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1Back to top Go down   K100RS Final Drive Mystery Empty K100RS Final Drive Mystery on Tue Nov 04, 2014 1:21 am

brickrider

brickrider
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Upon changing the oil in the 1985 K100RS' final drive, I learned there has been water intrusion.  I can't for the life of me understand how/when.
As an airhead rider for decades, I'm well aware of the need to avoid high pressure water streams near the final drive vent on the top of the case.  I always managed that without any problem on my airhead BMWs. 
When I first acquired this motorcycle I changed all the fluids (among other things) and found nothing amiss.  Now, about 12K miles later, the contents of the final drive looked like coffee with a healthy shot of milk.
I live and ride in an arid environment.  In fact, I don't recall ever riding that bike in rain.  During the few times I washed it, I was careful with the hose, yet there was water where it never should be. Can anyone offer an idea that would explain this?  Are the vents on K100 final drives defective Question

    

2Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Tue Nov 04, 2014 2:37 am

RicK G

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There was something about changing the vents on the drives but I cant find anything about it at the moment.
Ingeapedia will know more.


__________________________________________________
"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
    

3Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Tue Nov 04, 2014 3:57 am

charlie99

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yes ingepadia was one the ball when  a similar problem occurred

from memory there was a change ....and to be certain that the breather hole faced the back from memory ...

I also experienced similar things on one occasion ...and it wasn't when we went through a totally submerged creek crossing ...after an oil change from memory and possibly the breather had rotated around ...and a wash or two .????


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OK100RS Final Drive Mystery 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 ..
    

4Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Tue Nov 04, 2014 4:50 pm

Inge K.

Inge K.
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The change was late -84, so your -85 should be OK regarding this mod.
...unless your one is from the very early production that model year.

As Charlie says, check that the breather hole facing backwards.............
and that the o-ring in the bottom of the breather is undamaged.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

5Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Tue Nov 04, 2014 5:30 pm

92KK 84WW Olaf

92KK 84WW Olaf
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Must check mine but don't see any vent. No water in it either!!


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 103,800 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles
    

6Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Thu Nov 06, 2014 5:16 pm

brickrider

brickrider
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I had a look at the final drive case on my 1985 K100RS.  I'm none the wiser for having done that.  What I assume to be the vent on the top of the case is simply a plastic cap/cylinder affair.  It's not clear which direction it is facing because there is no opening and all the surface is the same. 
It's completely different from the old, air cooled BMWs that I know well.

    

7Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Fri Nov 07, 2014 12:12 am

Inge K.

Inge K.
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@brickrider wrote:  It's not clear which direction it is facing because there is no opening and all the surface is the same. 

Remove the breather from the FD...pull straight up...or use a couple of
screwdrivers and push from the bottom.

Drill a 3mm hole 6,5mm up from the bottom, put a o-ring of suitable size at the
metal sleeve on the FD to close the bottom of the breather before you push the
breather back home.

The genuine o-ring have part # 33 11 1 454 506.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

8Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Fri Nov 07, 2014 3:15 am

blaKey

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This is what my breather looks like (the black thing on top of the FD)...facing the wrong way, as pointed out by Inge. The hole should be facing the rear of the bike.

K100RS Final Drive Mystery Sany1129


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

9Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Fri Nov 07, 2014 3:01 pm

brickrider

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As suggested, I pried the black cap up and off the breather tube on the final drive housing.  The cap had no hole.  It now has a 3mm hole.  There was no o-ring to be found there, so I'm off in search of that.  My first stop will be a shop that sells all sizes; if they cannot help me, then I'll go to BMW, wallet in hand Rolling Eyes 
Upon examination of the vent, I don't really understand why the o-ring should be needed. If water should enter the small hole in the cap, it could seep out the understand of the plastic cap if no o-ring is present.  However, if the o-ring is present - and a snug fit - that wouldn't be possible and the only exit would be down the vent tube into the FD case. Of course, his scenario assumes the hole in the cap is not oriented to the rear.
But, what do I know about K-bikes?  I'll fit an o-ring, as suggested by the expert(s)!
Thank you for heading me in the right direction.

    

10Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Fri Nov 07, 2014 4:28 pm

Inge K.

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@brickrider wrote:
Upon examination of the vent, I don't really understand why the o-ring should be needed. If water should enter the small hole in the cap, it could seep out the understand of the plastic cap if no o-ring is present.

The o-ring is mounted to prevent the water from entering the bottom of the cap
and being pressed up between the sleeve and the cap and into the FD.

K100RS Final Drive Mystery Lufteh10


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

11Back to top Go down   K100RS Final Drive Mystery Empty Re: K100RS Final Drive Mystery on Fri Nov 07, 2014 4:38 pm

brickrider

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Okay, I understand.
I found an o-ring of the appropriate size, fitted it and now all looks good. I hope this ends my concerns of water mixing with the oil in the FD.
Thank you for your help.
My K100RS is now essentially ready to bed down for the duration of the winter.  During the cold months I'll rely on the wonderful fairing on my R100RS to keep me relatively comfy until Spring, 2015.

    

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