Re: Belt tension?

Posted by Bob M on March 24, 2005 at 11:17:03 from (151.190.254.106):

In Reply to: Belt tension? posted by Andrew Z on March 24, 2005 at 10:30:59:

Andrew – If the belt’s slipping even when it’s tight it’s probably glazed or greasy. It should be replaced.

When you get the old belt off use paint thinner or spray brake cleaner and thoroughly clean both sheave grooves to remove any trace of grease, antifreeze, etc which will make even a new belt slip.

It doesn’t take much tension to for a good belt to grip – even if it’s pulling an alternator. About 1” to 1-1/2” of deflection with finger pressure applied midway between the sheaves is right. (Or if you can grab and turn the fan blade a bit by hand and the crankshaft follows, the belt's plenty tight.)

Don’t overtighten the belt! It only causes rapid wear on the fan hub bearings, and is hard on the belt too.

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