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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


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  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.

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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

  17. #17
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    So i had the car back at the shop, they replaced the shifter seal again, and had the tranny looked over again and looked at the vent valve and appears to be ok and not leaking. However the tranny still leaks. Ralph over at bigcoupe suggested to ditch the synthetic oil and use non synthetic. What oil do you all recommend?
    thanks

  18. #18
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    Quote Originally Posted by n2bimmer View Post
    So i had the car back at the shop, they replaced the shifter seal again, and had the tranny looked over again and looked at the vent valve and appears to be ok and not leaking. However the tranny still leaks. Ralph over at bigcoupe suggested to ditch the synthetic oil and use non synthetic. What oil do you all recommend?
    thanks
    Hi,

    Were is the leak coming from ? top ?
    bottom ? seals ?

    Don't hang on the oil....
    Inside my Getrag 260 I have full synthetic
    oil for decades as well on all my customer's
    E34M5s at the shop no leaks.

    Use Red Line MTL and you are fine.

    A little trick for you. When you fill the oil
    inside the tranny don't over fill it. When
    you fill the oil from the side plug and
    then you wait till the oil start coming over..
    then let it drain till it stops. Reason being
    is you don't want the oil to be in level of
    the front and back seals. Most people do
    over fill the tranny.

    Rear Tail output Flange. I have found that
    Flange warps in time and say if you still
    replace the rear main seal then still leaks
    then the output flange must be replaced.

    Also the in put shaft seal is a major
    leak on this tranny. With miles they Input
    shaft bearing wares and it does make a play
    and when the shaft bounces up and down
    on throttle and off throttle and the oil finds
    its way out...even the return line
    is not helping....

    Vent tube is also an area to look over but
    knowing how good the vent system is design
    its less likely.

    Also, very important is how you press the
    seals !!! They have to be very evenly pressed
    in. It take time to press the seals in properly
    and very even.

    I am suggesting areas to look over. I don't
    have the transmission in front of me so I can
    see it all in details and pin point the problem.

    Regards,
    Anri
    Last edited by sofiabghome; 01-30-2018 at 11:05 AM.
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  19. #19
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    Quote Originally Posted by sofiabghome View Post
    Hi,

    Were is the leak coming from ? top ?
    bottom ? seals ?

    Don't hang on the oil....
    Inside my Getrag 260 I have full synthetic
    oil for decades as well on all my customer's
    E34M5s at the shop no leaks.

    Use Red Line MTL and you are fine.

    A little trick for you. When you fill the oil
    inside the tranny don't over fill it. When
    you fill the oil from the side drain plug and
    then you wait till the oil start coming over..
    then let it drain till it stops. Reason being
    is you don't want the oil to be in level of
    the front and back seals. Most people do
    over fill the tranny.

    Rear Tail output Flange. I have found that
    Flange warps in time and say if you still
    replace the rear main seal then still leaks
    then the output flange seal must be replaced.

    Also the in put shaft shaft seal is a major
    leak on this tranny. With miles they Input
    shaft bearing wares and it does make a play
    and when the shaft bounces up and down
    on throttle and off throttle and the oil finds
    its way out...even the return line
    is not helping....

    Vent tube is also an area to look over but
    knowing how good the vent system is design
    its less likely.

    Also, very important is how you press the
    seals !!! They have to be very evenly pressed
    in. It take time to press the seals in properly
    and very even.

    I am suggesting areas to look over. I don't
    have the transmission in front of me so I can
    see it all in details and pin point the problem.

    Regards,
    Anri

    Thanks Anri, the leak is coming from the top of the rear of the tranny, as you can see from the picture posted previously.

    The oil should be at the right level as he removed the fill bolt and the oil did not pour out.

    I donít know what to say about the rear flange.
    At this point i really would like some positive results.




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  20. #20
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    Hi,

    Okay I sow the pics posted earlier.
    Well you have to remove the guibo
    and see were is the leak coming from.

    Top small sector rod ? how far the seals
    were pushed ?

    Also when your Mechanic installed the
    output flange and tight the big nut
    did he use sealant to seal and block
    the oil coming from inside to outside ?
    I mean for the splines..were the flange
    slides ?

    There is something not done right !

    Regards,
    Anri
    Last edited by sofiabghome; 01-30-2018 at 01:46 AM.
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  21. #21
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    Quote Originally Posted by sofiabghome View Post
    Hi,

    Okay I sow the pics posted earlier.
    Well you have to remove the guibo
    and see were is the leak coming from.

    Top small sector rod ? how far the seals
    were pushed ?

    Also when your Mechanic installed the
    output flange and tight the big nut
    did he use sealant to seal and block
    the oil coming from inside to outside ?
    I mean for the splines..were the flange
    slides ?

    There is something not done right !

    Regards,
    Anri


    Im thinking of having the guibo removed and drive the car in the air and visually see where its leaking from. Im really hoping there are no cracks on the rear cover.

  22. #22
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    Im beginning to think that there may be a crack at the rear cover around the shifter rod. The mechanic thinks they are scratches though.




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    Last edited by n2bimmer; 01-30-2018 at 09:54 PM.

  23. #23
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    Hi,

    Okay, another area to look for.

    I have seen many shops when they
    replace the selector rod small seal
    and some times if you are not patient
    it is very very tricky to remove.
    There is certainly a change you
    scratch the sector shifter rod and
    when you are going thru the gears
    then and the rod goes back and
    forth then the scratch area will held
    oil and throws it outside.

    Again I am not saying your mechanic
    scratch the rod but area to look over.

    Another area to pay attention is this
    265s they have a lot bolts are going
    through the casings and it is very
    important to use the proper method
    to re-seal the casings and the bolts.

    From age and heat circles the aluminum
    warps and it is possible when hot it
    lifts off in some area were the oil is
    finding its place to escape.

    From the picture I think your flange is
    all in oil so I think you clean the tranny
    using brake cleaner and shop air to blow
    all the oil and make it bone dry.

    Then jump inside the let the engine
    warm up and play with the revs then
    let see.

    I am sorry you have this oil leak issue
    but we will find it.

    Regards,
    Anri
    Last edited by sofiabghome; 01-31-2018 at 12:43 AM.
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  24. #24
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    Quote Originally Posted by n2bimmer View Post
    Im beginning to think that there may be a crack at the rear cover around the shifter rod. The mechanic thinks they are scratches though.
    That would make more sense and it appears that could be your problem! Looks more like a crack to me since it protrudes all the way to the edge of the boss. Why doesn't your mechanic try and get closer to it to tell for sure?

  25. #25
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    Thanks for the help guys..

    im really hoping its not cracked. What are the chances of finding a cover???
    I know aluminum can we be welded but welding this spot would be a nightmare around the rod.

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