GM Lumina/Silhouette/Transport APVs 1990-1999 Repair Guide

Belts

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INSPECTION



The belts, which drive the engine accessories such as the alternator, the air pump, power steering pump, air conditioning compressor and water pump, are of serpentine belt design. Older style belts show wear and damage readily, since their basic design was a belt with a rubber casing. As the casing wore, cracks and fibers were readily apparent. Newer design, caseless belts do not show wear as readily, and many untrained people cannot distinguish between a good, serviceable belt and one that is worn to the point of failure. It is a good idea, therefore, to visually inspect the belt regularly and replace it, routinely, every two to three years.

ADJUSTING



A single belt is used to drive all of the engine accessories formerly driven by multiple drive belts. The single belt is referred to a serpentine belt. All the belt driven accessories are rigidly mounted with belt tension maintained by a spring-loaded tensioner. Because of the belt tensioner, no adjustment is necessary.

Removal & Installation



See Figures 1 through 6

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Fig. Fig. 1: An underhood decal can usually be found indicating belt routing



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Fig. Fig. 2: Typical serpentine belt configuration on a 3.4L engine



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Fig. Fig. 3: Typical 3.1L engine serpentine belt configuration



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Fig. Fig. 4: Typical 3.8L serpentine drive belt configuration



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Fig. Fig. 5: Use a wrench to disengage the tensioner. The longer the wrench the better leverage you will have



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Fig. Fig. 6: The belt is easily removed after the tension is released.

  1. Many applications will have a belt shield for protection. This will have to be removed first to access the serpentine belt.
  2.  
  3. To remove the drive belt on a 3.1 L, or a 3.4L engine, use a 3 / 8 in. ratchet or breaker bar to unload the tensioner and remove the belt. On the 3.8L engine use an 18mm wrench is used to unload the tension.
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WARNING
Take care as not to bend the tensioner when applying torque. Damage to the tensioner may occur. Maximum torque to load belt should not exceed 30 ft. lbs.

  1. Installation is the reverse of removal. Be sure to install the belt using the proper routing.
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