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      04-25-2008, 09:23 PM   #1
GregW / Oregon
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Diff noise?

I'm getting a low noise on tight low speed turns. Might be the diff. I noticed on the 1,200 service there was not additive listed for the diff oil. I thought all the MLocks got it. The parts guy said only if they're "noisy".

The noise is hard to describe, but like a low rubbing sound, on both left and right hard turns. You can really hear it in a parking garage with the window down.

Anyone?
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      04-25-2008, 09:29 PM   #2
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Haven't heard that yet. Although, I hear many noises in the tranny while driving/shifting. Manual states this is normal because of the way it's connected.
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      04-26-2008, 07:13 AM   #3
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I just had my 1200 service done. I didn't get a chance to drive it for long afterwards. Will look out for this in a controlled situation, but I haven't heard it until now. I do get some kind of a "whine" at around 40 mph from the drivetrain (driving straight), but I don't know where it's coming from exactly. I will check to see if it is still there after the break-in. The service guy is saying M drivetrains make all sorts of noises, and that I should drive it for at least another 1000 miles and then see.

Greg, did you go up to the redline after the break-in? If do, how is it? I'll do that today.
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      04-26-2008, 09:27 AM   #4
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Quote:
Originally Posted by lucid View Post
I just had my 1200 service done. I didn't get a chance to drive it for long afterwards. Will look out for this in a controlled situation, but I haven't heard it until now. I do get some kind of a "whine" at around 40 mph from the drivetrain (driving straight), but I don't know where it's coming from exactly. I will check to see if it is still there after the break-in. The service guy is saying M drivetrains make all sorts of noises, and that I should drive it for at least another 1000 miles and then see.
Look on your itemized invoice and see if they list an additive or conditioner, in addition to the diff fluid, please.

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Greg, did you go up to the redline after the break-in? If do, how is it? I'll do that today.
No, been commuting this week. Will have some fun with it this weekend.
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      04-26-2008, 04:01 PM   #5
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How loud was it? I've experienced a similar sound but it was quite loud - but also I would say a metal rubbing type of sound. It's only happened say three times pulling out a hard left from stand still. Not sure if this is what you're talking about though.
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      04-26-2008, 06:13 PM   #6
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Originally Posted by nechronics View Post
How loud was it? I've experienced a similar sound but it was quite loud - but also I would say a metal rubbing type of sound. It's only happened say three times pulling out a hard left from stand still. Not sure if this is what you're talking about though.
Not very loud at all. Only happens on very turns.
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      04-26-2008, 10:26 PM   #7
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I get the same thing on my E46, had the differential oil changed once or twice, it's still there.
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      04-26-2008, 11:35 PM   #8
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Quote:
Originally Posted by GregW / Oregon View Post
Look on your itemized invoice and see if they list an additive or conditioner, in addition to the diff fluid, please.
I looked. The line item is "Diff. Oil Add 15".
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      04-27-2008, 08:57 AM   #9
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Quote:
Originally Posted by GregW / Oregon View Post
I'm getting a low noise on tight low speed turns. Might be the diff. I noticed on the 1,200 service there was not additive listed for the diff oil. I thought all the MLocks got it. The parts guy said only if they're "noisy".

The noise is hard to describe, but like a low rubbing sound, on both left and right hard turns. You can really hear it in a parking garage with the window down.

Anyone?
can you elaborate on when you get it? i get noise at low speeds when i turn steering wheel. the noise is kinda similar to what you tried to describe. let me know im interested to know more please
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      04-27-2008, 09:42 AM   #10
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Originally Posted by ///Mantis View Post
can you elaborate on when you get it? i get noise at low speeds when i turn steering wheel. the noise is kinda similar to what you tried to describe. let me know im interested to know more please
It's kind of a groaning or rubbing noise on sharp corners. Circling through a parking garage you can really hear it because of the reflectivity of the structure. Happens both turning directions. I don't think it was there when I first got the car.
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      04-27-2008, 11:18 AM   #11
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Quote:
Originally Posted by GregW / Oregon View Post
It's kind of a groaning or rubbing noise on sharp corners. Circling through a parking garage you can really hear it because of the reflectivity of the structure. Happens both turning directions. I don't think it was there when I first got the car.
i noticed it once first day, then a couple of times during the 1200, then again the day i got car back from service. it's not consistent, i dont hear it all the time. heard it like 4 times so far.

i think we're talking about the same thing
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      04-28-2008, 12:53 PM   #12
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i heard this this morning.. a few times. any updates? u gonna take it in for that?
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      04-28-2008, 01:23 PM   #13
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Diff noise

Quote:
Originally Posted by ///Mantis View Post
i heard this this morning.. a few times. any updates? u gonna take it in for that?
My SA says he is positive the right fluid was used, and it now comes with the LSD additive in it. He said there is not reason for concern, that it's just the clutches working, but the can put more additive in if it's bothersome. I think I'll wait until next time I have it in for something else, unless it gets worse.
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      04-28-2008, 01:46 PM   #14
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Quote:
Originally Posted by GregW / Oregon View Post
My SA says he is positive the right fluid was used, and it now comes with the LSD additive in it. He said there is not reason for concern, that it's just the clutches working, but the can put more additive in if it's bothersome. I think I'll wait until next time I have it in for something else, unless it gets worse.
yah coz i heard that on factory oil. he's probably right about lsd differential clutches noises... i hear the same noise in after market lsd's too....
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      04-28-2008, 03:30 PM   #15
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Originally Posted by ///Mantis View Post
yah coz i heard that on factory oil. he's probably right about lsd differential clutches noises... i hear the same noise in after market lsd's too....
My E46 diff never made these noises, but I heard about a lot that did.
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      04-28-2008, 07:29 PM   #16
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differential usually needs 3500 to break in... after market ones do anyway
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      05-25-2008, 06:21 AM   #17
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Same noise

Quote:
Originally Posted by GregW / Oregon View Post
I'm getting a low noise on tight low speed turns. Might be the diff. I noticed on the 1,200 service there was not additive listed for the diff oil. I thought all the MLocks got it. The parts guy said only if they're "noisy".

The noise is hard to describe, but like a low rubbing sound, on both left and right hard turns. You can really hear it in a parking garage with the window down.

Anyone?
Hey, I have the same noise sometimes, and at first I noticed it after pulling hard, downshifting before a turn. I figured it was the diff still being locked. Then I realized it's not only after pulling hard, so that wouldn't make sense. I took it in and I wasn't able to recreate that when the tech was in the car. I thought it was when the wheel was locked left, but it's when the steering wheel is 80 or 90 degrees left.

I did have the diff oil changed. I have 6500km on the car, first heard it around 2500km.
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      05-25-2008, 10:51 AM   #18
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Originally Posted by argonboy View Post
Hey, I have the same noise sometimes, and at first I noticed it after pulling hard, downshifting before a turn. I figured it was the diff still being locked. Then I realized it's not only after pulling hard, so that wouldn't make sense. I took it in and I wasn't able to recreate that when the tech was in the car. I thought it was when the wheel was locked left, but it's when the steering wheel is 80 or 90 degrees left.

I did have the diff oil changed. I have 6500km on the car, first heard it around 2500km.
Mine is only noticeable at low speeds; occurs when driving slowly, not hard.
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      05-25-2008, 03:58 PM   #19
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after putting new oil in it i would drive it in a tight circle about 10-15 times each way
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      05-25-2008, 08:50 PM   #20
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Quote:
Originally Posted by GregW / Oregon View Post
I'm getting a low noise on tight low speed turns. Might be the diff. I noticed on the 1,200 service there was not additive listed for the diff oil. I thought all the MLocks got it. The parts guy said only if they're "noisy".

The noise is hard to describe, but like a low rubbing sound, on both left and right hard turns. You can really hear it in a parking garage with the window down.

Anyone?
Let me clear this... what do you usually do when sudden turning? stepping the clutch pedal then turn your steering wheel? i think the diff has nothing to do with the unusuall sound.. commonly the problems with the sounds when turning are the bushing(a rubber elements that keeps to do metal to metal contact that usually do unusuall sounds from the suspension system) and other suspension components..

check your stabilizer link bushing if it is already worned-out.. or maybe the thing to do is go to the service center and tell them to check your suspension system in front or your steering components ( control arms , stabilizer links , ball joints)

and also tell them that you primally suspected your balljoints and bushing...
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      06-18-2008, 08:56 PM   #21
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A grinding noise may be heard coming from the differential during slow cornering.

This noise is best heard during tight cornering situations; for example, while parallel parking, driving in a tight circle, etc


cause

When the rear wheel speed differential varies during tight cornering, a slip stick effect is created on the lining and steel discs incorporated in the differential locking clutch, causing the grinding noise.

This noise typically goes away as the locking clutch discs in the differential are broken in.

The break-in time varies depending on driving habits; for example, tighter cornering (working the locking clutch) means that it takes less time to break in the locking clutch discs.

IF THE TECH CAN VERIFY THAT THIS IS THE NOISE
differential oil should be replaced with:
83 22 2 282 583
Special differential oil kit

e46 differential = e92 differential with bigger cooling fins. there has been a small percentage of people who have had concerns on slow tight cornering such as parallel parking a groaning type sound is heard from the rear differential. Since this is a same issue known with e46 m3, e60 m5, e63/54 m6 and e90/92 m3. a 'special' differential fluid is used
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      06-19-2008, 09:05 AM   #22
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Quote:
Originally Posted by quixs1lver View Post
A grinding noise may be heard coming from the differential during slow cornering. This noise is best heard during tight cornering situations; for example, while parallel parking, driving in a tight circle, etc

cause:

When the rear wheel speed differential varies during tight cornering, a slip stick effect is created on the lining and steel discs incorporated in the differential locking clutch, causing the grinding noise.

This noise typically goes away as the locking clutch discs in the differential are broken in.

The break-in time varies depending on driving habits; for example, tighter cornering (working the locking clutch) means that it takes less time to break in the locking clutch discs.

IF THE TECH CAN VERIFY THAT THIS IS THE NOISE differential oil should be replaced with: 83 22 2 282 583 Special differential oil kit

e46 differential = e92 differential with bigger cooling fins. there has been a small percentage of people who have had concerns on slow tight cornering such as parallel parking a groaning type sound is heard from the rear differential. Since this is a same issue known with e46 m3, e60 m5, e63/54 m6 and e90/92 m3. a 'special' differential fluid is used
"In principle, the final drive is assembled in the same way as in the E6x M5/M6. It is, however, a separate new development. The bevel gear shaft bearing is a frictionoptimized, double-row, angular-contact ball bearing. The gear ratio between the bevel gear and the crown gear has been adapted to the engine speed and gearbox ratio of the M3.

The final drive ratio is 3.85:1. The 215 gear set (crown wheel diameter 215 mm) has been temperature and noise optimized. A friction-reduced gearing is used. The housing of the final drive has been adapted to accommodate the double-row angular-contact ball bearing. The flanges for the propeller and drive shafts are the same as those used on the E6x M5 and M6." BMW Aftersales Training

Thanks for the info on the diff oil. I need to take mine in, as it continues to be noisier than I like. As I said in the OP, it didn't start until the oil was changed at first service.
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