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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, Nov-13-2018, 11:01:51 PM   #1
Texaz3
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Default Squeaky belt/pulley/tensioner - help diagnose

I have developed a squeak which is coming from a tensioner or a pulley, so without buying a bunch of parts how do I go about figuring out which one is it? Or do I just replace all?
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Old Tue, Nov-13-2018, 11:17:41 PM   #2
NolliM3
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

I would place my money on the idler pulley...encircled in green. A better-diagnosis would be to use a mechanic stethoscope.
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Old Wed, Nov-14-2018, 12:17:00 AM   #3
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

Replacing all tensioners and belts is less than 200 dollars with all parts considered.

I highly suggest that you replace everything while you're in there.
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Old Wed, Nov-14-2018, 12:57:02 AM   #4
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

I agree with Omair. I gave up picking away at these common failures and just do everything when due.

My answer is to do it all new.
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Old Wed, Nov-14-2018, 12:57:33 AM   #5
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Default Squeaky belt/pulley/tensioner - help diagnose

Quote:
Originally Posted by NolliM3 View Post
I would place my money on the idler pulley...encircled in green. A better-diagnosis would be to use a mechanic stethoscope.


Idler pulley is actually #14, it can be identified in the image by the off-center fastener hole.
The tensioner pulley #6 has the attach fastener hole on center.

The bearings #5 on the pivot shaft are not sealed. They can get dirty and seize causing the tensioner action to become sluggish or non existent allowing the belt to slip, most likely on the alternator pulley.

I have brinelled the pivot shaft with bad bearings attempting to release pressure during belt installation.


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Old Wed, Nov-14-2018, 02:44:50 PM   #6
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

I replaced my idler pulley last year. I was sure that was the one squealing after I used a stethoscope. It wasnít.

I just ended up ordering all new tensioners, pulleys, and belts. Perfectly quiet again.

It just didnít seem worth it to keep troubleshooting when they all had 100k on them anyway.
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Old Wed, Nov-14-2018, 03:14:21 PM   #7
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

FCP euro, replace all
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Old Wed, Nov-14-2018, 03:19:58 PM   #8
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

There is the water on the belt trick to rule out any misalignment/belt issues with it causing the pulley to have a side force but agreed you should probably replace them all it will make a huge difference immediately and its not very hard to do. I just did mine. Also suggest the Conti gatorback belts if youre going to go all in that stops all belt noise.
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Old Wed, Nov-14-2018, 04:55:59 PM   #9
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

Quote:
Originally Posted by Braymond141 View Post
I agree with Omair. I gave up picking away at these common failures and just do everything when due.

My answer is to do it all new.
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Originally Posted by fattycharged View Post
FCP euro, replace all
I just ordered this yesterday.

https://www.fcpeuro.com/products/bmw...-11287636378kt




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Old Wed, Nov-14-2018, 05:16:15 PM   #10
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Default Re: Squeaky belt/pulley/tensioner - help diagnose

All right gents, sounds good, I'll just replace all.
Thanks!
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Discussing Squeaky belt/pulley/tensioner - help diagnose in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)