Balancer Size - Team Camaro Tech
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post #1 of 7 (permalink) Old Apr 14th, 11, 05:39 AM Thread Starter
jamesv
 
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Balancer Size

I have a 79 350 5.7 V8 small block stock camaro. I've had it for a few years now. I only drive it in summer, as it needs work. I noticed the harmonic balancer wobbling. Going to replace it, I find it's an 8" diameter internal balancer. I am told the correct replacement balancer for my engine is a 6.75" balancer. Is this right? Do I have the right size balancer on my car? Is is okay to have an 8" harmonic balancer on there? I just want to make sure I buy & replace with the right part. Thanks.
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post #2 of 7 (permalink) Old Apr 14th, 11, 05:48 AM
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Re: Balancer Size

The 6 3/4" dampener is the correct part. It's not going to hurt anything to change it either way.

One piece of advice while you're changing it... after you've removed the bolt\dampener from the crank, blow out the bolt hole in the end of the crank real good with carb cleaner or brake parts cleaner. It'll be full of debris and grit. Don't ask me how... but it gets cruddy in there.

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post #3 of 7 (permalink) Old Apr 14th, 11, 06:04 AM Thread Starter
jamesv
 
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Re: Balancer Size

If I replace it with a 6.75" balancer, will I need to replace the a/c and alternator belts with different sizes?
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post #4 of 7 (permalink) Old Apr 14th, 11, 06:10 AM
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John
 
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Re: Balancer Size

No the belts run on a pulley, that bolts to the balancer, not the balancer it's self.
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post #5 of 7 (permalink) Old Apr 14th, 11, 06:14 AM Thread Starter
jamesv
 
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Re: Balancer Size

That's the crankshaft pulley, right? Could that part be why my balancer is wobbling? A few guys told me I should replace the crankshaft pulley, because that could be the cause. Is that right? Do you think I should replace that part too? I appreciate any help you can give me. I'm new at this stuff.

Last edited by jamesv; Apr 14th, 11 at 06:31 AM.
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post #6 of 7 (permalink) Old Apr 14th, 11, 07:05 AM
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Re: Balancer Size

I seriously doubt a pulley could cause a dampener to wobble. It's bolted to the center hub.
But it's very likely the pulley is wobbling on it's own.

Or the dampener center bolt is loose and it's ready to come off the crank snout. The outer ring of the dampener could be sliding one way or the other off of it's hub, which is common. I just changed one that the outer ring was crooked. It won't make the pulley wobble though.

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post #7 of 7 (permalink) Old Apr 14th, 11, 07:32 AM Thread Starter
jamesv
 
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Re: Balancer Size

Thanks for your help!
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