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

Belts

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INSPECTION



See Figures 1 through 5

Inspect the belts for signs of glazing or cracking. A glazed belt will be perfectly smooth from slippage, while a good belt will have a slight texture of fabric visible. Cracks will usually start at the inner edge of the belt and run outward. All worn or damaged drive belts should be replaced immediately. It is best to replace all drive belts at one time, as a preventive maintenance measure, during this service operation.



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Fig. Fig. 1: There are typically 3 types of accessory drive belts found on vehicles today



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Fig. Fig. 2: An example of a healthy drive belt



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Fig. Fig. 3: Deep cracks in this belt will cause flex, building up heat that will eventually lead to belt failure



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Fig. Fig. 4: The cover of this belt is worn, exposing the critical reinforcing cords to excessive wear



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Fig. Fig. 5: Installing too wide a belt can result in serious belt wear and/or breakage

ADJUSTING



V-Belt

See Figure 6

  1. Loosen the alternator mounting bolts. The upper adjusting bolts is usually 15mm.
  2.  
  3. Using a standard belt tension gauge, install it to the center of the longest span of the drive belt.
  4.  
  5. Use a medium prybar on the adjustment lug of the accessory (alternator, compressor or power steering pump) to adjust the belt tension to specification. Tighten the mounting and adjusting bolts.
  6.  



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Fig. Fig. 6: Belt tension gauge for an engine with V-belts

  1. Adjust the V-belts as follows:
  2.  

Alternator:


Used belt-90-100 lbs. (400-450 Nm)
 
New belt-165-175 lbs. (750-788 Nm)
 

Power steering/coolant pumps:


Used belt-90-100 lbs. (400-450 Nm)
 
New belt-180 lbs. (800 Nm)
 

Air conditioning compressor:


Used belt-90-100 lbs. (400-450 Nm)
 
New belt-165 lbs. (750 Nm)
 

Serpentine Belt

See Figure 7

A single serpentine belt may be used to drive engine-mounted accessories. Drive belt tension is maintained by a spring loaded tensioner. The drive belt tensioner can control belt tension over a broad range of belt lengths, however, there are limits to the tensioner's ability to compensate.

A belt squeak when the engine in started or stopped is normal and does not necessarily indicate a worn belt. If the squeak persists or worsens, inspect the belt for wear and replace as necessary.

  1. Inspect the tensioner markings to see if the belt is within operating lengths. Replace the belt if the belt is excessively worn or is outside of the tensioner's operating range.
  2.  
  3. Run the engine until operating temperature is reached. Be sure all accessories are off. Turn the engine off and read the belt tension using a belt tension gauge tool placed halfway between the alternator and the air conditioner. If not equipped with air conditioning, read the tension between the power steering pump and crankshaft pulley. Remove the tool.
  4.  
  5. Run the engine for 15 seconds, then turn it off. Using a box-end wrench, apply clockwise force to tighten to the tensioner pulley bolt. Release the force and immediately take a tension reading without disturbing belt tensioner position.
  6.  
  7. Using the same wrench, apply a counterclockwise force to the tensioner pulley bolt and raise the pulley to its fully raised position. Slowly lower the pulley to engage the belt. Take a tension reading without disturbing the belt tensioner position.
  8.  



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Fig. Fig. 7: Serpentine drive belt markings

  1. Average the 3 readings. If their average is lower than the following specifications, replace the tensioner:

    2.0L and 2.3L engines: 50 lbs. (220 Nm)
     
    3.0L engine: 79 lbs. (351 Nm)
     
    3.3L engine: 67 lbs. (298 Nm)
     
    1994-96-3.1L engine: 50-70 lbs. (225-315 Nm)
     
    1997-98-30-50 lbs. (133-222 Nm)
     

  2.  

REMOVAL & INSTALLATIONV-Belt



See Figure 8

  1. Disconnect the negative battery cable.
  2.  
  3. Loosen the accessory-to-mounting bracket bolt(s) and adjusting bolt.
  4.  
  5. Rotate the accessory to relieve the belt tension.
  6.  
  7. Slip the drive belt from the accessory pulley and remove it from the engine.
  8.  

If the engine uses more than one belt, it may be necessary to remove belts that are in front of the belt being removed.



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Fig. Fig. 8: If the engine uses more than one belt, it may be necessary to remove belts that are in front of the belt being removed

To install:
  1. Place the new belt over the crankshaft or drive pulley and stretch over the driven (accessory) pulley.
  2.  
  3. If removed, install the other belts in the same way.
  4.  
  5. Adjust the belts to the proper tension.
  6.  
  7. Tighten the adjusting and mounting bolts.
  8.  

Serpentine Belt
EXCEPT 3.1L ENGINE

See Figure 9

  1. Disconnect the negative battery cable.
  2.  
  3. Insert a 1 /2inch (13mm) drive breaker bar into the adjuster arm on the tensioner pulley. Later models require an 18mm box end wrench.
  4.  

Make sure the drive end of the breaker bar is long enough to fully seat in the tensioner pulley and that both the breaker bar and box wrench are long enough to provide the proper leverage.

  1. Rotate the tensioner to the left (counterclockwise) and remove the belt.
  2.  
  3. Slowly rotate the tensioner to the right (clockwise) to release the tension.
  4.  



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Fig. Fig. 9: Serpentine belt removal-3.3L engine

To install:
  1. Route the belt over the pulleys following the diagram found in the engine compartment.
  2.  
  3. Rotate the tensioner to the left (counterclockwise) and install the belt over the remaining pulley.
  4.  
  5. Inspect the belt positioning over each pulley to ensure the belt is seated properly in all the grooves.
  6.  

3.1L ENGINE

See Figures 10 and 11

  1. Disconnect the negative battery cable.
  2.  
  3. Using a drive belt tension wrench, rotate the tensioner.
  4.  



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Fig. Fig. 10: Rotate the belt tension clockwise

  1. Remove the drive belt from the alternator pulley.
  2.  
  3. Support the engine at the oil pan. Follow the information on supporting the engine using a block of wood and jacking devise, this is very important.
  4.  



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Fig. Fig. 11: Only raise and support the engine in the following manner

  1. Remove the engine mount assembly from the bracket support.
  2.  
  3. Unbolt and remove the auxiliary bracket.
  4.  
  5. Lower the engine and extract the drive belt.
  6.  

To install:
  1. Rotate the belt tensioner.
  2.  
  3. Place the drive belt around the pulleys and attach the auxiliary bracket. Tighten the bracket fasteners to 37 ft. lbs. (50 Nm).
  4.  
  5. Install the engine mount to the support bracket bolts. Tighten the bolts to 96 ft. lbs. (130 Nm).
  6.  
  7. Remove the floor jack and block of wood.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Start the engine and check fore any out of the ordinary noises.
  12.  

 
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