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Discussion Starter #1
BMW X3 F25, 2011, x28i
The car has around 116K miles on it.

Recently had a new a/c compressor put in. After which the car started sounding weird. Earlier it was just a low whirring which would go away when the a/c would be turned on, but I think the a/c fan overshadows the actual noise and it gives the impression that the noise has gone away.

However, its cooler these days and do not need the a/c anymore, temperature is around 25C or 77F outside.

So the car sounds like this continuously.

It does have a top cover gasket and an oil filter gasket leak which I haven't addressed as yet. Also, recently noticed a small coolant leak under the driver side area, for which I just received a low coolant warning today.

I have uploaded the video, in the hope that someone would know what this sound can be? I asked my mechanic and he just said that it's the winter and thats why the belts are a bit more rigid. I've owned the car for the last 4 years and in the past 4 winters this was not the case.

I am just worried of something going bust, asking you folks to perhaps understand and avoid a big repair. All help is appreciated.

Thank you

Youtube:

https://youtu.be/udsAdqlNd5g

https://youtu.be/-ciO1jVOlSs

https://youtu.be/h9IcTugKubI

https://youtu.be/L5QH_FJfxSE
 

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You have an early N20 or N26 engine. They're known for having timing chain and guide failures. The first sign is noise. The last sign is the "replace engine" light coming on. BMW fixed the problem with 2015 production, and the redesigned parts fit onto earlier engines.

But, it could be that the belts are too tight or not tight enough.
 

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@Autoputzer

This is an inline 6 cylinder - N52 Engine. I believe the timing belt failure was most frequent on the N55 x35i turbo models. I've read about that, I am not sure if this is an issue with the N52 as well or not. Have not found any threads with the timing belt problem affecting the N52.
 

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@Autoputzer

This is an inline 6 cylinder - N52 Engine. I believe the timing belt failure was most frequent on the N55 x35i turbo models. I've read about that, I am not sure if this is an issue with the N52 as well or not. Have not found any threads with the timing belt problem affecting the N52.
Oops. My bad. The N20 and N26 are four-cylinder turbo's, badged as "...28i" cars. The N26 is a low-emission version.
 

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We replaced timing chain guides, oil pump gasket etc. at about 70K miles on our 2011 X3 35i. It's worth doing to avoid the much bigger cost of a total engine failure...
 
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