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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 01-29-2013, 07:45 PM   #1
XKR
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Possible Belt Noise

This noise is new and it's honestly the most annoying thing ever. It's really loud when the engine is warm but on a nice day it'll do it for about 5 minutes but if it's a cold day it will be doing it for about 25min without going away. It seems like it's a belt but I could be wrong. It does match the RPM but if I'm driving and it's making the noise, I usually put it in neutral and it stops for that moment. At low speeds it usually don't happen if the engine is under 2k RPM. Can and one identify where this noise is coming from and if so how to solve it??! Here's a quick video and much help is needed. I really appreciate any help I can get
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Old 01-29-2013, 11:53 PM   #2
Zert
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I suggest you remove the 2 belts, start and rev the engine, if its running smoothly the noise is coming from either the belt, rollers or tensioners.
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Old 01-30-2013, 10:04 AM   #3
choxor
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Open hood the hood and listen? It should be fairly obvious.
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Old 01-30-2013, 02:10 PM   #4
XKR
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Originally Posted by choxor View Post
Open hood the hood and listen? It should be fairly obvious.
Well the source of the noise is obviously a belt but I'm ruling out other factors so I can get a good idea of what I need to do to fix it so I don't waste time.
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Old 01-30-2013, 03:03 PM   #5
illestminimike
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While you are in there might as well change the water pump, tensioner and other pulleys.
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Old 01-30-2013, 08:59 PM   #6
mgilardi86
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I chased a noise like that replaced a ton of belt and accessory, ended up being the throwout bearing
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Old 01-30-2013, 09:04 PM   #7
XKR
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Originally Posted by mgilardi86 View Post
I chased a noise like that replaced a ton of belt and accessory, ended up being the throwout bearing
Even if I do end up changing everything, it wouldn't be a big deal because it's over due for a service so new belts and stuff wont hurt at all. At least I have a few leads to go onto. The weirdest thing happen with that noise today; I started my car in the garage and it was about 35 degrees in there and it was really warm out side like around 60 degrees and it was making that noise like in the video but the moment it hit warm air it stopped.
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Old 02-24-2013, 05:12 PM   #8
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Could an idler pulley make this noise?
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Old 03-09-2013, 09:33 AM   #9
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SOLVED!! It was the bearing inside the idler pulley, so no belts had to be changed. The bearing was very dry and all worn out.
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Old 05-05-2013, 01:48 AM   #10
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how does one change this bearing? any step-by-steps? how long does it take? part number? costs? thanks in advance...my M has been garaged for several months and when I take it for a spin, I always hear that belt noise. Thanks!

Edit: did some more reading on this and I suppose the bearing is just a part of the pulley...in your case it was the idler pulley, so replacing the pulley solved your problem. How would I be able to check whether its the tensioner pulley?

If you're changing these belts and pulleys, would it be wise to also change the water pump and thermostat while you're in there? not sure if the latter is something that takes minutes to do while you're doing the former. My car has 96K miles so wasn't sure when this stuff needs to get replaced. I only driver her on select weekends when it's warm. I travel so much that she's parked in the garage 80-90% of the year
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Old 05-05-2013, 01:00 PM   #11
XKR
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Originally Posted by fayraree View Post
how does one change this bearing? any step-by-steps? how long does it take? part number? costs? thanks in advance...my M has been garaged for several months and when I take it for a spin, I always hear that belt noise. Thanks!

Edit: did some more reading on this and I suppose the bearing is just a part of the pulley...in your case it was the idler pulley, so replacing the pulley solved your problem. How would I be able to check whether its the tensioner pulley?

If you're changing these belts and pulleys, would it be wise to also change the water pump and thermostat while you're in there? not sure if the latter is something that takes minutes to do while you're doing the former. My car has 96K miles so wasn't sure when this stuff needs to get replaced. I only driver her on select weekends when it's warm. I travel so much that she's parked in the garage 80-90% of the year
I wish i had better answers for you but I basically let my mechanic find this and solve this problem lol. He used an Automotive Stethoscope to diagnose this problem. If i were changing the belts then I would definitely change the waterpump also but since it was just the pulley and the bearing inside it, I didn't have to. It took him about 30 mins to do it; it was also done as a favor so I don't know how much it cost or where they got the part from. Next time I come in contact with them, I'll ask them more details on it and get back to you check this out for the part number, http://realoem.com/bmw/partgrp.do?mo...id=47708&hg=11 It's in one of the submenus but I'm not sure which one. I hate to hear that you don't get to drive her that often! I can't go more than a week without touching mine. Good luck on your search to find this problem
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Old 05-05-2013, 01:34 PM   #12
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Possible Belt Noise

Thanks! Appreciate the follow up. Thinking of taking her to Obioban (from m3forum) in PA.


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Old 05-06-2013, 12:12 PM   #13
dillard
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Not to hijack the thread...

How hard is it to change the belts? I have two new ones sitting in my garage that I've been wanting to install.

I heard you do it from the bottom. Looks tight.

Any suggestions/advice?
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Old 05-06-2013, 11:35 PM   #14
sakumaxp
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when my car made noise on cold starts, and it went away after it warmed up, it turned out to be my idler pulley was on its way to seizing up. so after i changed the pulley no more nasty sound on start up. good luck
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