Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Belts

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INSPECTION





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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

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.

ADJUSTMENT





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Fig. Fig. 6 Belt deflection can be checked by using thumb pressure



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Fig. Fig. 7 To set the correct belt tension, loosen the adjusting bolt, pry the alternator, then tighten the bolt

Any engine V-belt is correctly tensioned when the longest span of belt between pulleys can be depressed about 1 / 2 in. in the middle by moderate thumb pressure. To adjust, loosen the accessory's slotted adjusting bracket bolt. If the hinge bolt is very tight, it may be necessary to loosen it to move the item.


WARNING
Be careful not to overtighten belts, as this will damage the bearings, particularly in air or water pumps and alternators.

 
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