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03-01-2015, 06:31 AM | #1 |
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DCT Leak Recurring Problem?
Unfortunately I found my DCT (32K miles) seeping fluid out through the mechatronics seal and possibly also the lower pan. It seems to be a relatively frequent issue with many cars and in many instances, is covered under warranty. What I have not been able to find much information on is whether this issue reoccurs on cars that have had the seals replaced once already.
Does anyone know if the seeping is caused by seal failure, loosening bolts, or some other cause? I have a hard time believing that the seals go bad so quickly and am thinking it may be attributable to the bolts working themselves loose over time, such that a periodic re-torque would prevent it in the future. I know that some believe that the lower DCT pan warps because it is plastic but the mechatronics cover is metal and would not seem prone to warping. Lastly, has anyone tried to simply re-torque the bolts after discovering a leak and have good results? |
03-01-2015, 06:43 AM | #2 |
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It's a complete kit with seals , pan , bolts ,and of course the Pentosin , ect...
About re-torque the bolts I've never saw or heard of it was done .
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03-01-2015, 09:19 AM | #3 |
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I just can't believe that the seals on the mechatronics cover go bad so quickly. Upon inspection, the seal looks good, is pliable, and has no evidence of rot. The only way I could see the oil seeping out is if the bolts worked themselves loose over time. I don't want to have the transmission taken out to fix the seal only to be right back in the same situation 3 years from now.
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03-01-2015, 10:13 AM | #4 | |
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There is no need to pull the transmission for replacing the kit . I'm also curious about re-torque the bolts.... And I had changed my Pentosin at 30K as precaution ,but there was no difference in feel shift from before and after .
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03-01-2015, 10:26 AM | #5 |
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As just coming out from a DCT fix (..+ a bit..), I learned that the box also can leak from the top, assumingly where the oil cooling pipes are attached. Don't know whether needed to fix the mechatronic side but for the top leak the box obviously have to come down. Goes from simple fix to quite major job so yes get it done while under warranty.
Good luck! Ps. Min was at 20k miles. Will keep an eye but hope it wont come back. |
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03-01-2015, 10:57 AM | #6 | |
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I looked at the mechatronics cover and it's pretty tight in there; not sure if a tech can get a wrench in there to take the cover off and replace the seal. I'll take the car into the dealer within the next week or so. |
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03-01-2015, 11:56 AM | #8 |
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I dabbed a little on a paper towel and it was clear. The color seems more like diff fluid than engine oil. It has the same translucency as hiney but is not quite ao golden and more towards the grey spectrum.
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03-01-2015, 12:17 PM | #9 | |
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03-01-2015, 07:08 PM | #10 |
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I checked the source and it is definitely the mechatronics cove. There is no evidence of fluid coming from the top of the transmission, which I am glad for. This is pretty annoying but at least I should get a DCT fluid change under warranty (I wa planning to do it at the end of the year at my expense).
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03-10-2015, 05:52 PM | #11 |
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Took the car into the dealer and got it back today. I was told that the leak/seeping is not bad enough to warrant a repair. As the transmission housing goes through heating cooling cycles, it may allow fluid to come out. I understand the dealer's hands being tied by the repair BMW NA will authorize under warranty. So my gripe at this point is with BMW. Does anyone else think that for a high-end car, this resolution is not acceptable? It's just amazing that it is leaking/seeping but for BMW just not badly enough. I would also like to hear from any folks who do think BMW not wanting to fix the seal is acceptable.
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03-10-2015, 06:01 PM | #12 | |
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BTW....No matter what kind of leak...A leak is a leak , end of story ! Never saw a normal leak !
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03-10-2015, 06:42 PM | #13 |
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does the leak every show on the pavement when parked or is there some plastic cover that it leaks on to? asking cuz mine never leaves and smudges when parked but maybe i need to jack it up and actually check for real
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03-10-2015, 06:50 PM | #14 |
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I just got my car back from the dealer. The vertical pan and gasket were replaced under warranty. In case this is helpful:
The parts are 1 and 2, part # 28607842855 and 28607842856. According to the SA, they have a special tool to service the side cover. They just had to partially dismount the transmission to get it to rotate. |
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03-10-2015, 08:40 PM | #15 | |||
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03-11-2015, 05:09 AM | #16 |
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Hi Rantar,
I wouldn't give in, it's a leak which they obviously should cover. The argument "small leaks are fine, BMW designed that in" is simply wrong. And what says it doesn't increase ending up with a more costly project, obviously shorty after your warranty has ended up... Go get'em mate! |
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03-11-2015, 07:26 AM | #17 |
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I had a seepage issue last summer. They also replaced the pan and gasket. I was switching my exhaust a couple weeks back and low and behold if its not leaking/seeping again. I didnt look to see where the oil was coming from, but the transmission case had an oily residue and there was a lingering drip. Also, the felt cover showed signs of there being a leak.
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03-11-2015, 10:29 AM | #18 | |
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03-11-2015, 12:55 PM | #19 |
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I recently found out also my dct is leaking too. I suspect that mine is leaking from the rubber gasket on the side of the mechatronics and oiling down to the pan on the bottom. Leak isn't super bad since I didn't see any oil residue on the plastic cover but I am thinking to take it to the dealership to fix it before my warranty expires.
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03-11-2015, 02:40 PM | #20 | |||
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They did not list new bolts in your work order? My SA told me the bolts were stretch one-time use bolts and that re-torquing could not be done. I had requested that they at least re-torque everything as the seeping could be due to loosening bolts. I think it is quite amazing that something as simple as a transmission seal is problematic on these cars. With my MPE going bad (although replaced under warranty), a bad belt tensioner, and a leaky transmission in 30K, this is probably my last BMW. I put up with it on this car because it's just such an exhilarating car to drive. I wonder if there are any aftermarket alternatives to fix this problem, such as better gaskets or covers that don't warp (if that's the cause). Quote:
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03-11-2015, 03:14 PM | #21 | |
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03-11-2015, 03:20 PM | #22 | ||
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