See Figures 1, 2, 3, 4 and 5
Fig. Fig. 1: There are typically 3 types of accessory drive belts found on vehicles today
Fig. Fig. 2: An example of a healthy drive belt
Fig. Fig. 3: Deep cracks in this belt will cause flex, building up heat that will eventually lead to belt failure
Fig. Fig. 4: The cover of this belt is worn, exposing the critical reinforcing cords to excessive wear
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.
TENSION CHECKING & ADJUSTINGFan Belt
See Figures 6, 7, 8, 9, 10, 11 and 12
Fig. Fig. 6: A gauge is recommended, but you can check belt tension with thumb pressure
Fig. Fig. 7: Various belt tension adjustments on the diesel engine
Fig. Fig. 8: Alternator belt tension adjustment
Fig. Fig. 9: Rotary engine belt tensioning points
Fig. Fig. 10: Some belts have adjuster pulleys that allow you to tighten and loosen tension simply by turning a screw ...
Fig. Fig. 11: ... while others require you to pry on them to tighten tension and push on them to loosen