GM Metro/Sprint 1985-1993 Repair Guide

Belts

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INSPECTION



Check the drive belts every 30,000 miles (50,000 km) or 24 months for evidence of cracking, fraying or incorrect tension. Determine the belt tension at a point halfway between the pulleys by using a GM Belt Tension Gauge No. BT-33-95-ACBN or equivalent. If tension is found to be too much or too little, perform the tension adjustments.

ADJUSTMENT



See Figure 1



It is better to have belts too loose than too tight. Overly tight belts will lead to bearing failure, particularly in the water pump and alternator. However, loose belts place an extremely high impact load on the driven components due to the whipping action of the belt.
 
A GM Belt Tension Gauge No. BT-33-95-ACBN or equivalent is required for tensioning accessory drive belts.
 



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Fig. Fig. 1: Checking drive belt tension

  1. If the belt is cold, operate the engine (at idle speed) for 15 minutes; the belt will seat itself in the pulleys allowing the belt fibers to relax or stretch. If the belt is hot, allow it to cool, until it is warm to the touch.
  2.  
  3. Loosen the component-to-mounting bracket bolts.
  4.  
  5. Using a GM Belt Tension Gauge or equivalent, place the tension gauge at the center of the belt between the longest span.
  6.  
  7. Applying belt tension pressure on the component, adjust the drive belt tension to the correct specifications.
  8.  
  9. While holding the correct tension on the component, tighten the component-to-mounting bracket bolt.
  10.  
  11. When the belt tension is correct, remove the tension gauge.
  12.  

REMOVAL & INSTALLATION



Generator/Coolant Pump Belt
  1. Remove the air cleaner assembly.
  2.  
  3. Remove the air compressor suction pipe bracket, as required.
  4.  
  5. Raise and support the vehicle safely. Remove the right lower splash shield.
  6.  
  7. Remove the air compressor drive belt by releasing the tensioner pulley and removing the belt from the crankshaft and compressor pulleys.
  8.  
  9. Lower the generator cover plate, then lower the vehicle.
  10.  
  11. Loosen the adjusting bolt on the upper generator mounting bracket and remove the coolant pump/generator drive belt from the vehicle.
  12.  

To install:
  1. Install the the coolant pump/generator drive belt on the pulleys.
  2.  
  3. Raise and support the vehicle safely. Install the lower generator cover plate and tighten bolts to 89 inch lbs. (10 Nm).
  4.  
  5. Install the air compressor drive belt by releasing the tensioner pulley.
  6.  
  7. Install the right lower splash shield and lower the vehicle.
  8.  
  9. Adjust the drive belt tension to 0.25-0.35 in. and tighten the upper generator adjustment bolt to 17 ft. lbs. (23 Nm).
  10.  
  11. Install the air compressor suction pipe bracket, as required.
  12.  
  13. Install the air cleaner assembly.
  14.  

Air Conditioner Compressor Belt
  1. Remove the air cleaner assembly.
  2.  
  3. Remove the air compressor suction pipe bracket, as required.
  4.  
  5. Raise and support the vehicle safely. Remove the right lower splash shield.
  6.  
  7. Remove the air compressor drive belt by releasing the tensioner pulley and removing the belt from the crankshaft and compressor pulleys.
  8.  

To install:
  1. Install the air compressor drive belt by releasing the tensioner pulley.
  2.  
  3. Install the right lower splash shield and lower the vehicle.
  4.  
  5. Adjust the drive belt tension to 0.25-0.35 in. and tighten the upper generator adjustment bolt to 17 ft. lbs. (23 Nm).
  6.  
  7. Install the air compressor suction pipe bracket, as required.
  8.  
  9. Install the air cleaner assembly.
  10.  

 
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