Transfer case leak?

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insanesam
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Transfer case leak?

Fri Aug 30, 2019 12:48 am

Hi All

I have a 2012 BMW X6 M50D with 50000km on it. Recently noticed some oily residue on the cross member holding up the transfer case. The residue did not have any smell to it. Upon closer inspection the transfer case was bone dry (I especially checked around the shaft seals, actuator motor and fill plug). I wiped the the cross member with brake clean. A week later the residue came back and I checked the transfer case again which was bone dry. Picture attached. Anyone can explain where this residue is coming from or what it is?

Thanks,
Sam
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mr angry
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Re: Transfer case leak?

Fri Aug 30, 2019 9:20 pm

You say you checked the fill plug but did you also check the drain plug?
insanesam
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Re: Transfer case leak?

Fri Aug 30, 2019 10:05 pm

There's no drain plug on this transfer case
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Re: Transfer case leak?

Fri Aug 30, 2019 10:14 pm

This data from the BMW Tech Instr may help? Newtis is a copy of the official BMW Dealer used maintenance & repair guide.

https://www.newtis.info/tisv2/a/en/e71- ... nsfer-box/
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mr angry
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Re: Transfer case leak?

Fri Aug 30, 2019 10:22 pm

insanesam wrote:
Fri Aug 30, 2019 10:05 pm
There's no drain plug on this transfer case
Ah ok...my 2010 40d has fill and drain plugs
insanesam
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Re: Transfer case leak?

Sat Aug 31, 2019 3:24 am

Yep already went through the newtis / realoem sites to see if there was anything obvious. My transfer case is the ATC45L which only has a fill plug.
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Re: Transfer case leak?

Sat Aug 31, 2019 9:15 am

Found this ‘exploded’ drawing which might offer a clue?

http://jpat.co.uk/uploads/1/0/3/5/10354 ... atc45l.pdf

It not having any smell is a puzzle as that often means water. Odd place for it and an odd colour/consistency (which is very oil like) unless there is a drain for something nearby? Body wax that’s got hot maybe?
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marti
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Re: Transfer case leak?

Sat Aug 31, 2019 10:04 am

Looks from the pic to be oil rather than fluid?
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X5Sport
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Re: Transfer case leak?

Sat Aug 31, 2019 4:48 pm

I have a picture of the underside of the X6 and that looks to be close to the gearbox/transfer box join (assuming front is to the left?). Hard to tell because of all the covers etc BMW have installed under the X6 models.

Have you had the car in the air and the underbody shielding off?

There are also two vent pipes that come off the top of the ATC45L and seem to sit just above that area. Could it be from there?
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insanesam
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Re: Transfer case leak?

Sat Aug 31, 2019 10:51 pm

X5Sport wrote:
Sat Aug 31, 2019 4:48 pm
I have a picture of the underside of the X6 and that looks to be close to the gearbox/transfer box join (assuming front is to the left?). Hard to tell because of all the covers etc BMW have installed under the X6 models.

Have you had the car in the air and the underbody shielding off?

There are also two vent pipes that come off the top of the ATC45L and seem to sit just above that area. Could it be from there?
Thanks for the response. In my picture the left of the pic is the rear. I've had the shield rear of the TC removed and could not see anything.
However the the vent pipes sound logical as they sit just above that position. Will check again. Is it normal to have some residue coming out from vent pipes?

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