Automatic Transmission Oil Leak

oceanview · 07-09-2018, 02:54 PM

Gents

While installing DV+, FMIC and Charge Pipe a few days ago, I recognized that some oil is leaking in the torque converter housing.
I'm pretty sure it is transmission oil not engine oil (by the smell and because I did not have to refill engine oil since the last oil change a few thousend miles ago).

It was quite juicy around the rubber cap under the housing.
It looks to me, like it could be a problem with the front o-rings of the transmission (V or Y on this pic).
https://www.realoem.com/bmw/enUS/sho...diagId=24_1143

Is there any way to check the transmission oil level by board computer or physically? I assume on the above link screw plug "3" could be the refill and oil level plug? Am I right?

Car has 55'000 Kilometer / 34'000 miles on. Is this a known problem?
Just would like to know better before heading to the dealer.

Thanks

Orion4 · 07-09-2018, 04:27 PM

I believe the only way to check the level is the "finger method". Yup! #3 is the winner!

Polo08816 · 07-10-2018, 05:16 AM

Quote:

Originally Posted by oceanview

Gents

While installing DV+, FMIC and Charge Pipe a few days ago, I recognized that some oil is leaking in the torque converter housing.
I'm pretty sure it is transmission oil not engine oil (by the smell and because I did not have to refill engine oil since the last oil change a few thousend miles ago).

It was quite juicy around the rubber cap under the housing.
It looks to me, like it could be a problem with the front o-rings of the transmission (V or Y on this pic).
https://www.realoem.com/bmw/enUS/sho...diagId=24_1143

Is there any way to check the transmission oil level by board computer or physically? I assume on the above link screw plug "3" could be the refill and oil level plug? Am I right?

Car has 55'000 Kilometer / 34'000 miles on. Is this a known problem?
Just would like to know better before heading to the dealer.

Thanks

Quote:

Originally Posted by Orion4

I believe the only way to check the level is the "finger method". Yup! #3 is the winner!

The downside is that it is a fairly involved method on how to check the transmission oil level - very temperature specific.

sspade · 07-10-2018, 07:00 AM

I had a similar issue and it ended up being the transmission cooler lines leaking at the fittings. Fixed under warranty.

07-09-2018, 02:54 PM	#1
oceanview Captain 207 Rep 603 Posts Drives: 335i F31 RWD Autom. Join Date: May 2013 Location: Switzerland iTrader: (0)	Automatic Transmission Oil Leak Gents While installing DV+, FMIC and Charge Pipe a few days ago, I recognized that some oil is leaking in the torque converter housing. I'm pretty sure it is transmission oil not engine oil (by the smell and because I did not have to refill engine oil since the last oil change a few thousend miles ago). It was quite juicy around the rubber cap under the housing. It looks to me, like it could be a problem with the front o-rings of the transmission (V or Y on this pic). https://www.realoem.com/bmw/enUS/sho...diagId=24_1143 Is there any way to check the transmission oil level by board computer or physically? I assume on the above link screw plug "3" could be the refill and oil level plug? Am I right? Car has 55'000 Kilometer / 34'000 miles on. Is this a known problem? Just would like to know better before heading to the dealer. Thanks __________________ 335i F31 RWD in SB \|\| Powertrain: Active Autowerke Flash Tune Stage 1 \| AA Charge Pipe \| AA FMIC \| GFB DV+ \| xHD Trans-Flash \| Quaife LSD \| Cyba 3.5" Carbon tips \|\| Chassis: 20" 405M \| Wiechers Strut Bar \| Rear M-Diffusor \|\| Brakes: 18" M-Perf Brake orange 370/345 \| EBC YellowStuff pads all around \|\| Various: LED bulbs: Fog-L. front \| Turn Signal f&r \| Brake L. \| Reverse L. \| Rear L. \| Rear Fog L.
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07-09-2018, 04:27 PM	#2
Orion4 Lieutenant Colonel 481 Rep 1,572 Posts Drives: 2013 335i Sport Line Sedan Join Date: Aug 2009 Location: Melbourne, FL iTrader: (0)	I believe the only way to check the level is the "finger method". Yup! #3 is the winner!
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07-10-2018, 07:00 AM	#4
sspade Major General 2466 Rep 5,457 Posts Drives: F30 Join Date: Oct 2017 Location: Stevenson, WA iTrader: (3) Garage List 2016 BMW 320i [7.87] 2014 BMW 328i [6.83]	I had a similar issue and it ended up being the transmission cooler lines leaking at the fittings. Fixed under warranty.
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