Bad Harmonic Balancer? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-06-2004, 01:35 PM   #11
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Might note that 91 was a transition year between the earlier "C" 3800s which have a "slip fit" balancer and the "L" 3800 which is a press fit. It it needs to be replaced, make sure you get the right one.

Haven't experienced a balancer failure but have been told that it sounds like a rod bearing knock that goes away when you remove the serpentine belt and with the engine off, can feel movement in the rim.
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Old 05-14-2004, 11:03 PM   #12
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Just thought I'd give you guys an update....

Aftermarket balancer was installed.. cost me $270 for the part, and almost nothing for the labor.

Had the transmission completely rebuilt for $1250.
She'* running pretty good now, there'* a new rattle somewhere (I think exhaust)... but I haven't been able to track it down yet.

It'* very suttle... I can only hear in INSIDE the car... when the stereo is off.
It'* coming from the rear, but I can't hear it outside.

Anyways... just thought I'd let you all know how I made out.
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