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Does that model have a harmonic balancer-type (archive)
[ Follow Ups ] [ 3-series (E21) Message Board ] [ Msg. Board FAQ ]
Posted by JIm Baron on June 20, 2000 at 15:57:38:

In Reply to: Help! @ 3500 rpm - terrible noise. posted by Andrew Juric on June 20, 2000 at 11:10:41:

crankshaft pulley??? I think it does. If so, you need to mark the outer edge of the pulleys and the inner part, even on the nut, and see if the outer ring of pulleys is slipping relative to the inner core because of a deteriorated rubber bond between them. It happens every few years on SAAB 900s because the pulley is located in such a hot spot just in front of the firewall and very close to the headers.

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