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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Serpentine belt broke today at 80mph...



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      04-25-2013, 06:10 PM   #1
sovende96
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Serpentine belt broke today at 80mph...

Well, there goes my serpentine belt... At 75pm est around a turn, all of a sudden my power steering cuts out and the charging malfunction turns on... Luckily the wheel is not terribly hard to spin at high speeds without ps but defiantly gave me a scare ... Drove the car slightly down the road to my school parking lot and left it there today to stay overnight.

It looks like its just the serpentine belt that was ripped due to high mileage, no damaged pulleys/tensioners/oil leaks... Ordered the belt from bmw and should be here by 7:30 tomorrow morning. Also need to pick up a t60 torx I believe for the tensioner.

Anyone here diy that has any suggestions? Doesn't look like a difficult job compared to other diy Ive done. Will also be getting a few helping hands.

Thanks!

A

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      04-25-2013, 06:23 PM   #2
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How many miles?
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      04-25-2013, 06:42 PM   #3
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Originally Posted by Fun w/N54 View Post
How many miles?
Has 103k...
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      04-25-2013, 06:52 PM   #4
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Originally Posted by sovende96 View Post
Has 103k...
phew- i've got a little time to do this- please post a diy if you can!
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      04-25-2013, 06:55 PM   #5
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man this sucks, i am at the mileage too. Mine looks ok as I often do a visual inspection on my car. I should start looking into this replacement. I wonder how hard is it to change? I will look for a DIY here...
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      04-25-2013, 06:56 PM   #6
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phew- i've got a little time to do this- please post a diy if you can!
yeah, there is defiantly a lacking of the diy for the n54 online! I will try to take some pictures a do a quick write up afterwards... I am unfortunately doing it in my school parking lot as I don't want to drive it home with a broken belt!


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Originally Posted by GoRomeo View Post
man this sucks, i am at the mileage too. Mine looks ok as I often do a visual inspection on my car. I should start looking into this replacement. I wonder how hard is it to change? I will look for a DIY here...

It doesn't seem to difficult of a job... Ive done a engine belt on an e46 before... Involved removing the air duct, then loosening the tensioner and sliding the belt off... In my case, the belt is already off and kinda stuck in one spot :/...
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Last edited by sovende96; 04-25-2013 at 08:08 PM.
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      04-25-2013, 06:58 PM   #7
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my e46 m3 was easy to change, never did an e9x though but I can't imagine it being too hard
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      04-25-2013, 07:06 PM   #8
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Make sure you have a breaker bar or large ratchet with that torx for the tensioner, it is a strong spring on it.
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      04-25-2013, 07:13 PM   #9
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^ +1 will make it easier. It shouldn't be hard to put it on. Is your car AT or MT pretty sure if its an automatic it'll be a bit of a pain removing the engine fan and shroud for space..
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      04-25-2013, 07:30 PM   #10
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Quote:
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phew- i've got a little time to do this- please post a diy if you can!
I wouldn't wait too long, mine went at 40k miles!
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      04-25-2013, 07:33 PM   #11
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Quote:
Originally Posted by KwlAznKid View Post
my e46 m3 was easy to change, never did an e9x though but I can't imagine it being too hard
K cool. Yeah I've done one on an e46 with 111k with a buddy and it was relatively easy which is why Im not terribly hesitant to do it on the n54.

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Originally Posted by deadmn1337 View Post
Make sure you have a breaker bar or large ratchet with that torx for the tensioner, it is a strong spring on it.
Ok tnks... Ill bring a torque wrench to the parking lot when it is, but if it doesn't fit, I will use a breaker bar.

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Originally Posted by iBoost View Post
^ +1 will make it easier. It shouldn't be hard to put it on. Is your car AT or MT pretty sure if its an automatic it'll be a bit of a pain removing the engine fan and shroud for space..
It is a 6 speed mt which is a plus Ive heard aswell for this diy...
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      04-25-2013, 07:34 PM   #12
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Glad you recovered quickly..post DIY
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      04-25-2013, 07:38 PM   #13
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Check this thread for some info. It is for E90 n52 though. Shouldnt be far off.
http://www.e90post.com/forums/showthread.php?t=627158
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      04-25-2013, 08:02 PM   #14
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Quote:
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Glad you recovered quickly..post DIY
Me too! And I will try.

A


Quote:
Originally Posted by PichaDis11 View Post
Check this thread for some info. It is for E90 n52 though. Shouldnt be far off.
http://www.e90post.com/forums/showthread.php?t=627158
Yes, saw that thanks. I will be going off part of that diy for the tensioner part of it. Will post if anything is different on the n54...

A
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      04-25-2013, 09:08 PM   #15
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Man thats terrible! I was wondering what you and your friend were doing at the end of the parking lot when I was leaving. Hopefully everything works out for you.
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      04-25-2013, 09:32 PM   #16
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Quote:
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Man thats terrible! I was wondering what you and your friend were doing at the end of the parking lot when I was leaving. Hopefully everything works out for you.
ty Leland... Yeah, its unfortunate, but not too bad... It is excepted for the s belt to break at my mileage. I just wish it didn't cut loose at 80mph... Scary when your power steering cuts out when turning at that speed on stanwich with oncoming cars...
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      04-25-2013, 09:38 PM   #17
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When are these suppose to be replaced?
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      04-25-2013, 09:42 PM   #18
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Quote:
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When are these suppose to be replaced?
From what I've been told is some last as low as 40k and some can hold up until 100 like mine... Typically, a serpentine belt should last between 90-150k...
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      04-25-2013, 09:48 PM   #19
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The first thing I must say is, I checked your car year, and it is a 2007. That brings me to my next point.

The 2007/ early 2008 had a subframe problem. When the motor is running, at certain times, it can and will move hitting the subframe or something. This can break the pulley or shred the belt.

There are a lot of high mileage 335i's without incident of the belt breaking like this unless it is the 07 model which has the subframe problem.

Even then, what may have happened is that this contact was made a long time ago and did damage the belt. Over time, the belt just wore down and got worse. Then it finally snapped.


I find it quite hard to believe based on your picture that the belt was perfect 1 minute, the next minute, it just snapped like that. Especially, when you look at the way it started to tear vertically.
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      04-25-2013, 09:52 PM   #20
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Quote:
Originally Posted by sovende96 View Post
From what I've been told is some last as low as 40k and some can hold up until 100 like mine... Typically, a serpentine belt should last between 90-150k...
Do you just let them go until they snap?
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      04-25-2013, 09:53 PM   #21
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Quote:
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The first thing I must say is, I checked your car year, and it is a 2007. That brings me to my next point.

The 2007/ early 2008 had a subframe problem. When the motor is running, at certain times, it can and will move hitting the subframe or something. This can break the pulley or shred the belt.

There are a lot of high mileage 335i's without incident of the belt breaking like this unless it is the 07 model which has the subframe problem.

Even then, what may have happened is that this contact was made a long time ago and did damage the belt. Over time, the belt just wore down and got worse. Then it finally snapped.


I find it quite hard to believe based on your picture that the belt was perfect 1 minute, the next minute, it just snapped like that. Especially, when you look at the way it started to tear vertically.
Ill look further at the pulley system/where the belt snapped in the morning. All the pulleys looked fine today and did not hear any funny noises after the belt snapped. Hopefully it is not as you say, and there is no subframe damage...


Quote:
Originally Posted by Mr.Ritz View Post
Do you just let them go until they snap?
You should be able to tell if your belt shows signs of wear. Based on your current mileage, it depends whether or not you want to replace the belt.
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      04-25-2013, 10:13 PM   #22
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My one was noisy at 32000km. I changed mine all by myself. One of the easiest jobs on any car. See the youtube video I made below. 2010 320d



hope this will help you.
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