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Installation and Initial Adjustment Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying J 42069-1 & J 42069-2
    GM345381Courtesy of GENERAL MOTORS CORP.
    NOTE: When installing a new or used timing belt, the directional arrows on the timing belt must be matched with the rotation of the crankshaft. If this precaution is not observed, excessive wear and timing belt failure may occur.
    IMPORTANT: Guide marks are printed on the timing belt to aid in installation. If these marks are not identifiable, install a new belt.
    Arrows are printed on the timing belt indicating the required direction of travel. When installing the timing belt, ensure the arrows are traveling in engine rotational direction, clockwise.
    Do not crimp or bind the timing belt when handling or installing.
  1. Install the J 42069-1 and J 42069-2 to hold camshafts.
    2. Fig 2: Identifying Guide Marks
    GM826215Courtesy of GENERAL MOTORS CORP.
  2. Slip the timing belt though the 3 and 4 camshaft simultaneously, ensuring the dash marks on the timing belt align with the marks on the camshaft gears and the notches on the rear timing belt cover.
  3. Route the timing belt through the upper idler pulley.
  4. Slip the timing belt though the 1 and 2 camshaft gears simultaneously, ensuring the dash marks on the timing belt align with the marks on the camshaft gears and the notches on the rear timing belt cover.
  5. Route the timing belt through the timing belt tensioner.
    6. Fig 3: Turning Crankshaft Back To TDC
    GM826214Courtesy of GENERAL MOTORS CORP.
  6. Ensure the crankshaft is at TDC.
  7. Install the timing belt on the crankshaft drive gear with the double dash mark on the belt aligned with the marks on the oil pump and on the belt drive gear.
    8. Fig 4: Rotating Crankshaft Counter Clockwise To 3 Degrees BTDC, Allowing Timing Belt To Slide On The J 42069-30
    GM826218Courtesy of GENERAL MOTORS CORP.
  8. Using the J 42098  rotate the crankshaft to 3° before TDC making sure the timing belt does not jump teeth. See Special Tools and Equipment .
    9. Fig 5: Identifying Timing Belt Components
    GM826217Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  9. Install the lower idler pulley with the timing belt on it.
  10. Install the lower idler pulley bolt.

    Tighten:  Tighten the lower idler pulley bolt to 40 N.m (30 lb ft).

    11. Fig 6: Turning Crankshaft Back To TDC
    GM826214Courtesy of GENERAL MOTORS CORP.
  11. Turn the crankshaft back to TDC, using the J 42098  . See Special Tools and Equipment .
    12. Fig 7: Identifying J 42069-20
    GM345823Courtesy of GENERAL MOTORS CORP.
  12. Apply tension to the timing belt, at the upper idler pulley by turning the high point of the eccentric to approximately the 9 o'clock position. Tighten the idler pulley locking bolt, while holding the eccentric with the J 42069-40, until snug.
    13. Fig 8: Identifying Tensioner Eccentric Reference Mark
    GM833453Courtesy of GENERAL MOTORS CORP.
  13. Rotate the tensioner eccentric counter clockwise to full stop, turn the eccentric back until the reference mark is (a) 1 mm (0.039 in) over the flange.
  14. Tighten the timing belt tensioner until snug, the locking nut will be tightened to specifications after all final adjustments are made.
    15. Fig 9: Identifying Guide Marks
    GM826215Courtesy of GENERAL MOTORS CORP.
  15. Inspect the alignment marks on the timing belt to ensure that they are aligned with the appropriate reference points on the camshaft gears, the rear timing belt cover and on the oil pump housing.
    16. Fig 10: Rotating Crankshaft Using J 42098
    GM345367Courtesy of GENERAL MOTORS CORP.
  16. Rotate the crankshaft, with the J 42098  , in the clockwise direction 2 revolutions stopping at 60 degrees BTDC. See Special Tools and Equipment .
    17. Fig 11: Identifying J 42069-1 & J 42069-2
    GM345381Courtesy of GENERAL MOTORS CORP.
  17. Remove the J 42069-1 and J 42069-2.
    18. Fig 12: Identifying J 42069-10
    GM345377Courtesy of GENERAL MOTORS CORP.
  18. Install the J 42069-10 to the crankshaft drive gear.
  19. Turn the crankshaft until the lever of the J 42069-10 firmly contacts the water pump flange.
  20. Secure the moveable lever of the tool to the water pump pulley flange.
    21. Fig 13: Identifying Alignment Reference Marks
    GM159005Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The alignment marks on the timing belt will no longer align with the marks on the camshaft gears after one or more engine revolutions.
  21. Inspect the alignment of the reference marks on the camshaft gears with the notches on the rear timing belt cover.
    22. Fig 14: Turning Crankshaft Back To TDC
    GM826214Courtesy of GENERAL MOTORS CORP.
  22. Inspect the alignment of the reference mark on the crankshaft drive gear and oil pump housing.
    23. Fig 15: Identifying J 42069-20
    GM826220Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The reference marks on both sets of the camshaft gears must match exactly with the marks on the J 42069-20 checking gage.
  23. Use the J 42069-20 to inspect the alignment of the camshaft gears 3 and 4.
  24. Use the J 42069-20 to inspect the alignment of the camshaft gears 1 and 2.
    25. Fig 16: Setting Final Timing Belt Tension
    GM826216Courtesy of GENERAL MOTORS CORP.
  25. If timing belt adjustment IS REQUIRED, refer to Timing Belt Timing Procedure.
  26. If timing belt adjustment IS NOT REQUIRED, set the final timing belt tension:
    1. Loosen the timing belt eccentric locking nut.
    2. Turn the eccentric counter clockwise to full stop, then back until the reference mark is (a) 3-4 mm (0.118-0.158 in) above the mark on the flange.

      Tighten:  Tighten the timing belt tensioner eccentric locking nut to 20 N.m (15 lb ft).

    27. Fig 17: Identifying J 42069-20
    GM345823Courtesy of GENERAL MOTORS CORP.
  27. Hold the upper idler pulley eccentrics in place with the J 42069-40.

    Tighten:  Tighten the upper idler pulley bolt to 40 N.m (30 lb ft).

    28. Fig 18: Identifying J 42069-10
    GM345377Courtesy of GENERAL MOTORS CORP.
  28. Remove the J 42069-10 from the engine.
    29. Fig 19: Rotating Crankshaft Using J 42098
    GM345367Courtesy of GENERAL MOTORS CORP.
  29. For final inspection rotate the engine in the clockwise direction two revolutions until reaching 60 degrees BTDC.
    30. Fig 20: Identifying J 42069-10
    GM345377Courtesy of GENERAL MOTORS CORP.
  30. Install the J 42069-10 to the crankshaft drive gear.
    31. Fig 21: Identifying J 42069-10
    GM345377Courtesy of GENERAL MOTORS CORP.
  31. Turn the crankshaft until the lever of the J 42069-10 firmly contacts the water pump flange.
  32. Secure the moveable lever of the tool to the water pump pulley flange.
    33. Fig 22: Identifying Alignment Reference Marks
    GM159005Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The alignment marks on the timing belt will no longer align with the marks on the camshaft gears after one or more engine revolutions.
  33. Inspect the alignment of the reference marks on the camshaft gears with the notches on the rear timing belt cover.
    34. Fig 23: Inspecting Alignment Of Reference Marks On Crankshaft Drive Gear & Oil Pump Housing
    GM831318Courtesy of GENERAL MOTORS CORP.
  34. Inspect the alignment of the reference mark on the crankshaft drive gear and oil pump housing.
    35. Fig 24: Identifying J 42069-20
    GM826220Courtesy of GENERAL MOTORS CORP.
  35. Use the J 42069-20 to inspect the alignment of the camshaft gears 3 and 4.
  36. Use the J 42069-20 to inspect the alignment of the camshaft gears 1 and 2.
  37. If the reference marks on the camshaft gears do not match exactly, timing belt adjustment IS REQUIRED.

    Refer to the Timing Belt Timing Procedure.

  38. If the reference marks match exactly, further timing belt adjustment IS NOT necessary.

    Continue with reassembly of the engine.

  39. Ensure all of the tools are removed from the engine.
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