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post #1 of 30 Old November 20th, 2012, 04:46 PM Thread Starter
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Squeaky belt

My belt was chirping really bad, so I went ahead and pulled the head unit off and replaced the belt. Initially it wasn't making any noise. Now it is starting to chirp just a little bit. I swapped the idler pulley for a little bit smaller one because my belt was extremely tight after adding a Roush tensioner.

My question, is it too tight or too loose when a brand new belt is squeaking? Also, could it be something going out, like a pulley on something seizing up that's causing the noise. It's intermittent. The car runs great even when it's making the noise.

Anything that can point me in the right direction, or any direction is appreciated.



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post #2 of 30 Old November 20th, 2012, 05:32 PM
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Is it squeaking only at idol? Does it speed up when you rev it?

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post #3 of 30 Old November 20th, 2012, 06:57 PM Thread Starter
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Seems like it stops when I put a load on the engine. Squeaks at idle then stops as I take off. It's starts to squeak more initially when I rev it to take off then goes away.


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post #4 of 30 Old November 20th, 2012, 08:04 PM
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Try spraying a tiny bit of WD40 on each pulley one at a time and see when it stops.. If it stops squeaking on a pulley, replace that pulley. Also ive heard that pulleys can kinda get glazed over like rotors do, and that alittle bit of light sanding can fix the squeak.

I might also try putting the breaker bar on the idler and relieving a little bit of pressure on the belt and see if it stops the chirp. If it does, it just means the new belt needs to stretch alittle bit i think.

Pulley alignment might also be off. If the above doesnt fix it, id rent a laser aligner and see if a pulley is off.

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post #5 of 30 Old November 20th, 2012, 08:10 PM Thread Starter
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Try spraying a tiny bit of WD40 on each pulley one at a time and see when it stops.. If it stops squeaking on a pulley, replace that pulley. Also ive heard that pulleys can kinda get glazed over like rotors do, and that alittle bit of light sanding can fix the squeak.

I might also try putting the breaker bar on the idler and relieving a little bit of pressure on the belt and see if it stops the chirp. If it does, it just means the new belt needs to stretch alittle bit i think.

Pulley alignment might also be off. If the above doesnt fix it, id rent a laser aligner and see if a pulley is off.
My fear is this is the problem.

I'm having trouble diagnosing it because when I got home, it had stopped. FML



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post #6 of 30 Old November 20th, 2012, 08:50 PM
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Hmm, well i cant help u with the fact it stops when u get home lol. Also, i think i heard that if you spray the belt with a light mist of water while its squeeking and it stops, then its the belt.. If it doesnt stop, its a pulley.

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post #7 of 30 Old November 20th, 2012, 08:57 PM Thread Starter
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I sprayed it with belt conditioner and it started then stopped.



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post #8 of 30 Old November 20th, 2012, 09:02 PM
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drive it to a long straight low traffic road, then beat the shit out of it! usually works on my truck lol. it could break or fix itself, either way it will be fun!




no i dont do this with my car.....


i think its probably just a new belt, is it a constant like squeal or a chirp chirp chirp?

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post #9 of 30 Old November 20th, 2012, 09:06 PM Thread Starter
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drive it to a long straight low traffic road, then beat the shit out of it! usually works on my truck lol. it could break or fix itself, either way it will be fun!




no i dont do this with my car.....


i think its probably just a new belt, is it a constant like squeal or a chirp chirp chirp?
Chirping.



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post #10 of 30 Old November 20th, 2012, 09:12 PM
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try a stethoscope on each of the pullies to at least find out where its coming from. once you locate it it will probably jump right out whats wrong.

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post #11 of 30 Old November 20th, 2012, 09:13 PM
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Belts most likely too loose. Don't use belt conditioner. Get a tighter belt.


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post #12 of 30 Old November 20th, 2012, 09:18 PM Thread Starter
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Belts most likely too loose. Don't use belt conditioner. Get a tighter belt.


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I'm gonna swap idler pulleys back to the larger one and see if that stops it.


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post #13 of 30 Old November 20th, 2012, 10:32 PM
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remove, clean and reinstall the idlers.. and put them in different positions. I had the same problem and I got billet idlers from Procharger and haven't had the problem since.



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post #14 of 30 Old November 20th, 2012, 10:44 PM Thread Starter
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remove, clean and reinstall the idlers.. and put them in different positions. I had the same problem and I got billet idlers from Procharger and haven't had the problem since.
To swap the idler pulleys I have to remove the supercharger. Ugh!



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post #15 of 30 Old November 20th, 2012, 10:50 PM
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Take a dab of silicone adhesive. Put it on the ribbed side of the belt. Start the car and let it idle for 4-5 minutes so it smears it all the way around. Little bird should be gone. It's a little old school, but it works, trust me.

Go try it right now and let me know what a genius I am.


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post #16 of 30 Old November 21st, 2012, 08:37 AM
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I'm gonna swap idler pulleys back to the larger one and see if that stops it.


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When I did my 8 groove PS pump pulley swap, My belt ticked at 1st, then started chirping, I thought it was the alignment of the PS pulley and the 8 rib idler but then I figured out the belt was rubbing on the rear of the water pump pulley.

I shimmed the 8 rib idler with a 5/8" grade 8 washer to move the belt forward on the water pump pulley and the chirp went away.
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post #17 of 30 Old November 21st, 2012, 08:43 AM Thread Starter
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Thanks, I'll check that out.



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post #18 of 30 Old November 21st, 2012, 08:49 AM
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I actually had this exact same problem with my stang a little while back. First time I replaced the belt, since it seemed like all the pulleys were good and of course, the noise went away. Eventually though, it came right back after all of about a month.

Couldn't figure it out at all until I slipped while I was underneath the hood on the alternator and I saw that it had some give to it. The pulley on the alternator itself was shot. So I went ahead and replaced the alternator altogether and now, no more squeak.
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post #19 of 30 Old November 21st, 2012, 02:15 PM
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As mentioned if you spray water on the ribs of the belt and it goes away then it is the belt not in-line with one of the pulleys. I'm fighting the same issue now, just can't figure out which is out of alignment a little.

The chirp is the belt catching part of the way in the pulley ribs and it chirps as it slides into place to the bottom of the pulley. It will go away as it warms because the belt becomes softer with heat.
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post #20 of 30 Old December 1st, 2012, 12:34 AM Thread Starter
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Quote:
Originally Posted by 07 Boss View Post
Take a dab of silicone adhesive. Put it on the ribbed side of the belt. Start the car and let it idle for 4-5 minutes so it smears it all the way around. Little bird should be gone. It's a little old school, but it works, trust me.

Go try it right now and let me know what a genius I am.
You are a fucking genius. Thanks for the tip.


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