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Thread: Rear Tranny seal on 98 M' Roadster

  1. #1
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    Rear Tranny seal on 98 M' Roadster

    Hello,
    Looks like I have a slow leak from the rear transmission seal. Does anyone have an idea how many hours it would take a shop to replace the seal? Looks like the exhaust needs to be removed to perform this job. Just trying to get an idea of how much to expect to pay without the shop trying to gouge me.
    Thanks for your input!

  2. #2
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    Hello - take a look at the link below to our site's DIY tech articles on the transmission. It'll give you a good idea of the time-frame and cost for certain procedures. Hope this helps you out a bit.

    https://www.pelicanparts.com/BMW/tec...m#transmission
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  3. #3
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    Are you sure that its the rear transmission seal that is leaking? The gear shifter seal above it is the usual culprit.
    2000 2.0L Z3 Roadster, Mora Red, Individual, Originally from UK, daily drive.
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  4. #4
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    No, I'm not sure. That's good advice, i'll need to verify. Thanks

  5. #5
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    You have a ZF transmission. It is not the same as the Getrag Pelican pointed you to.

    The bad news. If it is the rear seal, it can not be changed without special tools. The flange is a serious interference fit, requiring a hefty puller to remove and a special tool to press it back on. If you try and drive it on with a hammer as suggested in the DIY, you will destroy the 5th gear synchronizer assembly.

    The good news. On the ZF it's always the shifter shaft seal.


    /.randy

  6. #6
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    Shift-shaft seal; I've replaced dozens upon dozens of them.


  7. #7
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    Quote Originally Posted by Randy Forbes View Post
    Shift-shaft seal; I've replaced dozens upon dozens of them.

    Is the Shift Shaft seal the same as the Selector shaft seal? If thats the case then I already replaced it a few months ago and perhaps its leaking again.

  8. #8
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    I need to do this one now on the coupe. I noticed it on the roadster I sold but the coupe is definitely leaking. Easier to spot in roadsters because they don't have that plastic floor that retains much of the drip.

    Anyway, is the concencus to still tap another one in vs trying to remove?

  9. #9
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    Quote Originally Posted by workhurts View Post
    I need to do this one now on the coupe. I noticed it on the roadster I sold but the coupe is definitely leaking. Easier to spot in roadsters because they don't have that plastic floor that retains much of the drip.

    Anyway, is the concencus to still tap another one in vs trying to remove?
    Or a good tip on how to get the old one out. In for answers.

  10. #10
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    How many hours would it take a competent mechanic to replace the shift shaft seal on an M roadster assuming exhaust needs to be removed. Thanks

  11. #11
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    3 hours, per Pelican.

  12. #12
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    Quote Originally Posted by OCRentAPopo View Post
    Or a good tip on how to get the old one out. In for answers.
    I have long been an advocate of pushing the existing seal inward (1/4-5/16"?) and putting the new seal in over the top of it.

    The primary reason is to eliminate any potential damage to the surface of the shaft (shift or selector, same thing here) as once it's scored, you're screwed as far as sealing goes. A secondary benefit is that the old seal will now be working on a new section of the shaft and the new one only has to deal with the slight dribble that gets past it.

    ALWAYS (ALWAYS, ALWAYS!) lubricate the seal before installation. ALWAYS!

    Our (other) esteemed Randy on here warns that if the seal is driven in too far, that it will foul the range of motion, so only go in as far as necessary to seat the second seal (I've probably done this seal replacement 40-50 times, and never experienced too far__and that was before the warning).

    There are however, a couple of tools that I only recently discovered__thanks to someone on here posting about them__and one removes the existing seal and the other is to drive a new one in. I'm undecided if I'll continue doubling up the seals, although I do get a kick out of working with new single-purpose tools...

    Extractor:





    Installer:



    Last edited by Randy Forbes; 01-12-2019 at 08:14 AM.

  13. #13
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    Awesome write-up as always, Randy. Truly appreciated.

  14. #14
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    No one does tool porn like Randy

  15. #15
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    Quote Originally Posted by z3forlife View Post
    No one does tool porn like Randy
    I must insist on the removal of gloves for future pics plus more oil. Thanks.

    Were the tools expensive or difficult to order?

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