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      03-04-2016, 09:47 PM   #1
jalyousef
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Bell noise coming from differential e92 m3 2009

I have a 2009 e92 m3 coupe w/ dct and 70k miles.

This recently started happening within the last 2 weeks.

From a stop, right when I put my foot on the gas and accelerate it makes a bell noise, like metal hitting metal. Sounds like it's coming from the rear differential. It only does it instantaneously and then disappears once I start driving. Whenever I let off the gas (only at speeds of about less than 20mph) it makes this noise again. It seems like it makes this noise every time the car jerks forwards or backwards from accelerating or decelerating.
I just took it to my friend's independent shop and they had it for 3 days and the only thing they could think to do was change the differential fluid and to replace the cracked flex shaft.
I'm about to have to just resort to the dealership, but want to see if anyone has any idea of what is causing this.
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      03-04-2016, 11:53 PM   #2
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I have the same bell sound coming from the clutch. Like a "Ting".
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      03-04-2016, 11:57 PM   #3
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It's common.
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      03-04-2016, 11:59 PM   #4
Doc Oc
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Long shot here but are you guys sure you're not hearing the common cow bell noise that comes from getting a rock caught in the brake shield?
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      03-05-2016, 01:41 AM   #5
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Quote:
Originally Posted by monterey View Post
I have the same bell sound coming from the clutch. Like a "Ting".
Yep...please let me know if you find out what the issue is.

Quote:
Originally Posted by Doc Oc View Post
Long shot here but are you guys sure you're not hearing the common cow bell noise that comes from getting a rock caught in the brake shield?
No it's not that. I had that issue before and it fell out on it's own within 50 miles or so.

I did just get a differential flush with that new additive less than 100 miles ago so maybe it will go away after 500 miles or so?
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      03-05-2016, 10:30 PM   #6
jalyousef
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I tried making a video of it. Would like to see if anyone knows what this is before I go spend $200 to have the dealership just look at it.
As you can imagine, this is an EXTREMELY annoying sound. I'm borderline embarrassed to drive my car, when it should be the opposite.

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      03-05-2016, 11:29 PM   #7
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My M3 makes a similar sound.

Replaced the CV joint on the driveshaft and applied loctite to the splines on the differential input shaft and the sound is still there.

It isn't the differential, in my case it's the center U-Joint on the driveshaft. So the only fix is a new driveshaft.
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      03-07-2016, 09:36 PM   #8
jalyousef
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Can anyone else confirm that this is the u-joint/drive shaft?

I took it to the dealer today to see if the u-joint was damaged and after charging me for the one hour diagnostic labor fee of $165 they came back and told me they'll need to charge me another 4.5 hours of labor because the exhaust needs to be removed, costing in the $800-$900 range. I told them that they sell brand new drive shafts for $900 so why on earth would I spend $900 just to tell me that it needs to be replaced. The 3 times I have been there they always remind me why I never go.
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      03-08-2016, 05:41 PM   #9
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Common problem. My SA stated it was a bent brake shield. Read this

http://www.m3post.com/forums/showthr...light=cow+bell
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      03-08-2016, 05:47 PM   #10
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Quote:
Originally Posted by ivad32 View Post
Common problem. My SA stated it was a bent brake shield. Read this

http://www.m3post.com/forums/showthr...light=cow+bell
This is not the problem. If you listen to the video, you can clearly tell the sound is from the driveshaft 100%.
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      03-15-2016, 09:19 PM   #11
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Driveshaft 100%. It sounds like a hammer hitting a hollow pipe real quick, just once.
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      03-15-2016, 10:45 PM   #12
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Drive line related, drop the exhaust, pull the driveshalf. There is play somewhere in it, either the rear CV or a ujoint.
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      03-29-2016, 02:05 PM   #13
jalyousef
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Thanks everyone so much for the comments. I ended up buying a used drive shaft with low miles and had that installed by my indy shop, and now the sound is gone! The car drives much better as well
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      03-29-2016, 02:54 PM   #14
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Holy moly, THATS EXACTLY the sound I have!!!!
So a new drive shaft and I'm good, right?
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      03-29-2016, 02:56 PM   #15
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Quote:
Originally Posted by vsix View Post
Holy moly, THATS EXACTLY the sound I have!!!!
So a new drive shaft and I'm good, right?
More than likely. I'm kind of disappointed in the strength of the drivelines on these cars.

75k on mine and have already replaced the driveshaft cv joint, a rear axle and now the u-joint on the driveshaft is junk.
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      03-29-2016, 03:31 PM   #16
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Quote:
Originally Posted by doogee View Post
More than likely. I'm kind of disappointed in the strength of the drivelines on these cars.

75k on mine and have already replaced the driveshaft cv joint, a rear axle and now the u-joint on the driveshaft is junk.
85k here.
Iam also a little disappointed, thinking about the good old 03 cobra days pushing 600+ to the crank and the car had a bone stock driveline.
Oh well, thats the downside of owning an german exotic car
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      04-09-2016, 12:33 PM   #17
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Quote:
Originally Posted by doogee View Post
More than likely. I'm kind of disappointed in the strength of the drivelines on these cars.

75k on mine and have already replaced the driveshaft cv joint, a rear axle and now the u-joint on the driveshaft is junk.
Doogee I've just bought the driveshaft and will install it by the end of next week.
Wish me luck, that this is the gremlin that causes these bell noises
Will give you an headsup soon as I got it installed!
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      04-14-2016, 11:32 AM   #18
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Quote:
Originally Posted by vsix View Post
Doogee I've just bought the driveshaft and will install it by the end of next week.
Wish me luck, that this is the gremlin that causes these bell noises
Will give you an headsup soon as I got it installed!
Sure let us know!

Thanks
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      04-22-2016, 03:53 PM   #19
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Quote:
Originally Posted by doogee View Post
Sure let us know!

Thanks
There you go:
I officially confirm, these sounds do come from an worn out driveshaft.
I replaced mine uppon this thread, as I had the exact noises!
My car feels much better now accelerates much smoother and ain't got these nasty vibrations anymore!!!!!!

Doogee, man...thanx a bunch!!!!!
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      04-22-2016, 04:15 PM   #20
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Quote:
Originally Posted by vsix View Post
There you go:
I officially confirm, these sounds do come from an worn out driveshaft.
I replaced mine uppon this thread, as I had the exact noises!
My car feels much better now accelerates much smoother and ain't got these nasty vibrations anymore!!!!!!

Doogee, man...thanx a bunch!!!!!
Not a problem! Good to know, and I'm sure I'll be replacing mine soon. Seems the center u-joint wears out pretty quickly on these things.
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      04-22-2016, 04:20 PM   #21
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Quote:
Originally Posted by doogee View Post
Not a problem! Good to know, and I'm sure I'll be replacing mine soon. Seems the center u-joint wears out pretty quickly on these things.
Yeah, unfortunately!
Anyhow, we've found a great platform where we all support eachother.
Man let me tell you, how hard would an ///M ownership be, without such a great forum AND much more greater members!!!
This goes out to you and everyone on here, that helps fellow enthusiasts!
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      04-22-2016, 06:32 PM   #22
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Can anyone detail what's involved in swapping the driveshaft? Can it be diy'd?
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