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E90 serpentine belt
Published by TwinT1addict
11-29-2011
E90 serpentine belt

Anyone on here that can give me some advice of how to go about changing my belt I have 72000 miles and it\'s giving me an annoying squeal on cold start. I\'m new at this and can use some insight . Thanks
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  #1  
By fizzerd on 11-30-2011, 09:42 AM
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Can it not be a bushing or pulley?
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  #2  
By TwinT1addict on 11-30-2011, 04:36 PM
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Quote:
Originally Posted by fizzerd View Post
Can it not be a bushing or pulley?
i ruled that out it makes this crazy ugly sh sht sht noise when cold then its fine when warm lol
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  #3  
By Express on 11-30-2011, 04:38 PM
try to tighten the belt with the tensioner first...
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  #4  
By kiwi29 on 12-06-2011, 06:18 AM
try using belt dressing as well, it could be dried out
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  #5  
By TwinT1addict on 12-06-2011, 07:56 AM
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Quote:
Originally Posted by kiwi29 View Post
try using belt dressing as well, it could be dried out
thanks will do
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  #6  
By herbaljim on 12-07-2011, 05:47 PM
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Please advise if any of the solutions mentioned above works. I've had the same problem for over a year. It only happens when temperatures drop down to the 40's or so. I had the belt looked at during my annual inspection last December and the dealer said everything looked fine with the belt/tension. And of course they couldn't get it to squeal since it was warmed up from my drive to drop it off.
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  #7  
By TwinT1addict on 12-07-2011, 09:11 PM
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Quote:
Originally Posted by herbaljim View Post
Please advise if any of the solutions mentioned above works. I've had the same problem for over a year. It only happens when temperatures drop down to the 40's or so. I had the belt looked at during my annual inspection last December and the dealer said everything looked fine with the belt/tension. And of course they couldn't get it to squeal since it was warmed up from my drive to drop it off.
I feel kind of weird using the dressing. But I'm pretty sure it's the belt.
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  #8  
By mikekilpatrick on 12-07-2011, 09:15 PM
Go onto Ebay and buy the OEM Factory service manual for 18 dollars or less shipped. It will walk you through every repair procedure on our cars...
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  #9  
By ENINTY on 12-17-2011, 09:09 AM
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It is most likely a bearing in one of the pulleys. The belt would only squeal if the tension was wrong. A classic belt squeal comes from the belt slipping on the surface of one of the pulleys rather than rotating the pulley, which only occurs if the belt tension is incorrect (i.e. loose). The tension is constantly and automatically set by the belt tensioner because the tensioner is free-floating and the tension is set by the coiled spring in the tensioner arm. So the squeal is either the tensioner is bad because the load of the spring is not being properly transferred to the belt (this is usually not the case), or the bearing in the pulley on the tensioner arm is going bad, or the bearing in the idler pulley is going bad. It squeals when it is cold (first started up) because the bearing has set overnight and is cold and smaller in dimension than when it warms up, which lets the ball bearings inside the (sealed) bearing races slide around rather than rotate between the races, or the bearing is temporarily frozen (or slow) and belt is sliding on the pulley surface until the pulley starts to rotate at the proper speed. Once the bearing warms up a bit the dimensions of it change and it starts working almost normally.

It is easy to check for a bad pulley bearing. Just remove the belt and free-spin both the tensioner pulley and the idler pulley. If either does not spin freely and smoothly, and is "grainy" (like there is sand in it), then the bearing is going bad.
Last edited by ENINTY; 12-18-2011 at 09:54 AM.
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  #10  
By AlanAZ on 12-18-2011, 09:14 PM
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Is it recommended to replace the idler and tensioner pulleys when replacing the belt as it it on some other cars?

Update: I took my belt off, and spun the pulleys, and both are shot (spins easy, sounds gravelly) @ 80K mls. So I'll be replacing the lot.
Last edited by AlanAZ; 01-24-2012 at 02:46 PM.
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  #11  
By Handsome_Rob on 12-22-2011, 01:30 PM
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Mine makes the noise as well. sht sht sht sht. Makes it when its cold and when its warm. I hit the tensioner with some wd40 and it stops but only for a second. Same result with silicon spray. I feel your pain.
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