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Reply to "Chirp sound from alt. belt area"

Not a lot of experience here, but the aftermarket pulleys are not as strong as the original VW and Porsche versions and they tend to flex a lot with the force exerted by the fan belt.  If the pulley shaft hole is not tight enough to the shaft, it allows the center hole to wear to the point where the halves wobble - always wider at the top and narrower at the bottom and as it wobbles, it wears the center hole more and more.  That movement is probably what you’re hearing.  Doubtful that you can duplicate the sound by hand with the belt off.

Last edited by Gordon Nichols
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