Noize similar to belt or pully problem

JAGUAR XJ6
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PDOBY39237
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I have a 1996 Jaguar XJ6, 4.0L6Cyl, milage 112600.
I had belts checked and replaced by dealer. On cold start there is a squeeling belt type noise that goes away after about 1 minute. When engine is warm no noise is heard when starting. Dealer service told me it is the dynamic balancer that is going bad. Is this true and if it is when should it be replaced?
Oct 21, 2007 at 3:39 PM
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MERLIN2021
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Harmonic balance maybe? Usually the go bad if they get soaked with oil for a while...it sounds more like the tensioner is NG.
Oct 21, 2007 at 3:44 PM