Toyota Cressida/Corona/Crown/MarkII 1970-1982 Repair Guide

Belts

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INSPECTION





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Fig. Fig. 1 Inspect the tension at the longest span of the belt. Some components can be tensioned by an adjustment nut, others need to be pried



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Fig. Fig. 2 To inspect the belt off the engine, bend it and check for cracks, deterioration, stretching and wear



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



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Fig. Fig. 4 An example of a healthy drive belt



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Fig. Fig. 5 Deep cracks in this belt will cause flex, building up heat that will eventually lead to belt failure



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Fig. Fig. 6 The cover of this belt is worn, exposing the critical reinforcing cords to excessive wear



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Fig. Fig. 7 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.

At engine tune-up (every 12,000 miles), check the condition of the drive belts and check and adjust belt tension as below:

  1. Inspect 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. Replace the belt at the first sign of cracking or if glazing is severe.
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  3. Belt tension does not refer to play or droop. By placing your thumb midway between two pulleys, it should be possible to depress each belt about 3 / 8 to 1 / 2 inch with 22-24 lbs. of pressure. If the belt can be depressed more than this, or cannot be depressed this much, adjust the tension. Inadequate tension will result in slippage and wear, while excessive tension will damage bearings and cause belts to fray and crack.
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To adjust the tension; loosen the pivot and mounting bolts or idler pulley of the component which the belt is driving. Use a soft wooden hammer handle, a broomstick, or the like to pry the component toward or away from the engine until the proper tension is achieved.


WARNING
Do not use a screwdriver or other metal device, such as a prybar, as a lever.

Tighten the component mounting bolts securely. If a new belt has been installed, recheck the tension after about 200 miles of driving.

 
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