover Replacement.
  31. Connect the negative battery cable.