DCT trans leak

image Ok DCT oil pan on a 2013 335i,,,,major trans fluid leak,,,,the trans was starting to shift a little funny.image You can seethe oil pan is covered with trans fluid,,,,and the black seal just above that is the mechtronic valve body seal.image Here the whole trans removed from the car,,,,,see that side cover,,,,that is the cover for the mechtronic valve body.image Here the mechtronic valve body plug connector,,,,noticed the puddle of oil on the right side,,,,that is the main trans fluid leak,,,,it’s coming out the plug connector and running down the side of the transmission.image Here the plug connector pulled out of the transmission,,,,you can see the new black seal in the middle of the connector,,,,,the original seal is orange in color.image Here a picture of the bell housing of the transmission,,,,behind that cover is the clutches for the transmission,,,,so it’s easy to remove the transmission,,,,you don’t have to worry about the pressure plate and clutch disc hanging of the flywheel.

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12 Responses to DCT trans leak

  1. a.a. says:

    Wow. That mechatronic sleeve has been a problem on a lot of vehicles…Many miles on this vehicle?

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    • Yea there has been a problem with the mechtronics sleeve on several cars,,,,,this car only had 36k miles,,,,the weird thing is the mechtronics sleeve is on top of the trans,,,,it just shows you there is trans fluid everywhere inside the trans.

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  2. I have this leak on my N63 550ix. I’m going to swap out the plate and replace the fluid myself. ISTA+ says that the car has to be elevated and the parking brake on. However, the only way I can elevate my car is with wood blocks under the wheels, because I use a jack on the jackstands. Can I do the oil balancing with the wheels not turning? Or can I do a partial fill, lower the car, drive around to get the oil up to temperature and run through all the gears, and then come back and raise the car again to do the final oil balancing?

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    • You can do it all with the car in the air and the wheels not touching,,,,,just top off the trans fluid,,,,then perform the oil balancing,,,,it’s all about the temp

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      • What if the wheels are still supporting the car? Would that be bad? Can I run through all the requisite gears with the parking brake still on?

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      • I haven’t run though that test in awhile,,,,but I believe you don’t run though the gears,,,,it’s just a temperature thing,,,,you top off the trans fluid,,,then you start the engine and let it idle until it gets to a certain temperature then you add more trans fluid until it is topped off and you are done.

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  3. Misko says:

    Hi Andreas. Is this same Transmission like one used in 2009 bmw z4 35i dct ? Long story short. I bought used bmw z4 35i with DCT recently. Unfortunately I found out that trans cover was wet possibly from leak. Car went on ramp , took off cover and I can see lower oil pan coveret with oil mixed with dirt… also vertical black seal for mechatronic valve cover is oily on around bottom side. As I just find out from your post .. the reason for my leaking could be also mechatronic body plug ?
    So far i tought it could be either lower oil pan and lower seal or side seal and side cover (mechatronic valve cover)
    Is it correct thatto replace side one seal or cover , tranny has to be lowered ?
    Does same apply to mechatronic connector?
    My car is out of warranty as it is 2009 model and mileage is 40 000, I can imagine catastrophic expensive fixing of this problem and to be honest I am in panic mode because of that. I am not sure for how long tranny was leaking and how much is leaking but it is very smooth and operate as normal.

    Best regards

    Misko

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    • Ok,,,your problem is that mechtronic body sleeve on top of the transmission,,,yes you have to remove the transmission to replace the mechtronic side cover anyway,,,,so the best thing to do is replace all 3 at the same time,,,replace the lower oil pan with the seal the side mechtronic cover seal and the top mechtronic body sleeve seal,,,and the top off the trans fluid,,,,and you will be good for along time

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      • Misko says:

        Thank you for your answer Andreas. I am doing everything as you said. Ordered bottom pan with seal and screws, side gasket and screws, o ring and also filter for lower pan. There is slight problem. This is part number for dct fluid ‘83222446673’ which is not available anywhere in UK right now until half of June. Is there any other fluid that can be used Andreas? I can send you details of my car VIN and reg number privately if its help. (Maybe m3 dct fluid??)

        Regards

        Misko

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      • Can you talk to the dealer,,,,maybe there is a updated fluid and part number.

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  4. Misko says:

    And quick update. I managed to squeeze under car and took picture. On green sticker its says LIFETIME FILL BMW NO 83 22 – 0 440 214 which is again different part number then 83 22 – 2 446 673 from ‘realoem’ website for my car.

    Regards

    Misko

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