Harmonic Balancer - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-14-2004, 04:14 PM   #1
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Ok, it might be going on Grandma'* Revenge. Can you give me some info. on em. The symptoms if it is going.

Any info on it is great!
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Old 08-14-2004, 06:09 PM   #2
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Turn the engine off and see if you can rotate the pulleys by hand a few inches.
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Old 08-14-2004, 06:18 PM   #3
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It should be tight, remove the drive belt if you have to and check for any end play.

Not really the kind of thing that fails, what troubles are you having?
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Old 08-15-2004, 02:12 AM   #4
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Quote:
Originally Posted by PontiacDad
It should be tight, remove the drive belt if you have to and check for any end play.

Not really the kind of thing that fails, what troubles are you having?
I think my supercharger is going again
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Old 08-15-2004, 03:26 AM   #5
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I wondered about the noise it was producing, and your complaint about low boost. How'* the warranty on it?
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Old 08-15-2004, 12:59 PM   #6
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I got a 2 year warranty on it from the seller on ebay. I have contacted him and i belive he will honor it.

Here is what he said in his email to me:

Hi John, Sorry to hear about the problem. Are you certain it is the nose? Another frequent problem with these cars is the harmonic balancer. Also I dont want to scare you but even if there was a faulty bearing in the rebuild that has started to make noise or the harmonic balancer was going bad you would not experience performance loss. Even when they start making alot of noise they will still create normal boost unless the nose totally fails. Keep us posted, Randy
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Old 08-16-2004, 12:07 PM   #7
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When the harmonic balancer on my '92 failed, it failed when I started the engine. It didn't happen slowly over time. The engine made a loud rattling noise, but only at idle. The noise was very noticeable when starting or shutting off the engine.

There'* an easy way to isolate the cause of the noise.

You can use an automotive stethoscope to listen to the supercharger and the balancer pulley while the engine is running. Be careful. Or you can remove the supercharger belt and start and run the engine (only for a few seconds, then shut it off) to see if the noise is still there. If the noise is gone, then you know the problem is the supercharger or another part that'* driven by that belt. Turn each pulley by hand to test each part. If the noise is still there, then remove the main belt also, and then start and run the engine (only for a few seconds, then shut it off). If the noise is gone, then you know the problem is a part that'* driven by that belt, and again, turn each pulley by hand to test each part. If the noise is still there, then it'* the harmonic balancer or a problem in the engine.
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Old 08-16-2004, 12:33 PM   #8
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Great advice. Just keep in mind that you may not have only one problem. It could be a little of both. Especially with the miles on Grandma'* revenge. We should have looked at our balancers on the old cars while we had them up on Jerry'* lift at WCBF Tech Day.
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