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We tighten fan and water pump belts enough so that it take a strong push to get 3/4 to 1 inch of movement in the middle of the belt between pulleys. This is for the wide belts. The narrow belts in the later cars should be a bit tighter. That is why they went to ball bearings in the pumps instead of the bushings. The really important fact about V belts is to get the correct belt for the job. Belts that are too narrow will bottom on the pulleys, and belts that are too wide will not get full contact on the sides, where the real work is done. We have been using the "cogged" belts, as they conform to pulleys somewhat better than the solid belts. Too tight belts will damage the fan hub and/or the generator bearings, if that is your fan mount. Usually, if you can slip the belt by turning the fan blades, it isn't tight enough.
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