What the HELL is making this NOISE???? - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 08-07-2004, 07:55 PM
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Alright, I will first explain the noise I hear (again).

It's a high pitched squeeling noise that gets much louder once the shifter is in drive. It also gets louder once the AC is turned on.

You might say it could be the belts? Well, been there! Changed them all! Yet, the noise remains!

I then discover I have a leak in my radiator so I think maybe this could also be the cause of the noise. Possibly the steam coming from the leak? Nope! New radiator and the noise persists! I also change the air filter (which wouldnt be directly the cause but thought maybe it was air squeezing through a dirty or leaky filter, but nope! Still there!

Could a water pump make this noise? I have yet to replace that. That is the only thing I can think of!

If that is the case I probably will have to remove the radiator I just installed! Ugh!


Please give me your feedback guys! I'm very curious to see if you have similar issues or know what the problem may be!

Thanks!

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#2 (permalink) Old 08-07-2004, 08:33 PM
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Sounds like typical belt squeal which gets louder when more load is placed on the belts. If the belts are new then it probably is that they aren't tensioned properly or something is wrong with one or more of the pulleys.
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#3 (permalink) Old 08-07-2004, 09:03 PM
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This link gives good tips for troubleshooting belt squeal.http://www.gates.com/brochure.cfm?brochure=1026
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#4 (permalink) Old 08-07-2004, 10:10 PM
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just had this problem fixed on my car turns out a couple of the tensioners were
bad, i have heard about others 325ers with this problem, the worst tensioner was by the alternator. hope this helps
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#5 (permalink) Old 08-08-2004, 04:33 AM
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What exactly is the tensioner? The pulley? Or what is it? sorry if this is a silly question.

But in concern with the belts i had them installed by a professional at the proper tension. They should be fine theyre brand new profressionaly installed!

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• High-flow intake w/ Green Performance Filter
• 17 x 8.5 BMW Style 44 Rims
• <u>Pirelli</u> P6 tires 235/45/17
• M3 Spoiler
• Clear Tail Lights, Corners, and Side markers
• 20% Tint all around
• Sylvania Silverstar Bulbs
• <u>Alpine</u> 9831 MP3/CD Player
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#6 (permalink) Old 08-08-2004, 08:33 AM
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One of the pulleys is attached to something that looks like a shock absorber which automatically puts the correct pressure on the belt. If it's not working properly your belt will be loose. This is not something that a mechanic would routinely check. Also, one of the pulleys could be misaligned, loose or worn, and this is also something that wouldn't normally be checked.
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#7 (permalink) Old 08-08-2004, 08:45 AM
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This is what it looks like. Number 8 is the tensioner.
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#8 (permalink) Old 08-08-2004, 10:17 AM
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Thanks !

Any idea on how to check them?

BLACK 1995 BMW E36 325i
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• High-flow intake w/ Green Performance Filter
• 17 x 8.5 BMW Style 44 Rims
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• Clear Tail Lights, Corners, and Side markers
• 20% Tint all around
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#9 (permalink) Old 08-08-2004, 10:18 AM
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I was told a stethoscope is great for pinpointing a noise in the engine bay. I will try to use this and locate the specific location the noise is derived from and get back to you guys. Thanks a lot!

BLACK 1995 BMW E36 325i
• <u>Dinan</u> Performance Software - SOLD!
• High-flow intake w/ Green Performance Filter
• 17 x 8.5 BMW Style 44 Rims
• <u>Pirelli</u> P6 tires 235/45/17
• M3 Spoiler
• Clear Tail Lights, Corners, and Side markers
• 20% Tint all around
• Sylvania Silverstar Bulbs
• <u>Alpine</u> 9831 MP3/CD Player
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#10 (permalink) Old 08-08-2004, 01:45 PM
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do u have a stereo system.... sounds like an aftermarket amp issue with alternator whine
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#11 (permalink) Old 08-08-2004, 03:57 PM
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Could also be the clutch fan bearing.

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#12 (permalink) Old 12-23-2007, 01:59 PM
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Whining noise in belts and pulleys

Hopefully this problem was solved. I have a similar but different problem on my '96 328ic (160k miles). My whining noise seems to be coming from the general area of the pulleys and belts but only happens after I stop fast at a light. The car runs fine, standard engine noise, if I brake soft and roll up to a stop sign or traffic light all is well. The moment I jump on the brakes for whatever reason I immediately get a whining noise that is lower in pitch in idle and goes higher in pitch as I accellerate. It doesn't usually go away until after I stop at my destination park for a time, come back and start the engine and drive off. Then it's back to fine until the next quick stop. Brother said low oil, nope, topped it up. Bearings? Why doesn't it happen all the time?

I did have the alternator replaced 4 months ago, had a little whine every once in a while but went away in 5 minutes and didn't return for 2 weeks or so each time. Now every time I stop short the whining begins. I am almost sure it's not coming from the alternator as I have heard that the Bosch brands can whine a little from brushes? I have put my ear right next to the alternator and no whine. Seems to be coming somewhere else.

Any thoughts?

Brian
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#13 (permalink) Old 12-23-2007, 03:01 PM
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waterpump? maybe the extra force on it jogs it and the bearing squeaks.... when was it last changed?

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#14 (permalink) Old 12-23-2007, 06:48 PM
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Never been replaced. If it were bearing though wouldn't it whine constantly?

-Brian
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#15 (permalink) Old 12-23-2007, 07:16 PM
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Also, if the water pump had problems would the car run hot or over-heat. It stays at normal temperature at start or after driving a lot. What about power steering pump. When it's cold in the morning my first left or right turn causes a whine that only happend once or twice and then is fine through the day. The whine is very similar to the other whine but when it happens it doesn't continue. No whine until I hit the brakes hard. Frustrating...
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