GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

Timing Belt

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REMOVAL & INSTALLATION



1.8L and 2.0L OHC Engine
1983-88 VEHICLES

See Figures 1 through 10

The following procedure requires the use of a special adjustment tool J33039 and tension gauge J26486-A or their equivalents.

  1. Remove the timing belt front cover, as outlined earlier in this section.
  2.  



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Fig. Fig. 1: Remove the upper part of the timing belt cover by unsnapping it - 1988 2.0L (VIN K) Sunbird shown

  1. Raise and support the vehicle safely.
  2.  
  3. Remove the crankshaft pulley as follows:
    1. Remove the inner fender splash shield,
    2.  
    3. Unfasten the retaining bolts, the remove the crankshaft pulley.

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      Fig. Fig. 2: Unfasten the retaining bolts, then ...



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      Fig. Fig. 3: ... remove the crankshaft pulley

    4.  

  4.  
  5. Carefully lower the vehicle until it is just above the floor.
  6.  
  7. If equipped, remove the coolant reservoir.
  8.  
  9. If necessary at this time, remove the lower portion of the timing belt cover.
  10.  



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Fig. Fig. 4: View of the lower part of the timing belt cover



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Fig. Fig. 5: Unsnap the cover to remove it

  1. Loosen the water pump retaining bolts and rotate the water pump to loosen the timing belt.
  2.  
  3. Remove the timing belt.
  4.  



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Fig. Fig. 6: Exploded view of the timing belt and related components - 1983-88 1.8L and 2.0L OHC engines

To install:
  1. Position the timing belt over the sprockets.
  2.  
  3. Install the crankshaft pulley.
  4.  
  5. Check that the mark on the camshaft sprocket lines up with mark on the camshaft carrier, on the 1.8L engine and the mark on the camshaft sprocket must line up with the mark on the rear timing belt cover on the 2.0L engine.The timing mark on the crankshaft pulley should line up at 10° BTDC on the indicator scale.
  6.  



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Fig. Fig. 7: The mark on the camshaft sprocket must line up with the mark on the rear timing belt cover - 1988 2.0L (VIN K) Sunbird shown


WARNING
Do not turn the camshaft. Use only the crankshaft nut to turn. Turning the nut on the camshaft directly can damage the camshaft bearings.

  1. Rotate the water pump clockwise using Tool J-33039 until all slack is removed from the belt. Slightly tighten the water pump retaining bolts.
  2.  



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Fig. Fig. 8: You must modify tool J-33039 to tighten the timing belt



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Fig. Fig. 9: Adjusting the timing belt tension - 1983-88 1.8L and 2.0L OHC engines

  1. Install Tool J-26486 between the water pump and camshaft sprockets so that the pointer is midway between the sprockets.
  2.  



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Fig. Fig. 10: Timing belt adjustment tool J-26486-A, used on the 1983-88 1.8L and 2.0L OHC engines

  1. If the tension is incorrect, loosen the water pump and rotate it using Tool J-33039 until the proper tension is obtained.
  2.  
  3. Fully tighten the water pump retaining bolts to 18 ft. lbs. (24 Nm), taking care not to further rotate the water pump.
  4.  
  5. Install the timing probe holder. Tighten the nuts to 19 ft. lbs. (26 Nm).
  6.  
  7. If removed, install the coolant recovery reservoir.
  8.  
  9. Install the timing belt front cover, snap into place ot tighten the attaching bolts to 5 ft. lbs. (7 Nm), depending upon application.
  10.  
  11. Install and adjust the alternator and power steering belt. Refill the cooling system, if necessary.
  12.  

1989-92 VEHICLES

See Figure 11

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the serpentine belt and timing belt cover.
  4.  
  5. Loosen the water pump bolts and release tension with tool J-33039 or equivalent.
  6.  
  7. Raise and support the vehicle safely.
  8.  
  9. Remove the crankshaft pulley.
  10.  
  11. Carefully lower the vehicle, then remove the timing belt.
  12.  



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Fig. Fig. 11: Exploded view of the timing belt assembly - 1989-92 OHC engines

To install:
  1. Turn the crankshaft and the camshaft gears clockwise to align the timing marks on the gears with the timing marks on the rear cover.
  2.  
  3. Install the timing belt, making sure the portion between the camshaft gear and crankcase gear is in tension.
  4.  
  5. Using tool J-33039 or equivalent, turn the water pump eccentric clockwise until the tensioner contacts the high torque stop. Tighten the water pump screws slightly.
  6.  
  7. Turn the engine by the crankshaft gear bolt 720° to fully seat the belt into the gear teeth.
  8.  
  9. Turn the water pump eccentric counterclockwise until the hole in the tensioner arm is aligned with the hole in the base.
  10.  
  11. Tighten the water pump screws to 18 ft. lbs. (24 Nm), while checking that the tensioner holes remain as adjusted in the prior step.
  12.  
  13. Install the crankshaft pulley, timing belt cover and the serpentine drive belt.
  14.  

1993-94 VEHICLES

See Figure 12

  1. Disconnect the negative battery cable, then partially drain and recover the cooling system.
  2.  
  3. Remove the coolant recovery reservoir.
  4.  
  5. If equipped, remove the A/C belt.
  6.  
  7. Remove the serpentine belt.
  8.  
  9. Disconnect the evaporative emission pipe assembly.
  10.  
  11. Remove the crankshaft pulley assembly.
  12.  
  13. As outlined earlier, remove the timing belt front cover.
  14.  
  15. Align the marks on the crankshaft sprocket with the marks on the rear timing belt cover by rotating the crankshaft.
  16.  
  17. Loosen the water pump retaining bolts, and release the tension with tool J 33039-A or equivalent.
  18.  
  19. Carefully lower the vehicle, then remove the timing belt.
  20.  



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Fig. Fig. 12: Timing belt installation and tightening specifications - 1993-94 2.0L OHC engines

To install:
  1. Turn the crankshaft and camshaft gears clockwise to align the timing marks on the gears with the timing marks on the rear cover.
  2.  
  3. Install the timing belt, making sure that the portion between the camshaft gear and crankshaft gear is in tension.
  4.  
  5. Using tool J 33039-A, or equivalent adjustment tool, turn the coolant pump eccentric clockwise until the tensioner arm contacts the high torque stop. Tighten the water pump screws slightly.
  6.  
  7. Turn the engine by the crankshaft gear bolt 720° clockwise to fully seat the belt into the gear teeth.
  8.  
  9. Turn the coolant pump eccentric counter clockwise until the hole in the tensioner arm is aligned with the hole in the base. This must be done with the engine at room temperature, approximately 68°F (20°C).
  10.  
  11. Tighten the water pump screws while checking that the tensioner holes remain as adjusted as in step 15.
  12.  
  13. As outlined earlier, install the timing belt cover.
  14.  
  15. Install the crankshaft pulley.
  16.  
  17. Connect the evaporative emission pipe assembly.
  18.  
  19. Install the serpentine drive belt and the A/C belt (if equipped).
  20.  
  21. Install the coolant recovery reservoir.
  22.  
  23. Properly fill the cooling system, then connect the negative battery cable.
  24.  

INSPECTION



See Figures 13 through 20



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Fig. Fig. 13: Check for premature parting of the belt



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Fig. Fig. 14: Check if the teeth are cracked or damaged



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Fig. Fig. 15: Look for noticeable cracks or wear on the belt face



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Fig. Fig. 16: You may only have damage on one side of the belt; if so, the guide could be the culprit



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Fig. Fig. 17: Foreign materials can get in between the teeth and cause damage



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Fig. Fig. 18: Inspect the timing belt for cracks, fraying, glazing or damage of any kind



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Fig. Fig. 19: Damage on only one side of the timing belt may indicate a faulty guide



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Fig. Fig. 20: ALWAYS replace the timing belt at the interval specified by the manufacturer

 
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