GM Grand Am/Achieva/Calais/Skylark/Somerset 1985-98

Timing Belt and Tensioner

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Vehicles equipped with the 2.0L (VIN M) engine are the only vehicles covered by this information which utilize a timing belt. The timing belt should be inspected for cracks, wear or other damage and should be replaced every 60,000 miles (100,000 km).

REMOVAL & INSTALLATION



2.0L Engine
1987-88 MODELS

See Figures 1, 2 and 3

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing belt cover. For details, please refer to the procedure located in this section.
  4.  
  5. If not done already, raise and safely support the vehicle.
  6.  
  7. Remove the crankshaft pulley.
  8.  
  9. Carefully lower the vehicle until it is just above floor level.
  10.  
  11. Remove the coolant reservoir.
  12.  
  13. Loosen the water pump mounting bolts, then remove the timing belt.
  14.  



Click image to see an enlarged view

Fig. Fig. 1: View of the timing belt and related components-1987-88 2.0L engine

To install:
  1. Position the camshaft so the mark on its sprocket aligns with the mark on the rear timing belt cover.
  2.  
  3. Position the crankshaft so the mark on the pulley aligns with 10° BTDC on the timing scale.
  4.  

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. Install the timing belt.
  2.  
  3. Check the timing belt tension using tool J-26486-A or equivalent. Tool J-33039 or equivalent, is used to adjust the belt tension at the water pump. With the gauge installed, adjust the tension to within the band on the gauge. Adjusting the tension with the gauge installed on the belt will ensure an initial over-tensioning with the new belt.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Making the timing belt tension adjustment-1987-88 2.0L engine



Click image to see an enlarged view

Fig. Fig. 3: Common tool-J 26486-A dial reading

  1. Crank the engine, but DO NOT start it, about 10 revolutions; a substantial tension loss should occur as the belt takes a set position.
  2.  
  3. Recheck the tension with the gauge. If a tension increase is needed, remove the gauge and adjust the water pump. Repeat until the tension is within specification.
  4.  

Do not increase tension with the gauge installed or the resulting tension will be inaccurate.

  1. After the proper tension has been reached, tighten the water pump bolts to 19 ft. lbs. (25 Nm).
  2.  
  3. Install the timing belt cover and all related parts.
  4.  
  5. Raise and safely support the vehicle.
  6.  
  7. Install the crankshaft pulley, then install the serpentine belt. If equipped, install the A/C belt.
  8.  
  9. Carefully lower the vehicle.
  10.  
  11. Install the coolant reservoir.
  12.  
  13. Connect the negative battery cable and road test the vehicle.
  14.  

1989 MODELS

See Figure 4

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the serpentine belt.
  4.  
  5. Remove the timing belt cover as outlined earlier in this section.
  6.  
  7. Loosen the water pump mounting bolts and relieve the tension using tool J-33039 or equivalent.
  8.  
  9. Raise and safely support the front of the vehicle.
  10.  
  11. Remove the crankshaft pulley.
  12.  
  13. Carefully lower the vehicle.
  14.  
  15. Pull off the timing belt.
  16.  



Click image to see an enlarged view

Fig. Fig. 4: View of the timing belt and related components-1989 2.0L engine

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 portion of the belt between the camshaft and crankshaft gears has no slack.
  4.  
  5. Adjust the timing belt using tool J-33039 or equivalent, to turn the water pump eccentric clockwise until the tensioner contacts the high torque stop. Temporarily tighten the water pump screw slightly to prevent movement.
  6.  
  7. Turn the engine by the crankshaft gear bolt, 2 full revolutions (720°) clockwise 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. This must be done with the engine at room temperature.
  10.  
  11. Tighten the water pump screws/bolts to 19 ft. lbs. (25 Nm), making sure the tensioner hole remains aligned as in Step 13.
  12.  
  13. Install the crankshaft pulley.
  14.  
  15. Attach the timing belt cover and all related parts.
  16.  
  17. Connect the negative battery cable and road test the vehicle.
  18.  
  19. Check for any abnormal noises.
  20.  

 
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