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      06-24-2015, 10:13 AM   #1
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Thumbs down 2011 N55 Squeaking Engine

I've tried already, no results.

Starting last week, I have been hearing an audible squeaking/squealing coming from the engine bay. Early last week, I also installed a VRSF Catless Downpipe, COBB Cat-back exhaust, and O2 Simulators. Now, I don't think the squealing is due to the mods because the car just hit 50,000 miles and is due for service. I've attached a few videos below. Crankshaft pulley issue? Serpentine belt?

I'm asking your help, and will talk to my indy shop before brining it in to BMW. I am still under CPO warranty, and worried I will have to switch out the VRSF DP in order to bring it in to BMW:

https://youtu.be/7Y6Vn1ErVfo

https://youtu.be/-MmLl9bHBnU
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      06-24-2015, 10:56 AM   #2
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definitely sounds belt-related. Check the condition of your belt and pulleys. Tensioner and idler pulleys are likely culprits.
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      06-24-2015, 11:20 AM   #3
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Remove the belt and run the car for a few seconds, does it go away?
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      06-24-2015, 10:22 PM   #4
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Just pour some water in the belt area with car idling, if squeak disappears then you need to replace your belt and tensioner. Easy DIY !
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      06-24-2015, 11:02 PM   #5
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Quote:
Originally Posted by humbertob View Post
Just pour some water in the belt area with car idling, if squeak disappears then you need to replace your belt and tensioner. Easy DIY !
Then I "need" or "don't need" to replace the belt and tensioner? And wouldn't that be only a temporary fix? Since the water will dry out? It's still hitting 90 degrees where I am.
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      06-24-2015, 11:13 PM   #6
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Pouring water is just to make sure that the culprit is the tensioner and/or belt, not to remedy the issue ! You still need to replace the tensioner and belt !
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      06-24-2015, 11:15 PM   #7
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Quote:
Originally Posted by humbertob View Post
Pouring water is just to make sure that the culprit is the tensioner and/or belt, not to remedy the issue ! You still need to replace the tensioner and belt !

Gotcha, thanks!
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      06-24-2015, 11:25 PM   #8
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What the hell is that knocking sound?

Sounds worse than my n54 on a cold start
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      06-25-2015, 01:55 AM   #9
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my advise... change those tensinor(s), pulley(s) and belt regardless if you haven't before...

trust me... it worth spending the 250 dollars if you haven't done it before because it WILL fail and it will leave you stranded even worse... damage your engine
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      03-22-2017, 02:27 PM   #10
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jdhiman Hey what ended up being the cause of that squeak? I have the same car and I am currently hearing that exact same squeak, trying to figure out if its the belt tensioner or idler pulley. Thanks!
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      03-22-2017, 02:29 PM   #11
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Quote:
Originally Posted by MSuperE92 View Post
jdhiman Hey what ended up being the cause of that squeak? I have the same car and I am currently hearing that exact same squeak, trying to figure out if its the belt tensioner or idler pulley. Thanks!
Hey there, it's quite possibly both. I would go get it checked immediately. Chances are the belt will shred and go into the engine, requiring a $5-6K repair.

Have them replace the belt and pulley and you should be ok.

Good luck
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      03-22-2017, 02:34 PM   #12
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squeaks and chirps are usually belts and pulleys
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      03-22-2017, 06:33 PM   #13
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Thanks! I'm planning to replace both of them, hopefully that solves the problem!
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      03-22-2017, 10:24 PM   #14
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Quote:
Originally Posted by MSuperE92 View Post
jdhiman Hey what ended up being the cause of that squeak? I have the same car and I am currently hearing that exact same squeak, trying to figure out if its the belt tensioner or idler pulley. Thanks!
I did all of mine at once, mainly because one of the pulleys in the tensioner was wobbling and they're not separately replaceable (well...technically you could, but there's a lot of effort and unknowns). Here are the parts you'll need:

Tensioner assembly: 11287582946
75mm idler pulley: 11287578674
90mm idler pulley: 11287578675
Drive belt: 11287628650

With tensioner: $180.38
Without tensioner: $87.78

And, some time this year, you'll be able to upgrade your power steering pulley from plastic to aluminum courtesy of Hamburg-Technic! That part number is 32427582947.
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      03-22-2017, 10:28 PM   #15
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Quote:
Originally Posted by Welcome to NBA Jam View Post
Quote:
Originally Posted by MSuperE92 View Post
jdhiman Hey what ended up being the cause of that squeak? I have the same car and I am currently hearing that exact same squeak, trying to figure out if its the belt tensioner or idler pulley. Thanks!
I did all of mine at once, mainly because one of the pulleys in the tensioner was wobbling and they're not separately replaceable (well...technically you could, but there's a lot of effort and unknowns). Here are the parts you'll need:

Tensioner assembly: 11287582946
75mm idler pulley: 11287578674
90mm idler pulley: 11287578675
Drive belt: 11287628650

With tensioner: $180.38
Without tensioner: $87.78

And, some time this year, you'll be able to upgrade your power steering pulley from plastic to aluminum courtesy of Hamburg-Technic! That part number is 32427582947.
Right, I wish it would've cost that little. Unfortunately it was caught too late. The belt shredded into the engine while driving, causing engine failure on the road. Wouldn't go into drive, let alone get into 1st. Had to push it into a parking lot and tow it to BMW. It was awful.

Ended up having to take the engine apart to clean it all up. Luckily I was under CPO warranty.
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      03-22-2017, 10:34 PM   #16
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Ouch. Really sorry to hear that. At least the CPO covered it. Out of pocket on that would be a nightmare.

The E9X seems to have a very nasty habit of shredding the belt and sucking it into the engine when it wears out completely. I've never seen so many cases of it compared to other earlier BMWs.
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      03-23-2017, 12:07 AM   #17
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Wow thanks for giving me the heads up on that! I'm definitely not driving it till I get it repaired!
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      03-23-2017, 12:18 AM   #18
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Quote:
Originally Posted by Welcome to NBA Jam View Post
I did all of mine at once, mainly because one of the pulleys in the tensioner was wobbling and they're not separately replaceable (well...technically you could, but there's a lot of effort and unknowns). Here are the parts you'll need:

Tensioner assembly: 11287582946
75mm idler pulley: 11287578674
90mm idler pulley: 11287578675
Drive belt: 11287628650

With tensioner: $180.38
Without tensioner: $87.78

And, some time this year, you'll be able to upgrade your power steering pulley from plastic to aluminum courtesy of Hamburg-Technic! That part number is 32427582947.
Where did you get these prices? If so please let me know, I would like to order a set also.
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      03-23-2017, 07:41 AM   #19
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i have the same exact noise and issue. ordered the ecs kit for 165. looks like the price went up a bit

https://www.ecstuning.com/b-assemble...1287582946kt2/
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      03-23-2017, 09:20 AM   #20
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Where did you get these prices? If so please let me know, I would like to order a set also.
OEMBimmerParts.com

Looks like the price went up for the tensioner since the last time I bought it, so the total cost of everything would be $196.78. It appears that the ECSTuning kit posted above is the cheapest right now.
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      08-17-2017, 02:36 PM   #21
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Found this post and I need some advice. I purchased my '11 335i about 2 months ago and have been fighting the belt squealing most of my ownership. Below is what I have done or experienced in order.

Noticed squealing
Belt Replaced - squealing stopped
Few weeks later - starting squealing again
Replaced both deflection pullys and belt tensionor - squealing continued
Completed water test and squealing paused
Belt Replaced - squealing stopped
Few weeks later - squealing started again
Identified coolant leak and replaced vent line (coolant leaked over belts; cleaned engine bay)

Squealing still continues as I start the car. It's not as loud as or as constant as it was before the tensionor, belt and pulleys were replaced. I've tried turning off the AC and the squealing persists.

What next?
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      08-17-2017, 02:58 PM   #22
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Check Power Steering Levels!
I 'think' I am having the same issue as you and was told that could be a cause.



Quote:
Originally Posted by bjt135psu View Post
Found this post and I need some advice. I purchased my '11 335i about 2 months ago and have been fighting the belt squealing most of my ownership. Below is what I have done or experienced in order.

Noticed squealing
Belt Replaced - squealing stopped
Few weeks later - starting squealing again
Replaced both deflection pullys and belt tensionor - squealing continued
Completed water test and squealing paused
Belt Replaced - squealing stopped
Few weeks later - squealing started again
Identified coolant leak and replaced vent line (coolant leaked over belts; cleaned engine bay)

Squealing still continues as I start the car. It's not as loud as or as constant as it was before the tensionor, belt and pulleys were replaced. I've tried turning off the AC and the squealing persists.

What next?
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