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Thread: Transmission keeps leaking

  1. #1
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    Transmission keeps leaking

    Two years ago when i had the transmission swap i had everything refreshed (by a shop) so they should have replaced everything. The leak never stopped, so recently i had the shifter seal replaced, still leaked, then i had the output shaft seal replaced, it still leaks. Now it appears that the shifter seal is still leaking, what gives? Do i have the shifter seal replaced AGAIN? FYI i have Redline gear/transmission oil.
    What are your thoughts?

  2. #2
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    Quote Originally Posted by n2bimmer View Post
    Two years ago when i had the transmission swap i had everything refreshed (by a shop) so they should have replaced everything. The leak never stopped, so recently i had the shifter seal replaced, still leaked, then i had the output shaft seal replaced, it still leaks. Now it appears that the shifter seal is still leaking, what gives? Do i have the shifter seal replaced AGAIN? FYI i have Redline gear/transmission oil.
    What are your thoughts?
    Make sure it's not the vent plug. I believe there is an over pressure vent plug near the shifter rod. Only if you say it had been dry between seal replacements, then it's probably your rod seal. Hopefully there isn't a defect on the rod like a sharp edge damaging the seal each time.
    '88 635, '92 325IC, '99 323

  3. #3
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    Quote Originally Posted by carsnplanes View Post
    Make sure it's not the vent plug. I believe there is an over pressure vent plug near the shifter rod. Only if you say it had been dry between seal replacements, then it's probably your rod seal. Hopefully there isn't a defect on the rod like a sharp edge damaging the seal each time.

    A vent plug? i was not aware of such a thing. Yes hopefully its not damaged..
    FYI i have a 265/6 transmission.

  4. #4
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    Quote Originally Posted by n2bimmer View Post
    A vent plug? i was not aware of such a thing. Yes hopefully its not damaged..
    FYI i have a 265/6 transmission.
    I think it's this. see attachedgetrag 265-6.JPGgetrag 265-6 r1.JPG
    Also check that it is not overfilled.
    '88 635, '92 325IC, '99 323

  5. #5
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    Thanks but it’s definitely not that

  6. #6
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    Here is what it looks like


    Sent from my iPhone using Tapatalk

  7. #7
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    I've never seen a significant leak like that.

    Sorry... I know that's not much help.

  8. #8
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    Quote Originally Posted by tschultz View Post
    I've never seen a significant leak like that.

    Sorry... I know that's not much help.

    Really? all the more reason to get it fixed ASAP.

  9. #9
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  10. #10
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    realoem says an '81 628 Euro is # 6
    06 Ventilation valve 1 23111224051

    http://www.realoem.com/bmw/enUS/show...diagId=23_0014
    Last edited by master6; 01-12-2018 at 07:00 PM.
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  11. #11
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    Quote Originally Posted by master6 View Post
    realoem says an '81 628 Euro is # 6
    06 Ventilation valve 1 23111224051

    http://www.realoem.com/bmw/enUS/show...diagId=23_0014


    I just dont see the oil leaking from that valve all the way down to the output driveshaft. Do you?

  12. #12
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    Quote Originally Posted by n2bimmer View Post
    I just dont see the oil leaking from that valve all the way down to the output driveshaft. Do you?
    Yes--As the oil is blown onto the spinning guibo, the oil is splashed above the guibo and accumulates above the guibo.

    So, when you jack up the car, the oil that splashed above the spinning guibo, has time to drip on said guibo.

    Not saying it's the valve, but knowing Jody, he's probably nailed it.

  13. #13
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    Quote Originally Posted by 1986series6 View Post
    Yes--As the oil is blown onto the spinning guibo, the oil is splashed above the guibo and accumulates above the guibo.

    So, when you jack up the car, the oil that splashed above the spinning guibo, has time to drip on said guibo.

    Not saying it's the valve, but knowing Jody, he's probably nailed it.


    Ok, thanks. So if i jack up the car can access the inspect this valve with a small mirror? What's involved in replacing the valve? Must the transmission be lowered? or can i see it from inside the car through the shifter. Im tired of taking the car back to the shop, I need to know before taking it back again as the part does not seem to be in stock.
    Last edited by n2bimmer; 01-15-2018 at 12:59 AM.

  14. #14
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    I would look through the shifter at first, if you can't see it from there jack it up and
    use the mirror. I don't think you'll be able to change it without at least lowering the tranny somewhat.

    Turner shows a plastic part that looks like it snaps in from the top.

    https://www.turnermotorsport.com/p-4...uine-bmw-part/


    I don't think the valve has any working parts. I it's just a vent hole.

    I would want to know what's causing the ATM fluid to be pushed out from the vent valve.

    Over filled, excessive pressure, maybe cracked vent valve or the lip of the valve isn't sealing anymore?

    That's the best I can offer.

    Hope someone can chime in with more knowledge.

  15. #15
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    Thank you very much.. i will try it out.

  16. #16
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    Quote Originally Posted by carsnplanes View Post
    I think it's this. see attachedgetrag 265-6.JPGgetrag 265-6 r1.JPG
    Also check that it is not overfilled.


    Thats strange. In your photo here the vent plug is further back (towards the engine) however in realoem for my car the vent plug is closer to the shifter. If this is right it is VERY likely that could be the leak.

    https://www.realoem.com/bmw/enUS/sho...diagId=23_0014

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