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      03-12-2021, 12:36 PM   #1
andrei.m4
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Dct shaft seal leak, common issue?

Hi, today i took out the dct from my f82 to replace the flywheel because it have wear at damper springs.
3 months ago i replaced the oil pan because it was looking like it leak, but after replace car still leaks, today when i took out the gearbox i found the oil is from main shaft seal from gearbox. I ordered both seals, gearbox and engine side to replace them.
Is this dct shaft seal leak a common issue? I am glad i found it at right time, gearbox still have enough oil.
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      03-16-2021, 09:14 AM   #2
andrei.m4
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Update, seems 90% of oil leak was from engine side seal and 10% from gearbox seal. I replaced both.
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      03-16-2021, 11:02 AM   #3
sagi
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Thanks for the update! Good to know these things for the future!🙏
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      03-16-2021, 12:15 PM   #4
andrei.m4
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Yes, if somebody take out the gearbox for replace something it is better to replace these 2 seals. I replaced the oil pan because of this oil leak without succes
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      04-19-2021, 08:19 AM   #5
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Quote:
Originally Posted by andrei.m4 View Post
Yes, if somebody take out the gearbox for replace something it is better to replace these 2 seals. I replaced the oil pan because of this oil leak without succes
Just stumbled across this thread. With your leaky rear main seal (seal on engine side) did you have a chirping sound on idle? Sounds like birds or chickens. (Yes Iíve checked if there are birds. )

I currently have a chirping sound when at idle. Itís linked to the PVC because when I open the oil cap it stops chirping. Itís not the cylinder head case as in other peopleís case because I canít hear the noise from the engine bay. I only hear it from below the car.

BMW say that itís most likely the rear main seal but need to remove my gearbox to make sure. Itís not leaking currently from what I can see but they say itís only a matter of time.

If you had the same sound before replacing then at least I know Iím on the right track.
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      04-19-2021, 01:55 PM   #6
andrei.m4
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No sound, only leak. Your sound is coming from pcv.
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      04-19-2021, 09:56 PM   #7
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All the PCV videos though show that you can hear the sound in the engine bay with the hood open. I can only hear mine from just Nijinsky the wheel well.
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