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Thread: 85 R80RT fork seal replacement

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  1. #1
    Registered User nugentch's Avatar
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    85 R80RT fork seal replacement

    I need to replace the fork seals on my '85 R80RT. I have looked in my trusty Clymer's and Haynes and according to them (at least as far as I can see) I need to totally remove the forks to do this. I have replaced fork seals on an R90S before and do not remember it being that big of a deal.

    Can anyone provide any guidance to me on this. Replacing the fork seals should not be an all day event.

    Any help would be appreciated.
    Ride Safe!
    Curtis "Kurt" Nugent
    1985 BMW R80RT (Heidi)
    2006 BMW R1200GS (Brunhilde)
    BMWMOA #28698, BMWRA #23815,
    ABC #3488, AMA #657795

  2. #2
    Registered User
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    Now would be a good time to re-grease the steering head bearings, since it is not much more work. The instructions in the Clymers and Haynes are for removing the forks. The owner needs to modify the instructions to allow removal of the lower legs to replace the seals and not the entire fork assembly. The springs for the forks need to be released - which means the handlebars and fork plugs need removal. Once the fork spring is uncompressed, the bottom yoke pitch bolts are loosed to help in removing the lower fork. Remove the lower fork, replace the seals, then reassemble. Good luck!


    edit: here is a thread talking about replacing gaiters on a R90/6 and adding fork seals. http://forums.bmwmoa.org/showthread....ferrerid=51262
    If your R80RT does not have gaiters, that may be the reason you are replacing the fork seals.
    Also, the springs to not need to be uncompressed to remove the lower sliders. Following the link description or that from lostboy will work. The Clymer and Haynes (and my) descriptions require unnecessary steps.
    Last edited by Stan_R80/7; 09-29-2012 at 02:08 PM. Reason: Added info
    Stan

    AH# 13238

  3. #3
    Rally Rat
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    Renewing the fork seals in your current bike is not a lot different than on your R90S. Remove the front wheel and fender, then remove the 8mm bolt that retains the slider, which is visible once the axle is removed. You may need an impact wrench to remove these screws because the damper rod tends to rotate with the bolt. Once the bolts are out, pull the sliders and fork brace as one. Renew the seals. Reassemble and refill the oil through the holes at the top of the fork.

  4. #4
    Registered User nugentch's Avatar
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    Quote Originally Posted by Stan_R80/7 View Post
    Now would be a good time to re-grease the steering head bearings, since it is not much more work. The instructions in the Clymers and Haynes are for removing the forks. The owner needs to modify the instructions to allow removal of the lower legs to replace the seals and not the entire fork assembly. The springs for the forks need to be released - which means the handlebars and fork plugs need removal. Once the fork spring is uncompressed, the bottom yoke pitch bolts are loosed to help in removing the lower fork. Remove the lower fork, replace the seals, then reassemble. Good luck!


    edit: here is a thread talking about replacing gaiters on a R90/6 and adding fork seals. http://forums.bmwmoa.org/showthread....ferrerid=51262
    If your R80RT does not have gaiters, that may be the reason you are replacing the fork seals.
    Also, the springs to not need to be uncompressed to remove the lower sliders. Following the link description or that from lostboy will work. The Clymer and Haynes (and my) descriptions require unnecessary steps.
    Quote Originally Posted by lostboy View Post
    Renewing the fork seals in your current bike is not a lot different than on your R90S. Remove the front wheel and fender, then remove the 8mm bolt that retains the slider, which is visible once the axle is removed. You may need an impact wrench to remove these screws because the damper rod tends to rotate with the bolt. Once the bolts are out, pull the sliders and fork brace as one. Renew the seals. Reassemble and refill the oil through the holes at the top of the fork.

    Thanks! That what I was looking for!
    Ride Safe!
    Curtis "Kurt" Nugent
    1985 BMW R80RT (Heidi)
    2006 BMW R1200GS (Brunhilde)
    BMWMOA #28698, BMWRA #23815,
    ABC #3488, AMA #657795

  5. #5
    Registered User
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    May 2006
    Posts
    174
    Install fork boots when you have it apart. They will work on an RT. Disgard the old fairing opening boots.

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