Alternator belt screaming

[bsendkew]

My alternator belt keeps screaming. i tighten the bracket but then after like 3miles of driving it loosens and gets very tight. then it gets very hot and starts screaming. it is a brand new alternator, could i be missing a bracket or something?

 

[92AWDHX40]

MMM did you try to adjust it, sounds either too loose or tight?

 

[agentorange313]

Squeaking belts occur when there is moisture or some kinda of dampness/residue on the belt itself, or on the pulley that it mates with.

Oil and coolant is very common to cause this, it has the potential to leak from various places on the engine and can get on the belts.

Is your bracket loosening? or is the belt that loosening? If its the belt, just get a new one, take two min to put on, especially since you changed the alternator you have the ability to change the belt. If its your bracket that keeps loosening I would look into the thread and bolt that are holding it in place.

When the belt is situated in position, and prepared to be tightened, there should be 1/4inch of play in the belt, if you depress it in the middle.

 

[jpmxrider489]

I have the same problem but mine goes away after warm up. Its a common thing to have a loud belt with our dsms. I know a few people that have this issue.

 

[ricktb]

First time i thought i over tightened my belts, turns out they were still loose and make a screech sound. Tightened them up and sound went away. There are problems also if you do end up over-tightening. Can cause premature wear on pulley bearings and belt. There is a specification in your haynes manual. Something like 8mm deflection if measured from a line across the top edge of both pulleys. Also the pulleys have to be in line perfectly. I had to make adjustments on my steering pump to align the pulleys

 

[gofer]

It could be the alternator itself too. I tightened an alternator belt so tight because it was pissing me off from the noise it would make that it snapped while I was driving, turned out the remaned alternator was the culprit. After I replaced it the sound disappeared.

 

[TrevorS]

I have the same problem but mine goes away after warm up. Its a common thing to have a loud belt with our dsms. I know a few people that have this issue.

If the belt squeals, it's not tight enough. Just keep tightening in small increments until it stops. My experience with my '90 is you have to be careful about how the bolt is oriented. One can easily end up tightening against nothing, and so pay close attention to exactly how it's positioned when tightening.

 

[Bud92gsx]

Mine squeels only on startup.Nothing when warm...I need to tighten the belt is all..

 

[gusu]

You could also have bad alternator bearings but I would assume its the belt not being properly tightened first.

 

[gieri002]

Make sure to disconnect your battery before tightening the belt! Let us know how it goes.

 

[TrevorS]

Make sure to disconnect your battery before tightening the belt!

I see absolutely no reason for this and definitely wouldn't do that myself. Please explain!

 

[RamenPride]

Sometimes the belt can screech if the crank pulley is going bad.

 

[bsendkew]

ok so its not the the bracket is loosening the belt just gets tight...what do u think?

 

[hhuricane]

Some brands of belts just like to squeal. I can't put Gates on mine or it howls, Dayco works fine though. If it has been doing it for awhile the belt could be glazed and you'll never get it to stop. Try a new belt tensioned properly.

 

[m1nd64m3]

I had the same problem and could not get it to go away, tried everything. Ended up being the alternator.

 

[bsendkew]

like i said its a brand new alt. also it is a fully rebuild so everything engine wise i brand new or 100% restored. the belt i am using is a gates blue.

 

[gofer]

like i said its a brand new alt.

It doesn't matter, if the belts tight and it still squeals its the alternator. I went through three reman'd alternators before I found one that didn't howl at me every morning and piss off the neighbors.

Heres the FSM page, torque everything to spec (the tensioner bolt in particular) and if the symptoms don't change then its the alternator.

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[josh408]

Did you get the alternator from kragens or auto zone?

 

[Vladimir]

The nost common reason why belts squeel are: loose belt, contaminated belt (oil, coolant, water), pulley problems such as bad or binding bearing, tensioner problems, improper belt routing...etc.

If the belt is new and its not contaminated , check all the bearings, could be the altenator it self binding.

Dont tightet the belt too much cause you put to much load on the bearings. Let it be tight, but not as tight as your body can make it.

 

[TexasTurbo]

I have the same problem but mine goes away after warm up. Its a common thing to have a loud belt with our dsms. I know a few people that have this issue.

Hey man, if your belt is squeaking then there is an issue. It's not a "this is just how DSM's are" kind of thing. DSM's are like any other vehicle in that the components that make it up are largely similar and serviced in the same manner as other vehicles are. A squeaky belt is a squeaky belt and there are known fixes for this issue. I wouldn't just "deal with it" as something that "these cars do."

 

[jcarmichael]

It doesn't matter, if the belts tight and it still squeals its the alternator. I went through three reman'd alternators before I found one that didn't howl at me every morning and piss off the neighbors.

Heres the FSM page, torque everything to spec (the tensioner bolt in particular) and if the symptoms don't change then its the alternator.

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simple question simple well stated answer

 

[turboglenn]

I had this issue once and it turned out the crank pulley was seperated, no matterwhat it would squeel, then i inspectecdand saw the split inthe rubber on the damper pulley

chekc that too