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Alternator belt

 
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Old 28 Feb 2020, 06:41 pm
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Join Date: Feb 2016
Location: Clearwater FL
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Default Alternator belt

Belt was squeaking

Put new autozone belt on it. Good for a few days

Then started squeaking. Tightened the thing up real well. Good for a few days and then squeaking again.

Iíll try again to tighten it. How tight should it be? Maybe the autozone belt sucks
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Old 29 Feb 2020, 08:28 am
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Default Re: Alternator belt

Take the belt off and try cleaning the pulleys.
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Old 29 Feb 2020, 11:32 am
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Join Date: Jun 2014
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Default Re: Alternator belt

On the alternator belt I seem to remember the rough guide to setting the tension is to twist the belt. You should be able to twist the belt by hand (between pulleys) about 90 degrees. Again, I'm working from memory, but it should get the tension in the right ballpark. You don't want to over-tighten the belt as it could damage the alternator bearings.

I would NOT recommend belt dressing. I've used it in the past with bad results. Just do as chuzz says and make sure everything is clean.

Last edited by RickinPA; 29 Feb 2020 at 11:34 am.
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Old 29 Feb 2020, 06:22 pm
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Default Re: Alternator belt

Just a quick follow-up. I dug a little and found this:
How to Check Belts on a CarNAPA Know How Blog

So, I'd adjust what I said and say 90 degrees is a maximum. Most guides use belt deflection, but I've found that method difficult, if not nearly impossible, where the serpentine belt is in close quarters. But you can always get in there and twist the belt to judge the tension.
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Old 01 Mar 2020, 08:51 am
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Location: Clearwater FL
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Default Re: Alternator belt

Thanks

I tightened it up. No more noise for now

It was looser than I had set it. I think the belt just stretched
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Old 01 Mar 2020, 04:51 pm
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Join Date: Oct 2015
Location: Abbotsford, British Columbia.
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Default Re: Alternator belt

Hi, there is a special procedure in the factory manual for tightening the generator belt to a specific frequency. It was designed to be used with the chrysler DRBIII tool.

BUT You can install a guitar-tuning app to your phone, set the speaker really close and then strum the belt at least 3 times with a screw driver to make the frequency show up in the app.

New belt 235-247 Hz
Used belt 207-217 Hz

Tighten pivot bolt to 40 ft-lb and the locking nut to 40 ft-lb.
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