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.
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.