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02-08-2015, 10:06 AM | #45 | |
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02-08-2015, 02:50 PM | #46 |
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A phone call to BMW NA at my dealership's recommendation, and some discussion on the phone is what I needed to do. I was asked if I had tracked the car (I hadn't). I was just barely out of warranty, but they hooked me up even though I wasn't the original owner.
The dealership also took the time to replace all the gaskets preemptively. I didn't mind since it was not at my expense. And honestly, 2k or so including the removal of the transmission isnt that bad when you consider what it costs to replace the brakes. If they don't have to remove the transmission to replace the side and top gaskets it's far cheaper. |
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02-08-2015, 03:34 PM | #47 |
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Heres what I would recommend at this point. Drain all the fluid that is currently in the trans. Measure the amount that comes out. Depending on the year of the trans, there is an additional steel drain plug located inside the drain plug in the plastic pan. Drain this as well. Since you already have new filters etc, I would pull the plastic drain pan and replace all the filters as well. Be sure to catch all the remaining fluid from the pan when you pull it and record how much total fluid you have drained. Pull the cooler lines from the side of the trans and catch all this fluid as well and add it to the total drained. What is the total amount of fluid that you have after this?
Last edited by SJL Custom; 02-08-2015 at 03:54 PM.. |
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02-08-2015, 04:09 PM | #48 |
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Now after you have replaced the filters etc and have everything back together and are ready to fill it up, this is the easiest way to do it. The fluid capacity of the trans with cooler included is 9 liters. Take that nine liters and put all of it in the trans. Don't worry about overfilling it by a liter or whatever, it wont affect anything. The GTS actually uses the same exact trans but is overfilled by I believe 1.5 liters, so if theres ten liters in there, there wont be an issue. Now drive the car and see what happens. Make sure first to erase all previous codes and if its possible, do a oil condition reset, clutch adaptation, gearbox relearn, torque characteristic reset and teach in valve characteristics with the wheels off the ground and the car started in neutral.
If still after all of this you still have the same issues, something further is wrong and will require the trans to be removed. Side note. While you have the trans pan removed, inspect the magnet attached to the plastic pan. Make sure there are no metal filings found. A grey sludgy material is normal. You could also cut open the bottom pickup filter as well to inspect for non metallic fillings and debris. All this will lead to a proper diagnosis of the issues youre having |
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02-08-2015, 07:07 PM | #50 | |||
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02-09-2015, 04:09 AM | #53 | |
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Against dozens of MTs being swapped out for failed syncomesh, along with broken flywheel tabs and worn clutches - the number of DCTs that have seen (non dealer screw up caused) failures is extremely small. |
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02-09-2015, 04:40 AM | #54 | |
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02-09-2015, 07:26 AM | #55 |
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Tend to agree here. From 2008 onwards track record seem to show that under normal use the DCT seem close to impossible to wear out or even abuse to break. The one cause remaining is when the minimal maintenance required isn't done properly. No offense OP, the leak can be sneaky.
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02-09-2015, 12:44 PM | #56 | |
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i'll keep everyone updated on how the fluid + filter change goes and how DCT relearn/adaptation goes. fingers crossed.
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02-09-2015, 03:56 PM | #57 | |
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Manuals are not an idiot proof toy by virtue of their direct command from man to machine unlike dct and as most BMW manuals it's not the friendliest manual to learn on (especially for americans used to automatic muscle cars) Well used it is bulletproof. Synchro problems ARE all user misuse and abuse. Not factory or design issues like DCT. And ask any dealership that sees a lot of M3, they'll tell you dct complaints and mechanical problems are becoming more prevalent. While manual issues are always related to misuse of the freedom it gives you. And yes the dct was supposed to be maintenance free. That pretense is gone now people, now it's already about when will it start to slip and end life. BMW mdct 2008 official publication quote : "Dry sump lubrication, in turn, guarantees a high standard of reliability and maintenance-free function throughout the entire running life of the car." maintenance free throughout the entire life of the car. Getrag was much too optimistic Last edited by V8FunNaturally; 02-09-2015 at 04:03 PM.. |
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02-09-2015, 05:04 PM | #58 |
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BMW's decision to claim that the DCT would be maintenance-free was ill-advised. It seems unwise to never change the lubricating fluids in any gear-based transmission for a variety of reasons.
On another topic, the folks who are making it a personal vendetta on this forum to lambaste particular options they did not purchase (convertible tops, moonroofs, DCTs, etc.) look pretty foolish, IMO. If I had a bad experience with something on my car and could pass that on to others here that is one thing. To be harping on about 'this and that sux' even though I've never owned one or had this happen, and everything I think I know I read on a forum, well, we could do better. Every forum has a level of maturity and this one could use an upgrade. |
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02-10-2015, 09:39 AM | #60 | |
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So many little 6m vs DTC bitches in the thread. Move on and leave your daddy's m3 alone he bought a 6m or DCT for a reason, stop crying yourselves to sleep. OP I feel your pain man. Like others have said give it a rinse with some fresh fluids and see how it goes.
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02-10-2015, 11:43 AM | #61 | |
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02-10-2015, 12:03 PM | #62 | |
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02-11-2015, 10:13 PM | #63 |
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Tinkered in my spare time? Dude, I build, design and re-engineer transmissions. Its my profession. Youre the one talking about gear strength etc. When your manual breaks, don't give me a call to fix it properly.
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02-11-2015, 11:09 PM | #64 | |
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02-11-2015, 11:44 PM | #66 | |
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That said, you are right the wet clutch packs is the weak link not the gearing. A stock dct can overheat in a hot day if pushed continuously until the computer puts the car in limp mode. |
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