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Thread: rear differential seal

  1. #1

    rear differential seal

    Hello everyone... I haven't visited much lately. after a long break for racing season... I'm back to the restoration of the 1971 R75/5

    so this bike has been off the road for 26 years.

    I start my question that way so that I can explain why I'm digging so deep
    the bike was apparently taken off the road, for the reason of a pinched points wire
    but it sat... in 3 different states...


    all of the rubber is rotten
    I've taken the bike down to nuts and bolts
    I've replaced all of the motor seals

    My question today:
    what do I want to do with the rear differential

    I've read snowbumms documents about fluid transfer

    I don't know if my seal is bad... but based on the findings of all of the other seals... I would guess its dried up, old, and crusty

    I searched the forum without success
    would folks recommend addressing this seal now, so as to avoid a big mess in the future?
    the swingarm.. everything... is removed from the frame.
    is there a how to thread or article?

    I see the cycle works tools.
    I'm worried about messing up the pre-set on things... digging into something I'm not familiar with

    what input do you all have.
    surely someone has some hands on experience I could benefit from

    thanks in advance
    brant in Colorado

  2. #2
    Liaison 20774's Avatar
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    I didn't find any related videos, but Matt Parkhouse has an article in the September 2016 ON about final drives. Might a place to check out.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Quote Originally Posted by 20774 View Post
    I didn't find any related videos, but Matt Parkhouse has an article in the September 2016 ON about final drives. Might a place to check out.
    good Info as Always sir!

    I only joined MOA in 2019

    I'll ask around
    Brooks lives within driving distance
    I'll ask to see if I can find the article

    thanks!

    anyone else have experience with this job?
    brant

  4. #4
    Liaison 20774's Avatar
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    The later ON issues are online on the main MOA webpage. Go to bmwmoa.org, click on owners new and archives. In the drop down box click on 2016 and find the issue.

    You might also check with Brook's online blogs...he might have done this before.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  5. #5
    Registered User ebeeby's Avatar
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    Even Matt recommends Hansen's for final drive work:

    https://www.hansensmc.com/--spline-repair
    1973 R75/5

  6. #6
    Registered User cwroady's Avatar
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    I found this helpful when replacing the pinion gear seal in my 1973 75/5.

    https://www.youtube.com/watch?v=9rw6IQcBnXQ
    Chris - 2015 BMW RT / 1973 BMW R75/5 / 1955 BMW R50 - Yard Art - 1968 Hodaka / 1968 Sachs
    President SCBMWRC https://scbmwrc.com/ https://www.facebook.com/groups/scbmwrc/
    MOA / Airhead Beemer Club

  7. #7
    Liaison 20774's Avatar
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    Quote Originally Posted by cwroady View Post
    I found this helpful when replacing the pinion gear seal in my 1973 75/5.

    https://www.youtube.com/watch?v=9rw6IQcBnXQ
    This is just one of a series of tutorials on the R90/6 series by Boxer2Valve:

    http://www.boxer2valve.com/bmw/R90slash6Tutorials.html
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  8. #8
    Perfect...
    thanks you all!

    the video is exactly what I was looking for

    I went through all of brooks site, but didn't see that he has documented this job

    the video gives me courage to move forward
    thanks everyone!

    brant

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