Tips on tracking down pulley/belt squeak please?

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Oct 26, 2021 | 04:35 PM

waddisme

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Safety Car

Joined: May 2007

Posts: 4,812

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From: Taylorsville North Carolina

Tips on tracking down pulley/belt squeak please?

Any way to tell which pulley is squeaking? Run motor briefly without belt and no squeak. Would that eliminate crank pulley? Switched out tensioner and have new AC compressor. Car is tracked so it does run some at 7K rpms, but is also daily driven. Suggestions?

Oct 26, 2021 | 06:54 PM

C5 Diag

Moderator, Tech Contributor

Joined: Sep 2013

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From: Cape Coral, Florida

Hope this helps !!…can also be a misalignment issue !!

Last edited by C5 Diag; Oct 26, 2021 at 06:55 PM.

Oct 27, 2021 | 11:43 AM

waddisme

Thread Starter

Safety Car

Joined: May 2007

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From: Taylorsville North Carolina

Great vid. Will follow those steps tonite.

Oct 27, 2021 | 11:58 AM

G_Loc

Burning Brakes

Joined: Jul 2010

Posts: 820

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From: Miami, Fl

How long did you run the engine for without the belts? Was it a constant squeak or did it vary with engine speed? Could also be the exhaust hanger springs. Greasing them up takes care of the issue.

Oct 28, 2021 | 01:14 PM

newmember2121

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Joined: Oct 2021

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theres a ton of pulleys on these cars (two idler, two tensioner, p/s, harmonic, ac, alternator, water pump, etc.) I would disconnect the ac belt and narrow it down from there. chances are its your harmonic balancer though if that has never been replaced.

Oct 28, 2021 | 04:08 PM

Autoeng

Burning Brakes

Joined: Mar 2020

Posts: 776

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From: KY

If you have an oil catch can that can cause what it perceived to be a belt squeak. See mycorvettelife on youtube for his journey trying to find a squeak that wasn't a squeak...

Oct 28, 2021 | 05:03 PM

grinder11

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Quote:

Originally Posted by waddisme

If you've spilled any antifreeze on the belts, they will eventually squeal. I have over 120,000 miles on my pulleys/tensioner, all original, except the ASP balancer. Mine squealed terrible after spilling Dex Cool on them changing the t-stat. Squealing was so bad, I was ashamed to drive it. I thought about buying new pulleys, or a new tensioner. But when I removed an idler wheel, I measured the very slight wear in the middle caused by the belt running over it a million times, and wear was only .015"!! The bearing(s) felt fine, and smooth. So I bought only new belts, and the squeal disappeared. Just sayin'......

Last edited by grinder11; Oct 28, 2021 at 05:21 PM.

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