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Discussion Starter #1
Dear all,

I've been reading this forum for a while but unfortunately it's my turn to dive in and post one of my worries of the day. After a one hour drive mostly on the highway, I came home to this worrying engine noise on my 2011 E93 (N55) with 64k miles. I'd like to know if anybody, by any chance, ran into a similar issue so that I can deal with it, and maybe get it to the dealer.

The reason why I'm posting is because I'd like to know a little more before before going.

Here is a video recording:
https://www.youtube.com/watch?v=Ehko98fQsFA

Thanks for your help!!

Jp_a_
 

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That almost sounds like a failing bearing on one of your accessories. I would start by pulling the serpentine belt and checking each accessory and idler by spinning each and listening for any bearing noise. You can also start the engine with the belt off to confirm that the noise is accessory or idler related. That's where I would start based on what I can hear from the crappy speaker on my laptop.
 

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I've had good experiences with a mechanic's stethoscope. By touching the end to various parts I was able to identify a failing steering pump, another time noisy valves. You can sort of do the same thing with a screwdriver; stick the handle to your ear and the blade on various components. Just be careful not to get something caught in a moving part.
 

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Maybe its just the belt itself. Can you see any belt damage?
 

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I am having the EXACT same issue

Hi - This is also my first time posting on this forum even though I have used it as a reference for years now. I have a 2011 335i Convertible with 63,000 miles and am having the EXACT same issue. The noise is literally identical and it just started making that sound within the past two weeks. I don't drive it everyday because I am fortunate enough to be able to ride a bike to work.

Have you had any luck with figuring out what the issue is?

There are several auto shops in my area that work on BMWs but unsure if that is a smart move or if I should take it to the dealership. I have an extended warranty that expires in 16 days, although I am guessing it won't cover this problem. If I wasn't upside down on this stupid car with what I owe on it, I would get rid of it.

The sticker when the car was new says my car is 3.0 Liter Dual Overhead cam (DOHC), 24 valve inline turbocharged 300-HP 6-cylinder engine with Twin Power Turbo technology, Valvetronic and Double-VANOS steplessly variable valve timing, if engine types make a difference.

Thanks!
 

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Discussion Starter #6
Hi all,

After a tour at a BMW specialized dealer near where I live it seems the issue is related to oil leaks causing oil splashes at multiple locations within the engine. Here are a couple of pictures showing the mess:

http://i.imgur.com/5uxLm2h.jpg
http://i.imgur.com/YJBEbNm.jpg
http://i.imgur.com/FTY4UUc.jpg
http://i.imgur.com/DZsH6rv.jpg

Problem is the belt (in the last picture) is right under the housing gasket that is leaking, so it is likely that is the reason for the sound.

Diagnosis by the dealer:
- Oil Pan Gasket Leaking
- Valve Cover Gaskets leaking
- Oil Filter Housing Gasket Leaking

Total repair cost is high, due to high labour time. The Oil Pan Gasket requires the front suspension to be removed in order to get access.

Your situation might be different, but in any case you SHOULD have your car looked by a specialist, because if it is very close to the sound of my car, it could be something bad for your engine.

Let us know the situation!

Jp
 

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I'm not a BMW technician, however I wouldn't think oil leaking on a belt would cause the issue. The belt would get wet with oil and slip but would not make a noise like a failing bearing. If you are leaking enough oil to coat the belt then you would see plenty of oil spotting in your driveway or on your garage floor. If that were the case you would be losing enough oil to have to add more than a quart in between oil changes. Do yourself a favor, before spending the money at the dealer replace the belt yourself or have an independent shop replace it for you. Clean all of the belt's contact points on the accessories and start the engine. I would think that the noise would still be there.

On the flip side, if the leak were slow enough and the belt were slowly coated over time, enough that it would deteriorate and lose some of its rigidity then you may see it wobble and it could make a noise similar to a failing bearing. I have heard a noise similar on older v-belt setups, but its mostly due to a bad bearing.
 

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Sounds like your water pump pulley bearing are worn off. Replace Waterpump it should work fine and also check your tensioner and thermostat. Coz it's all on same area
 

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Diagnosis Not Good

I just took mine in today to a local shop that specializes in BMWs. Mine is leaking oil as well even though I couldn't see it before when I popped the hood. It is leaking in three different locations: oil filter housing, oil pan gasket, and the valve cover gasket.

They said the noise is coming from the serpentine belt roller. I thought it was the water pump starting to go bad because the temperature has been fluctuating the few times I have driven it in the past month.

My question is that if it is leaking oil in three places, wouldn't the car be low on oil? The computer in the car said it is completely filled to the max. BMW had the car for a month back in April fixing my window that was broken by vandals. They serviced the car during this time which included an oil change. I haven't even put 1,000 miles on the car since getting it back the first week in May.

Is it really possible this issue just popped up?
 

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I just took mine in today to a local shop that specializes in BMWs. Mine is leaking oil as well even though I couldn't see it before when I popped the hood. It is leaking in three different locations: oil filter housing, oil pan gasket, and the valve cover gasket.

They said the noise is coming from the serpentine belt roller. I thought it was the water pump starting to go bad because the temperature has been fluctuating the few times I have driven it in the past month.

My question is that if it is leaking oil in three places, wouldn't the car be low on oil? The computer in the car said it is completely filled to the max. BMW had the car for a month back in April fixing my window that was broken by vandals. They serviced the car during this time which included an oil change. I haven't even put 1,000 miles on the car since getting it back the first week in May.

Is it really possible this issue just popped up?
It's possible that it's barely seeping oil. Just a little makes a mess, and it won't show your oil level dropping at all.
 

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Dear all,

I've been reading this forum for a while but unfortunately it's my turn to dive in and post one of my worries of the day. After a one hour drive mostly on the highway, I came home to this worrying engine noise on my 2011 E93 (N55) with 64k miles. I'd like to know if anybody, by any chance, ran into a similar issue so that I can deal with it, and maybe get it to the dealer.

The reason why I'm posting is because I'd like to know a little more before before going.

Here is a video recording:
https://www.youtube.com/watch?v=Ehko98fQsFA

Thanks for your help!!

Jp_a_
Hey there, came across your post for the issue u were having w ur bmw. I have same model year and trim, and just recently started noticing that weird squeal from my car. The weird part is that it only does it when it's cold, and as the temperature regulates it completely stops. Did your car start the same? Any info would be appreciated. Thanks!
 
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