Need help identifying cause of high RPM squeal - Team Camaro Tech
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post #1 of 6 (permalink) Old Apr 10th, 10, 12:40 PM Thread Starter
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Erik
 
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Need help identifying cause of high RPM squeal

When winding through the gears above 4500 RPM's, I have a squealing noise that I am trying to eliminate. At the end of last year, my power steering pump started leaking and I assumed that it was the cause. However, I have replaced the pump and I still have the squeal.

My belts seem to be tight and my alternator and water pump were both replaced two years ago. At that time, there was no noise. I noticed the squeal for the first time last year.

I don't get the noise when it's not under load ( revving in the driveway). It only seems to happen as I wind through first and second gear when I get to 4500 - 5000 RPM's. Since it only happens when I am driving, I am wondering if it could be something else other than a belt or a bearing on the alternator, water pump or power steering pump. I may take the belt off of the power steering to see if that eliminates it. My alternator belt runs the water pump so that is harder to test. I have also tried spaying some WD-40 on the alternator pulley, but that didn't help.

Any ideas?

69 Camaro - 327 "461X" heads, Comp Cams 280H, Quick Fuel 650cfm with LT1 intake, MSD 6AL, M23Z transmission, 10-bolt 3.73:1 Posi
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post #2 of 6 (permalink) Old Apr 10th, 10, 01:41 PM
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Fred
 
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Re: Need help identifying cause of high RPM squeal

Yep. New belts. And dry off the WD 40. It's not a belt dressing, but a lubricant.

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post #3 of 6 (permalink) Old Apr 10th, 10, 02:06 PM Thread Starter
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Erik
 
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Re: Need help identifying cause of high RPM squeal

I forgot to mention that I replace the belts two years ago also ( with the new alternator and water pump. You think that I should replace them?

Also, I sprayed the WD-40 on the inside of the alternator pulley to lubricate the pulley. I was careful not to get any on the belt.

69 Camaro - 327 "461X" heads, Comp Cams 280H, Quick Fuel 650cfm with LT1 intake, MSD 6AL, M23Z transmission, 10-bolt 3.73:1 Posi
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post #4 of 6 (permalink) Old Apr 10th, 10, 03:10 PM
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Scott
 
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Re: Need help identifying cause of high RPM squeal

I know it's obvious but are the pulleys running true and aligned? If and once the belts glaze they are toast.
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post #5 of 6 (permalink) Old Apr 10th, 10, 04:04 PM
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Re: Need help identifying cause of high RPM squeal

ok here is the fix
the pulley groove are most likely worn smooth and any torque will slip the belt
you can remove belt and use some rough sandpaper in the grooves to provide some grip for the nelt.
or beadblast the pulleys.


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post #6 of 6 (permalink) Old Apr 10th, 10, 09:23 PM
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Re: Need help identifying cause of high RPM squeal

Try some belt grip..comes in a stick and aerosol...apply to each belt one at a time to find which one
Do you have 2 belts on the power steering pump?
when you buy theses check the batch number on the belts and make sure they are the same batch....if from 2 different batches there can be a very slight difference in the 2 and one will not tension as well as the other...

And yeah been down that route..it was a retired service mechanic that told me about the above...fixed the issue.

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