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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 06-06-2010, 03:03 AM   #1
dh0licious
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Leaking diff, what do I need?

Hi all,

I noticed an oil leak on my garage floor where my diff is, so I drove the car back in and it aligns pretty well with where the diff is. Obviously it's leaking, so I am wondering what I will need to do the change and prevent the leak.

It'd hard searching with my iPhone so if you could point me in the direction of a DIY that would be great. I've already got a bottle of redline diff fluid, but what additional bolts, washers etc will I need? Part no's would be great.


I plan to have my Indy take care of this tomorrow/Tuesday but is there any chance of major damage?

Regards, Sameer
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Old 06-06-2010, 03:39 AM   #2
Greek Dinan
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You need to know whether its a shaft seal or just the cover leaking. Not sure on part no.s for the seals, but if its just the diff cover, then all you need is a sealer. I think RTV will work just fine. BMW discontinued the diff cover gaskets.
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Old 06-06-2010, 12:17 PM   #3
lkstaack
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Quote:
Originally Posted by Greek Dinan View Post
You need to know whether its a shaft seal or just the cover leaking. Not sure on part no.s for the seals, but if its just the diff cover, then all you need is a sealer. I think RTV will work just fine. BMW discontinued the diff cover gaskets.
Yes, it could be the input or one of the two output shaft seals, the cover, or the drain plug washer. I recommend that you clean the diff and then re-inspect it for leaks after driving it for a while. Replacing the drain plug washer will be the easiest leak to fix, but not necessarily the most likely.

You will have to drop the diff to replace seals; you might be able to fix a cover leak without dropping it. It is true that BMW no longer uses cover gaskets, but RTV is not a long term solution. RTV will not hold up to sustained contact with oil over time. There is a hard to find Loctite product designed for this application; BMW sells it (about $50 a tube), but it is also available online.
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