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1Back to top Go down   leak on final drive? Empty leak on final drive? on Sat Oct 26, 2013 1:21 am

snowbeard

snowbeard
Silver member
Silver member
so upon first sight of the new K100 I noticed a leak at the rear drive. I was told it may just need a new crush washer, but having just refreshed the oil there and replaced the washer, I still get the oil dripping down the inside of the drive, onto the brake disc, and pooling on the wheel!!! Mad 


So the Haynes manual said to fill it to the inside most threads of the filler cap, but that it shouldn't touch the bottom of the filler (how you know that with the damn filler on I have no idea!!)  It said if overfull it would come out the overflow tube. 

now you don't suppose this is overfilled and just coming out the overflow (where is the overflow anyways?)  or do I have seepage around my drive cush?

    

2Back to top Go down   leak on final drive? Empty leak on final drive? on Sat Oct 26, 2013 2:39 am

RT

RT
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The usual suspect for a final drive leak is a drip of oil onto the floor from the bottom of the unit or where it joins the drive shaft, not from the top of the final drive unit. 
Take the filler plug out again and with a torch peer down into the fill hole. The oil level should be just touching the bottom of the screw thread. Sounds to me like it is overfull and forcing out the breather cap.
Good luck


__________________________________________________
2011 R1200RT
    

3Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 3:35 am

snowbeard

snowbeard
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no, it seems to be coming either from the lower drain plug or the inside of the unit, between the wheel and the drive...

    

4Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 4:37 am

charlie99

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more than likely the output bevel drive seal .(fits right near the bolts of the housing to wheel mount shaft )

easy fix .....you can buy the right seal almost anywhere ...

don't forget to linish up the main output shaft a little bit to let the new seal bed in properly
looks like I have to do mine again pretty soon ....(might have to check that output bearing whilst im at it too ...though cant see any movement so far )


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Oleak on final drive? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

5Back to top Go down   leak on final drive? Empty leak on final drive? on Sat Oct 26, 2013 6:18 am

RT

RT
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Well seems like I might be in the same boat just a little smear of a leak around the seal.
Let me know what part you order charlie so I don't make a mistake with mine and snowbeard can be happy he has set us off on a mission.
I'm not doing mine till it gets too hot to ride, have to get a big trip in before xmas.


__________________________________________________
2011 R1200RT
    

6Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 6:24 am

RicK G

RicK G
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Take the wheel and disc off the back and have a look at the big seal behind the disc that is most likely where it is leaking. The breather is right at the top of the drive and you need to have a lot in there for it to come out there and you will see it all over the outside of the drive.
Take care with the 2 countersunk socket head bolts that hold the disc on the may need heat to release the loctite.


__________________________________________________
"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   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 7:07 am

MikeP

MikeP
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If you do need a new seal, buy a new O-ring too. They often need replacing once they're disturbed.


__________________________________________________
1992 K1
1993 K1100R (used to be an LT)
    

8Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 7:17 am

charlie99

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aye indeed mike !


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Oleak on final drive? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

9Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 4:51 pm

snowbeard

snowbeard
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Silver member
great advice, glad to hear its not too big of a job!  

So Charlie, if you have a part number, or a good online source I'd love to hear it, for the seal and the o-ring (?) that Mike mentioned? 

Also, what was that about "linish" up the main output shaft a little bit to let the new seal bed in properly


I assume linish is a typo but I can't imagine what you meant? lube? finish? line up? Razz 


Thanks!!!

    

10Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 5:25 pm

mike d

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Hi Snowbeard, 





From Wikipedia......



Linish is an engineering  term that refers to the process of using grinding  or belt sanding  techniques to improve the flatness of a surface. The flatness may be two-dimensional , i.e. with the view of achieving a flat plate, or one-dimensional , e.g. with the view of achieving a perfectly cylindrical  shape. The machine  that does this may be called a linisher or a linish grinder. The technique may also be used, with finer grades of grindstone or sanding belt, to polish a surface.

Mike

    

11Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 5:32 pm

snowbeard

snowbeard
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oh, don't I feel silly now! Wink 

so is this something safe to do by hand with just a piece of 1500 grit sandpaper?  are these drives often not finished cleanly enough?

    

12Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 5:46 pm

walfish

walfish
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Snowbeard - Yes and Yes,  it is recommended to clean off any residue or crud which may be on the shaft.
leak on final drive? 22936


__________________________________________________
leak on final drive? Uk-log10 88 K 100  0033026 
   
                            92 K 1100 LT  6455097
    

13Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 7:08 pm

charlie99

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hi snowbeard

the linish process is to
1> take off the sharp edge where the old seal has been running into the metal (soft things wear hard things ) and will form a groove of somewhat pitted appearance  ...this could damage the seal edge of the new seal if left intact, either by the installation process ...or further long term wear in the same location

2> clean up the shaft across its length towards the installed position of the seal ....this will remove crud that accumulates (often over years of being exposed to the atmosphere and all the rest of the things that corrode metal things )

all that is necessary is to get a strip of  wet and dry (fine grade ) maybe 1 foot long by about 1 inch wide and use it in a manner of wrapping it partially around the shaft and using a pulling motion to kind of seesaw  the material back and forth

maybe worth mentioning that that shaft is really hard material (possibly heat treated for case hardening ?)

you might have to do the process with several strips of wet and dry to get a good finish

ill look up the seals guys ...

the outer seal around the bevel box housing is a fairly standard o ring ....(just need the right length and diameter )

the big shaft seal is another fairly common size
from memory ..the original is 10 mm thick ...although the local guys stocked a 12 mm one which I got ....advised by the bearing guys that it would be safe to cut off a small area on the inner part of the seal face (away from the seal side ) which brought the dimensional width back to about 10 mm  and lined up with the seal housing edge  and depth

I posted my refurb in here some where ....a while ago now ...maybe 2 years ...ill go have a look and see what I can find ...

back soon

link for some pics .....theres more out there somewhere
https://www.k100-forum.com/t1833-85-rt-resto-my-attempt-hey-im-not-into-making-a-show-bike#16702

the housing seal o ring is  171 mm  by 2.62 mm thick ...so easy to find

the shaft seal  is 85mm x 110mm x 10 mm  
sorry don't have the part numbers that I bought
but look for the ones that have some form of nitrile component in the seal for long duration oil and heat resistance


or have a look in this same section (bevel drive ) for the parts listings
http://realoem.com/bmw/showparts.do?model=0504&mospid=51753&btnr=33_1565&hg=33&fg=76

hope that helps


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Oleak on final drive? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

14Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 8:44 pm

sidecar paul

sidecar paul
Life time member
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Hi snowbeard,
Just a tip.
 If the seal bearing surface is pitted and won't clean up by linishing, fit the new seal slightly proud (say 2mm) of the casing so that the seal lip runs on an unworn section. 

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

15Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 9:26 pm

duck

duck
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It it was factory installed, getting the rear brake disc off can be a hassle.  Between the uber-Loctite the factory installed those two bolts with and a little corrosion over the years those can be a bear to get out.

Do it before you take the final drive off so you can get some good leverage on them. Heat them lots with a torch, use a GOOD Allen wrench (like the one in the factory toolkit) and pray.

Even then the Allen head may strip so be prepared to drill the heads off.  If you do it carefully then there's plenty of threads left so you can use Vise-Grips to get the rest of the bolt out.

When I re-install them I use anti-seize in case I ever need to remove the rotor again.



Last edited by duck on Sun Oct 27, 2013 7:04 pm; edited 1 time in total


__________________________________________________
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
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

16Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sat Oct 26, 2013 9:48 pm

sidecar paul

sidecar paul
Life time member
Life time member
+1 duck, also they don't need to be tight, they're only there to hold the disc for assembly and when the wheel is in place they can't come out anyway.

Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

17Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Sun Oct 27, 2013 6:38 pm

snowbeard

snowbeard
Silver member
Silver member
Thanks Tons!! That really helps and I find a few seals using the RealOEM site to have part #33121241938. I can find this on some sites as well as Ebay so I will order it and go forth cheers 




may as well do  the spline lube while I'm in there, and hope I can get those pesky rotor bolts out  :-/  

    

18Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Tue Oct 29, 2013 6:31 pm

snowbeard

snowbeard
Silver member
Silver member
so I just want to be sure that I'm ordering the right part here, it came up with the part number I found from REALOEM, but the seller doesn't list it as K100, only R100... it has the dimensions that Charlie specified so I'm assuming its correct... ?

http://www.ebay.com/itm/BMW-Motorcycle-R65-R80-R100-Differential-Shaft-Seal-33121241938-/171096634233?pt=Motorcycles_Parts_Accessories&hash=item27d6277379&vxp=mtr

Thanks tons!

    

19Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Tue Oct 29, 2013 6:40 pm

duck

duck
Life time member
Life time member


__________________________________________________
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
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

20Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Tue Oct 29, 2013 6:53 pm

snowbeard

snowbeard
Silver member
Silver member
Oh!! that's a great resource, didn't realize I could do that!! leak on final drive? 22936

    

21Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Tue Oct 29, 2013 9:47 pm

charlie99

charlie99
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bit expensive

I got one out here for $15.00

non genuine


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Oleak on final drive? Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

22Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Tue Oct 29, 2013 11:14 pm

RicK G

RicK G
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That one is a directional seal and for $15 I will bet my leftie that yours wasn't.


__________________________________________________
"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
    

23Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Tue Oct 29, 2013 11:40 pm

snowbeard

snowbeard
Silver member
Silver member
rick, are you talking to Charlie or me?  is this one I linked to good?

thanks!

    

24Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Tue Oct 29, 2013 11:52 pm

RicK G

RicK G
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Sorry mate, the one you show is the best to use as the cheaper seal won't have the directional serations on it.
If you look at the picture of the seal you listed you will see on the inner lip serations that go counterclockwise to the inside that helps keep the oil away from the seal lip so it doesn't have as much to deal with.
The $15 one Charlie fitted would do the job but probably wouldnt last as long and that was what I was betting my leftie on (safe bet considering it aint worth much nowdays).


__________________________________________________
"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
    

25Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Wed Oct 30, 2013 12:24 am

snowbeard

snowbeard
Silver member
Silver member
cool, thanks for the clarification!

As I always say "I'd give my right arm to be ambidextrous"  Cool

    

26Back to top Go down   leak on final drive? Empty Re: leak on final drive? on Wed Oct 30, 2013 12:49 am

RicK G

RicK G
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leak on final drive? 44271


__________________________________________________
"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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