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Old 06-07-2012, 11:47 PM   #1
tomb25
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Anyone know what this noise is?

Hi,

So for about a week or so i have been getting this 'whining' 'squeaking' noise coming from what i think is the fan belt. My Dad reckons it was just a noisy fan belt and a bit of dry soap would stop the noise. I tried that but no luck.

Starting to now think it may be a bearing in the tensioner or idler pulley
But my knowledge of car mechanics isn't that great.

Below is the video of the noise

Any assistance would be great.

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Old 06-07-2012, 11:52 PM   #2
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Does it get louder as your RPM's pick up?
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Old 06-07-2012, 11:55 PM   #3
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Does it get louder as your RPM's pick up?
yes it does

Last edited by tomb25; 06-08-2012 at 12:00 AM. Reason: quoted text
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Old 06-08-2012, 03:51 AM   #4
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Pretty sure its your pulleys mate.
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Old 06-08-2012, 03:54 AM   #5
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supercharger!
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Old 06-08-2012, 04:00 AM   #6
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oh and a word of advise, DON'Trun the car with the air filter taken off like that, if anything gets sucked in there, your screwed big time!
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Old 06-08-2012, 05:50 AM   #7
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yes it does
Ok, have you had your belts or pulleys changed recently?

My car was making that noise quite similar to that after I got it back from having belts/pulleys changed, made a kind of high pitched supercharger whine. Once the car was fully warmed up though, it disappeared.

I used some WD40 on it, gave it a spray. Haven't had any issues since.
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Old 06-10-2012, 09:14 AM   #8
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My 328i made the same noise for about a month and a half, it was the idler pulley bearing eating itself, eventually it failed completely and shredded the belt, lost power steering alternator and cooling all at once on a bend, scary thing to happen. Get it to a shop, I didn't and it cost me far more than it should have.

For the record, my dad told me the exact same thing, that it was normal and to forget it, but he didn't cover the extra $500 on the repair bill his advice caused, I'm certain yours won't either lol
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Old 06-10-2012, 07:51 PM   #9
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Did you get a scar on your hood liner from the belt? Belt snaps is seriouz bizness...
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Old 06-10-2012, 09:13 PM   #10
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Originally Posted by 11EAS View Post
Ok, have you had your belts or pulleys changed recently?

My car was making that noise quite similar to that after I got it back from having belts/pulleys changed, made a kind of high pitched supercharger whine. Once the car was fully warmed up though, it disappeared.

I used some WD40 on it, gave it a spray. Haven't had any issues since.
Mine seems to get worse as my car gets warmed up.

Belt was changed about a 30,000 km's ago so it should still be good. I'm unsure when the pulleys were changed. I think i'll go ahead and order an idler pulley and changed it over asap.
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Old 06-10-2012, 09:15 PM   #11
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My 328i made the same noise for about a month and a half, it was the idler pulley bearing eating itself, eventually it failed completely and shredded the belt, lost power steering alternator and cooling all at once on a bend, scary thing to happen. Get it to a shop, I didn't and it cost me far more than it should have.

For the record, my dad told me the exact same thing, that it was normal and to forget it, but he didn't cover the extra $500 on the repair bill his advice caused, I'm certain yours won't either lol
Good to hear feedback from someone who has had the same issue (Not good that it actually happened to you in the first place). Thanks for the information mate
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Old 06-11-2012, 01:03 AM   #12
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i had this same issue on my old car

tensioner bearing and idler pulley fixed the problem.
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Old 06-11-2012, 01:26 AM   #13
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Yea I was having that sound for a while. You can actually replicate it if you get the pulleys/belts wet.

My water pump ended up collapsing, had to stop right away, the serpentine belt didn't snap, it twisted on to itself inside one of the pulleys and got entangled in there.
Don't continue driving if and when this happens to you, no water is being pumped into the car, you could seriously damage the head gasket, it becomes harder to steer also as the power steering pump fails and the alternator loses charge as it fails also, this belt pulls and runs a few systems on our car.

When I got it repaired cost me around 1k, but I got all new OEM pulleys as they were all squeaky/dry and not rotating smoothly, new OEM water pump and new serp and air con belt.
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Old 06-11-2012, 04:31 AM   #14
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Did you get a scar on your hood liner from the belt? Belt snaps is seriouz bizness...
When the bearing went, the belt actually jammed behind the pulley and snapped, and it took out the top cooling hose (like sliced right through the underside of it) so the scenario is battery light came on, went to turn a sharp corner, steering wheel was stiff as hell, nearly crashed, pulled over right away and shut off the motor, then as the car stopped like 3L of coolant sprayed everywhere. Was a pretty impressive failure really, and all that happened within 20 seconds.
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Old 06-11-2012, 06:18 PM   #15
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Even if the belts are only 30K km old, they are only $25 each so worth replacing seeing you'll be in there anyway.

As suggested check out the water pump bearing and it might be an idea to check power steering pump and AC compressor as well. Easy to do with the belts off - just check for wobble or play.

GL!
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Old 06-12-2012, 01:24 PM   #16
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There are 2 ways of dealing with this.
1) Remove the belt, spin the tensions and pulleys by hand and you may feel which bearing is going
2) While the car is running you can put a a stethoscope to the tensions and pulleys and you'll hear which one is the squeaky wheel.
You should know that the tensions and pulleys all have a similar life span and should be replaced all at the same time. Replacing them all will cost you a bit more in parts but save hundred in labor, since you'll have to mechanic will have to tear everything down again each time he has to go in there.
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Old 06-12-2012, 02:01 PM   #17
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Yep, I had the same noise on mine too, changed the idler pulley and hey presto all back to normal.
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Old 06-12-2012, 07:59 PM   #18
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Quote:
Originally Posted by dsio View Post
My 328i made the same noise for about a month and a half, it was the idler pulley bearing eating itself, eventually it failed completely and shredded the belt, lost power steering alternator and cooling all at once on a bend, scary thing to happen. Get it to a shop, I didn't and it cost me far more than it should have.

For the record, my dad told me the exact same thing, that it was normal and to forget it, but he didn't cover the extra $500 on the repair bill his advice caused, I'm certain yours won't either lol
+1 its a dry bearing noise.
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Old 06-13-2012, 08:43 AM   #19
tomb25
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thanks everyone for their help.

I ordered a new idler pulley and main tensioner pulley and installed them earlier today.

Noise = Gone
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Old 06-13-2012, 09:07 AM   #20
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Good stuff

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