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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Question about noise in serpentine belt area - 2011 335i n55



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      01-17-2015, 09:39 PM   #1
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Lightbulb Question about noise in serpentine belt area - 2011 335i n55

Well, I just switched my 2007 328i for a 2011 335i, and I'm very glad with the upgrade, it's like drive a vespa scooter and a Kawasaki Ninja.

Well everything on the 335i is great, the only thing I have noticed as of today is that when I start the car in the mornings I hear a little clunk in the serpentine belt area that goes away just 2-3 minutes after the car gets a little warm, today my son and I just replaced the Serpentine belt (by the way, we didn't need to remove the fan from the car to replace it) but the noise is still there when the car is cold in the mornings, I'll try to replace the serpentine belt tensioner next, but I just need to know if anyone here was on the same boat with this kind of problem and if anyone have found a solution to this issue.

Thanks a lot for all your support, this is the best forum, I have learned a lot from all of you and I'm very confident to work on my car thanks to this forum.

Blessings to all !
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      01-17-2015, 09:54 PM   #2
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Any previous oil leaks? Oil on the belt usually causes all kinds of noises, in my experience anyways
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      01-17-2015, 10:18 PM   #3
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No oil leaks at all on any area.
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      01-17-2015, 10:20 PM   #4
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I have heard a squeaking/whining sound from up there occasionally. Of course the dealer "could not replicate"

I'm also 2011 N55
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      01-18-2015, 08:20 AM   #5
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Quote:
Originally Posted by humbertob
Well, I just switched my 2007 328i for a 2011 335i, and I'm very glad with the upgrade, it's like drive a vespa scooter and a Kawasaki Ninja.

Well everything on the 335i is great, the only thing I have noticed as of today is that when I start the car in the mornings I hear a little clunk in the serpentine belt area that goes away just 2-3 minutes after the car gets a little warm, today my son and I just replaced the Serpentine belt (by the way, we didn't need to remove the fan from the car to replace it) but the noise is still there when the car is cold in the mornings, I'll try to replace the serpentine belt tensioner next, but I just need to know if anyone here was on the same boat with this kind of problem and if anyone have found a solution to this issue.

Thanks a lot for all your support, this is the best forum, I have learned a lot from all of you and I'm very confident to work on my car thanks to this forum.

Blessings to all !
Crank shaft pulley
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      01-18-2015, 10:23 AM   #6
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crank shaft pulley

is is hard to replace the crank shaft pulley ? I'm very mechanically inclined.
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      01-18-2015, 11:09 AM   #7
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I've got the same thing. Indy told me it was my tensioner. Will be trying to get dealer to replace next week under warranty.
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      01-18-2015, 05:34 PM   #8
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Hope mine's the tensioner too, the crankshaft pulley is $500 and very hard to replace !
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      01-18-2015, 10:39 PM   #9
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Quote:
Originally Posted by humbertob View Post
Hope mine's the tensioner too, the crankshaft pulley is $500 and very hard to replace !
I have changed twice in a month on the pulleys and belts.

Lastly it was the crank shaft pulley ...

It was not under warranty as usual by dealership ... crap excuses. changed it and sound gone!
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      01-18-2015, 10:48 PM   #10
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How much did you pay for parts and labor ? did you get the car to the indy or stealership ?
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      01-18-2015, 11:34 PM   #11
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Quote:
Originally Posted by SUPAN
Quote:
Originally Posted by humbertob View Post
Hope mine's the tensioner too, the crankshaft pulley is $500 and very hard to replace !
I have changed twice in a month on the pulleys and belts.

Lastly it was the crank shaft pulley ...

It was not under warranty as usual by dealership ... crap excuses. changed it and sound gone!
Can you describe the sound you were getting?
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      01-19-2015, 10:30 PM   #12
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Quote:
Originally Posted by Jsoboti View Post
Can you describe the sound you were getting?
sounds like there are a couple of crickets there in the engine bay.

switch off your radio and if you going steep up slope or downslop .. u will hear it ...
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