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      10-06-2014, 09:39 PM   #1
testdriver
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LSD / Differential oil leak....

I found oil is leaking from my LSD, is anyone having this problem before? What is the necessary parts and method to fix it?

Car info: 2008 M3 6spd manual. 58,000 KM.

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      10-06-2014, 10:42 PM   #2
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The driveshaft seal and dust cover needs to be replaced (#6,7). While you're in there check the condition of the other hardware and replace as necessary.

http://realoem.com/bmw/showparts.do?...18&hg=33&fg=05

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      10-06-2014, 10:57 PM   #3
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Thanks for the diagram.

~both left & right side is clean & normal.... just the "front" is leaking.
I just wondering how difficult / costly is this repair job cuz my car is out of warranty.

Thanks again !
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      10-07-2014, 06:52 AM   #4
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I think BMW repair procedure "RA 33 01 021" covers this but I do not have a copy. Maybe someone with a TIS subscription will link a pdf. It can be as simple as marking the nut on the flange, impacting the nut off, pulling the flange, replacing the seal and dust cover and reinstalling. The tricky part is that if you reinstall the flange with any more or less torque than it had before, it could affect the bearing inside the diff. The technically correct method is to go much further and disassemble the diff and replace the crush sleeve inside the diff that helps set that torque, but this method is much more involved.
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      10-07-2014, 03:18 PM   #5
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Thanks for the great info.... I will try to search for that repair procedure.
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      10-07-2014, 03:47 PM   #6
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The repair procedure is referenced in Technical Service Bulletin SI B33 04 08, but you will not find the repair procedure there. You can find it free online in a bmw workshop manual site if you can navigate your way around the site.
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      10-13-2014, 10:50 PM   #7
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OP, i have the same problem. Did you get any more info about it?
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      11-18-2014, 10:01 PM   #8
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Quote:
Originally Posted by Groundpilot View Post
OP, i have the same problem. Did you get any more info about it?
At first, my shop believe the leak has something to do with overfill lsd fluids, after we change it and fill with correct amount the leak seems less (but still has small leak).

I just order all the repair parts..... now I hv to search for the repair procedure and related TSB/ TIS.

I will update the process here.....
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