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1Back to top Go down   Final drive output seal replacement Empty Final drive output seal replacement on Wed May 22, 2019 11:01 pm

Oliveri

Oliveri
Silver member
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Hi Guys, haven't been keeping track of what's going on. For that, I apologise. Just noticed Inge is no longer with us. Sad My RT has been running well and still fun to ride. However, just noticed a small oil leak from the Final drive, appears to be the output seal. Are there any tips & tricks to replace this. Any suggestions would be greatly appreciated.


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"Keep the paint up, and the rubber down
Final drive output seal replacement Bike
1988 K100RT...#0096960 ..."Heisenberg"...Status: Work in progress
http://www.vintagesteelworks.com
    

2Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Thu May 23, 2019 3:51 am

charlie99

charlie99
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lots of posts about this throughout the forum

yes, it is relatively easy to do , if you have some mechanical skills
however there are warnings about replacing the case seal as well , and caution with splitting the bevel box halves ...ie the bolts and tools for the process

there are a few alternate seals available ...but resurfacing the axle part - hub is recommended  if fitting any new seal to rotating metal shaft ..(eliminates the sharp edge of the old running - mating surface at the seal edge interface )

good luck !


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFinal drive output seal replacement Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

3Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Thu May 23, 2019 8:51 am

mike d

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Have you checked for any play in the wheel. Sometimes as the bearing begins to fail, you get oil weeping passed the seal. 

If the bearing is o.k. then replacing the seal is easy enough.

Mike

    

4Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Thu May 23, 2019 11:14 pm

Oliveri

Oliveri
Silver member
Silver member
Charlie, got me thinking... Hard to tell if it is actually the output seal or the case seal. I have no oil on the disk and when i'm wiping it of i can't really tell if it comes from the bevel box halves. i know for sure it is not the drain plug. I suppose the only way i can be certain is by taking the disk off. 
How much of a drama is it to do the case seal? Once pulled apart i'll have to do both anyhow.


__________________________________________________
"Keep the paint up, and the rubber down
Final drive output seal replacement Bike
1988 K100RT...#0096960 ..."Heisenberg"...Status: Work in progress
http://www.vintagesteelworks.com
    

5Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Fri May 24, 2019 12:05 am

duck

duck
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Unless it's been removed before taking the rear disk off can be difficult and often requires drilling the bolt heads off due the uber threadlocker BMW used at the factory as well as time.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

6Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Fri May 24, 2019 12:18 am

RicK G

RicK G
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The main seal ans O-ring between the halves is easy as Duck says the allen head countersunk screws can be difficult. I put the key in the hex and hold some tension then apply heat, they usually come out as the heat melts the red loctite. Don't just try to undo them without the heat unless you know for sure they have been out before and will come easily.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

7Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Fri May 24, 2019 1:40 am

duck

duck
Life time member
Life time member
And when you reinstall the rear disk I always use anti-seize instead of thread locker in case I ever need to remove it in the future. My guess is that the BMW engineers spec'd threadlocker to be extra safe on brakes but since the lug bolts that also hold the wheel on also hold the rear rotor on I think it's overkill.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

8Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Thu Jun 20, 2019 2:17 am

Oliveri

Oliveri
Silver member
Silver member
Thanks again for all the helpful tips. All went pretty well, the disc came off quite easily. Indicating it had been off once before. The allen casing screws....hmmm, a little tight. But heating them most certainly did the trick. However, they already looked a bit worn before i got to them. I have put it all back together again and all is well. But i would like to replace them regardless. If i have to pull it apart again in the future, i want to make sure i don't need a drill to do it. 

Where can i buy the right 8 hex bolts? The heads on them look a bit 'lower' than they usually are, since the disk bolts are very close. There isn't a lot of clearance.


__________________________________________________
"Keep the paint up, and the rubber down
Final drive output seal replacement Bike
1988 K100RT...#0096960 ..."Heisenberg"...Status: Work in progress
http://www.vintagesteelworks.com
    

9Back to top Go down   Final drive output seal replacement Empty Re: Final drive output seal replacement on Thu Jun 20, 2019 3:25 am

RicK G

RicK G
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This is where I buy most of my bolts etc. https://www.bolt.com.au/


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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