Intermittent Belt Squeal - Team Camaro Tech
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post #1 of 8 (permalink) Old Jan 11th, 10, 02:54 PM Thread Starter
 
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Intermittent Belt Squeal

This is on my stock 71 350. Every once in a while I get an annoying and embarrsing belt squeal when I accelerate. I've checked the belt and it's tight.

What is strange is that I noticed the when the belt squeal happens, my dash lights are much brighter than normal. Almost as if there is some type of extra voltage coming out from the alternator which causes the dash lights to be bright and that the only time when the squeal occurs. Otherwise, no squeal at all when I drive. Aside from once having A/C (all gone now), I don't know what else can be causing this exta load on the alternator.

Any thoughts. Appreciate the help.
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post #2 of 8 (permalink) Old Jan 11th, 10, 03:13 PM
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Re: Intermittent Belt Squeal

Fan, extra load would dim your lights, not brighten. Sounds like a voltage regulator defect.

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post #3 of 8 (permalink) Old Jan 11th, 10, 05:06 PM
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Re: Intermittent Belt Squeal

As Fred suggests, faulty voltage regulator. Its telling the alternator to output more than it should.
Replace it with an electronic regulator, Wells/Duralast P/N VR715 - plug & play.

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post #4 of 8 (permalink) Old Mar 8th, 10, 12:46 PM Thread Starter
 
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Re: Intermittent Belt Squeal

Quote:
Originally Posted by Everett#2390 View Post
As Fred suggests, faulty voltage regulator. Its telling the alternator to output more than it should.
Replace it with an electronic regulator, Wells/Duralast P/N VR715 - plug & play.
Just wanted to close the book on one and make a post for future reference for anyone that may have the same issues.

I purchsed the Wells/Duralast regulator metioned above and my wacky voltage issue is gone. No problems since I brought this up in the orignal post.

The regulator looks slightly different than the orignal Delco that was on my car. But it fit perfect and problems are gone!

Thanks again!
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post #5 of 8 (permalink) Old Mar 8th, 10, 12:57 PM
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Re: Intermittent Belt Squeal

I used to have that issue and the only fix was to bead blast the pulleys where the belt makes contact.
(if the groove is shiney and smooth itll squeel a bit)


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post #6 of 8 (permalink) Old Mar 8th, 10, 11:43 PM
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Re: Intermittent Belt Squeal

what brand belt are you using? i use dayco top cog belts and haven't had any issues with belt squeal. The dayco's come in two different widths, for example 15350 and 17350. The 15 and 17 represent the width, where the 17 is slightly wider than the 15 and 350 represents the length, 35.0 inches. A slightly wider belt than your using now may help with the noise issue.

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post #7 of 8 (permalink) Old Mar 9th, 10, 01:20 PM
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Re: Intermittent Belt Squeal

When it's squealing it's slipping.
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post #8 of 8 (permalink) Old Mar 9th, 10, 05:44 PM
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Re: Intermittent Belt Squeal

True, the belt is slipping, but it's due to the mech reg putting the alt to full load and belt squeals.

Now since the new reg is on, demand is monitored better and so is the load on alt, less slippage.

However, still a good idea to check/tighten belt tension or change it if one cannot remember the last time it was replaced.

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