Date: Thu, 28 Jul 2005 04:14:51 GMT
From: "James Sweet" <>
Subject: Re: 1982 900 crankshaft pulley source?

"Malt_Hound" <Malt_Houndnospamm*> wrote in message > James Sweet wrote: > >>The crank pulley, or harmonic balancer, consists of two pieces of steel > >>- an inner disk and an outer ring - with a rubber band sandwitched > >>between them. > >> > >>As the rubber ages, it is no longer capable of transmitting full torque > >>to the outer ring, so you get slippage between inner disk (driven by the > >>crankshaft) and outer ring (which drives the belts). > >> > >>The symptoms usually start with a squeal on startup, and on revving etc. > >>Similar to belt squeal. This gradually gets worse, until the pulley > >>eventially comes apart. > >> > >>A good way to keep an eye on it: using white marker, draw a couple of > >>lines on the outer surface of the pulley (the face you can see), running > >>from the center to the outer edge. These lines cross the rubber band. If > >>you ever get slippage, the lines will no longer line up. A quick glance > >>at the pulley at service time will tell you if there's been any slippage. > >> > >> > > > > > > > > Ah, that makes sense, didn't realize the belts were driven through the > > harmonic ballancer. > > > > > > > As versus what? AFAIK all belt drives come off the harmonic balancer... > > -Fred W I never paid much attention, haven't had one break but I just assumed the pully was driven off the center portion and the weighted part of the balancer wasn't connected to anything. I've only ever dealt with that part on Volvos though.

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