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Old 12-02-2018, 05:30 PM
RPO RPO is offline
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Alternator Chewing Up Belt

After initially thinking that a squealing from under the hood was being caused by the electric fans going out, I'm now thinking that it may in fact be caused by the alternator belt getting torn up somehow.

I'm guessing it might be caused by an unaligned pulley? Anybody else had this issue before?
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Old 12-02-2018, 06:30 PM
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Could be a worn bearing somewhere. If it's bad enough it can cause an off kilter pulley or enough drag to cause slipping. Not to mention a squeal. I would eyeball the alignment and then take off the belt. Check everything that gets spun by the belt. If turning it by hand feels gritty, wobbly, super loose, hard to turn then it probably needs replacing.

Alternator, water pump, and idler/tensioners (if equipped) are usually the most troublesome but everything has its day.
I seem to recall the air pump being a common failure too. Mine was seized when I got it.
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Old 12-02-2018, 06:34 PM
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Another thing to think about... When the fans or any big electrical load pulls from the alternator it could be enough to cause slippage. Check tension.

A friend had a dodge shadow that would squeal when you turn the lights on. Drove it like that for months. He finally asked me to look at it. I tightened the belt via the alternator and problem was solved.
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Old 12-02-2018, 07:36 PM
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Belt is throwing a TON of rubber dust onto stuff as well



Alternator and belt are both brand new.

Last edited by RPO : 12-02-2018 at 07:54 PM.
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Old 12-03-2018, 02:10 AM
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FSJunkie FSJunkie is offline
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Holy smokes. No, that doesn't look misaligned.

I think the belt is slipping on the alternator pully. The alternator is too hard for the belt to turn it and the question is why. Lots of possible reasons:

1. Belt is too narrow for the pully and is bottoming out in the pully.
2. Belt is too loose.
3. Alternator is binding mechanically.
4. Alternator armature is shorted and causing resistance to rotor rotation.
5. Alternator is overloaded electrically or wired improperly.
6. One belt is not enough to turn an alternator producing that much amperage. Double v-belts or serpentine are needed.
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Old 12-03-2018, 11:21 AM
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Tightened the belt up and the squealing went away, we'll see how long that lasts and if it keeps throwing rubber.

Took some pics of the pulley system to see if it's properly set up...hoping someone in the know can verify.



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Old 12-14-2018, 12:04 AM
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The alternator is aligned with washers and spacers (moving it forward and aft) Is the alternator cocked hence the belt is running at an angle. Looks like a new alternator was installed.
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Old 12-14-2018, 12:24 AM
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Turns out I'm missing a handful of brackets that would secure the alternator enough to provide the stability necessary to avoid any inflection while in use.

Currently waiting on an ebay purchase to arrive in the mail with the intent of rectifying the above mentioned situation
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Old 12-17-2018, 01:57 PM
61Hawk 61Hawk is offline
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That's where you ground your battery?
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Old 12-17-2018, 02:01 PM
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That is not how the alternator is supposed to mount on these engines. That is some redneck crap right there.
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  #11  
Old 12-17-2018, 06:35 PM
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Battery ground has been moved already. Alternator brackets just arrived yesterday, hoping to get them installed this weekend.

Definitely some "creative" mods by the PO on this thing
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