BMW K bikes (Bricks)

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Tommy2305

Tommy2305
Silver member
Silver member
Hi guys 

I just installed a new seal at the final drive since it was leaking. But it still is leaking... Yes I mounted the seal correctly and the inner lip is not folded. 
The seal is not original, it is from tills.de and made out of viton and I have ordered a couple of seals made of viton with out any problem. 

Right now i need some different parts and I would like to place the whole order from tills.de. But should I go for an original seal instead? Tills.de only offers viton seals.

k100 final drive leak, with new output seal  Img_0011
k100 final drive leak, with new output seal  Img_0110


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BMW K100RT 1987 "cafe racer"
    

RicK G

RicK G
admin
admin
Is the surface the seal runs on flat and clean, that is not marked in any way or worn due to the old seal.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

Tommy2305

Tommy2305
Silver member
Silver member
@RicK G wrote:Is the surface the seal runs on flat and clean, that is not marked in any way or worn due to the old seal.
The surface did have some surface rust on it where the old seal did not cover, but I carefully scuffed off the surface rust with 600 grit. When I was almost down to the surface I carefully used 800 grit at last. I have experience with polishing from work and there are no scratches which should prevent it to seal tight.

I am able to get a thin piece of plastic under the outer lip on the seal, so I guess something is not right


__________________________________________________
BMW K100RT 1987 "cafe racer"
    

RicK G

RicK G
admin
admin
I would measure the diameter of the sealing surface and check the seal matches because that clearance is not right.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

Laitch

Laitch
Life time member
Life time member
@Tommy2305 wrote:The seal is not original, it is from tills.de . . .
Is the seal you purchased the one that is offered on this page I viewed today ?


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1995 K75 81,000 miles
k100 final drive leak, with new output seal  Usa-lo10
    

Tommy2305

Tommy2305
Silver member
Silver member
To measure the seal I have to pull the housing apart once again, would rather avoid that. Does the 8v and 16v bikes have different diameters? 

Yes the link you provide is the one I ordered and I'm considering ordering once more.

Is this the right measurements?:  85X110X10mm


(found on this website: https://www.mc-importen.dk/reservedele/article/630344/10106020300 )


__________________________________________________
BMW K100RT 1987 "cafe racer"
    

Laitch

Laitch
Life time member
Life time member
@Tommy2305 wrote:Does the 8v and 16v bikes have different diameters?
Yes the link you provide is the one I ordered and I'm considering ordering once more.
Is this the right measurements?:  85X110X10mm
The seal fits both 8V and 16V models. The dimension you give is the same as provided by MaxBMW's parts fiche in the USA. The part number at tills.de is the same as Max's. The coloration of the seal on the tills.de site differs from the color of the seal you are holding in the photograph. That might be a function of monitor color choice.

Where did you get information that the tills.de seal is Viton? Did you heat the cover before bolting it on?


__________________________________________________
1995 K75 81,000 miles
k100 final drive leak, with new output seal  Usa-lo10
    

gorio

gorio
Silver member
Silver member
This would appear to be the seal spec'd for most of the K-bikes.
Why not just try one form a local bearing shop?
Seal material shouldn't make any difference to the size

Shaft seal     85X110X10     1             33121241938

A word of caution, I have seldom found that seals fail without some other factor such as vibration from a bearing that is past it's best before date. So I have found it best to change the bearing and avoid re-visiting the seal in the near future.
Just my experiance


__________________________________________________
1992 K100rs 16v
1997 R1100rt
2006 R1200rt
Past lives
Kawasaki Concours
1976 BMW R90s
1975 Ducati 860gt
1992 Honda VFR750
1985 Honda VF750
1982 Kawasaki 750GPZ
1975 Norton 850 Commando
    

Tommy2305

Tommy2305
Silver member
Silver member
Well I read somewhere the seal should be viton, but actually it doesn't say in the product description, I might have made a mistake. The cover was heated slightly for easy fitment over the bearing, I could still touch it with my bare hands. 
The color was also brown on the seal I fitted, I guess it's just the light which makes it look black-ish. 
But good to hear it is the same diameter for 8v and 16v, that's what the description says.


The bearing seemed all right, and I might go down and check at the local bearing store, a actually knows someone who maybe can supply one with those measurements.


__________________________________________________
BMW K100RT 1987 "cafe racer"
    

gorio

gorio
Silver member
Silver member
Let us know how it all works out. I would love to know if there is a difference in dimensions of some of the seals. It would make the rest of us pay attention when purchasing new ones.

Unfortunately it has made extra work for you by the look of it.


__________________________________________________
1992 K100rs 16v
1997 R1100rt
2006 R1200rt
Past lives
Kawasaki Concours
1976 BMW R90s
1975 Ducati 860gt
1992 Honda VFR750
1985 Honda VF750
1982 Kawasaki 750GPZ
1975 Norton 850 Commando
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Can you confirm that there was a spring in the rear of the seal? In seals of that type, the inner lip holds the oil, while the outer lip keeps the dirt out. The spring forces the inner lip against the sealing surface.

It's also possible that the inner lip has been distorted when you assembled the housing. Can you take it apart to inspect the condition of the lip? Did it pick up a bit of dirt or was it distorted during assembly? A bit of Vaseline on the sealing surface before assembly helps the seal slide over the hub.

As far as I know, there is no dimensional difference in seals made with Viton vs. other materials. 85mm is 85mm regardless of what the seal material is.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Tommy2305

Tommy2305
Silver member
Silver member
Well I'm not able to measure the old seal since it folded when I pulled it out. It can measure what ever you want it to be.. Yes the spring sits as I should on the old seal, and I did lube the lip before installing. 
The make seems to be: Jago 85x110x10

I measured the new seal to be around 83.3mm around the inner lip, but this lip Is smooth without any riddles and it has no specific rotation. Also the outer lip is around 85.3 but it is really hard to measure since the rubber is very soft, but it seems big!
I bought it at the local transport industry store, with the measurements 85x110x10. A lot cheaper than oem! Unfortunately I did not have the time to fit the new seal today, I only had time to pull out the old one.

Another thing, is the hub supposed to measure 84.65mm??? affraid seems like a odd measurement, why not 85?



k100 final drive leak, with new output seal  Img_0112
k100 final drive leak, with new output seal  Img_0113
k100 final drive leak, with new output seal  Img_0111
k100 final drive leak, with new output seal  Img_0114
k100 final drive leak, with new output seal  Img_0116
k100 final drive leak, with new output seal  Img_0115


__________________________________________________
BMW K100RT 1987 "cafe racer"
    

Suzi Q

Suzi Q
Life time member
Life time member
Left field suggestion..
...but I have just stripped and cleaned a Mitutoyo digital vernier after discovering that it was reading off....and had been doing so for some time when it finally dawned on me  Shocked

- it still zeroed fine, but the reading 'missed' around half a millimeter near the 8mm point....


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Sometimes I'm not really Suzi Quatro.
    

Tommy2305

Tommy2305
Silver member
Silver member
This caliper is from work. I'm a toolmaker and it is calibrated 2 times a year and measures very precise, otherwise I'm not able to work Very Happy


__________________________________________________
BMW K100RT 1987 "cafe racer"
    

Suzi Q

Suzi Q
Life time member
Life time member
k100 final drive leak, with new output seal  112350


__________________________________________________
Sometimes I'm not really Suzi Quatro.
    

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