Thread: Squeaky Belt
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Old 11-01-2017, 09:39 AM   #3
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Join Date: May 2015
Location: Greater Seattle, WA
Posts: 534
Hi John, I've recently dealt with a wobbling crankshaft serpentine belt pulley in my 2001 2.7, and was surprised to find very little elsewhere documented about this problem:

I replaced the old (bent) pulley with the newer (straight) one, and while this managed to correct the serpentine belt vibration and runout, inspecting the pulleys more closely on a surface plate revealed troubling observations they they might have not been very well balanced when originally manufactured. The newer replacement pulley I stumbled across put on had thicker dimensions, so it gives me some hope of lasting longer.

Nice job onserving your serpentine belt also has runout. I suspect this "bent crank pulley" problem may be a whole lot more common than most people here realize!
2001 Boxster
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