BMW K bikes (Bricks)

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jumpinjimmy

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Title says it all really. I topped up my transmission with gear oil and used the special tool for measuring the level and put it exactly up to the line and went for a drive. Suddenly gear oil is leaking from the top of the transmission and on to the exhaust. What went wrong??

I know I didn't overfill (at least I didn't add any more than prescribed by the little measuring tool) and have changed the oil over the years without this issue.

ps. 1985 k100RS

    

RicK G

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There is most likely a split in the rubber boot around the clutch pushrod at the back of the gearbox.
BMW Part No. 23 13 1 338 731 It is accessible without removal of the swingarm but is a bit fiddly to get on.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

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

Dai

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As Rick says. However, before cursing the fact that you don't have four hands, gently try the clutch arm pivot to see if it will come out. If it will, then you might want to try the following:-

Unbolt the exhaust silencer from the footpeg hanger - don't take the system off!!
Hang enough weight off the back end to open up a big enough gap to slide the clutch arm pivot out (it took 21 lbs last time I did it!)
Slide the pivot out, drop the clutch arm off and remove the old boot
Keep the worm drive (unless you've got a new one)!!!
This is the damn awkward bit and you'll need to get under the bike...
Slide the pivot back in so that it's hanging in the gearbox casting
Put the boot and spring on the back of the clutch arm, reattach the clutch cable and hold the assembly up to the gearbox with one hand
Slide the pivot back into the clutch arm with the other - chances are it's just out of reach so I used a mallet

If you get this far, you've beaten the job.


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

Point-Seven-five

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You say the top of the transmission. Is the gear oil puddling around the breather?


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

kioolt

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I've seen before on some forum where someone topped up their transmission after improperly using the measuring tool. The tool should be inserted all the way down to the bend on the tool. If you just stick it in until it seems to stop you may not have inserted it far enough. In my experience with over 400k miles of owning BMW bikes the transmission does not need to to topped off ever.


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2004 R1150RT 186,800 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

92KK 84WW Olaf

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The only times I had to top mine up was when the clutch boot was leaking. If it isn't leaking then you shouldn't be losing any. Although.......when I was doing the recent rear seal job my drive shaft was very well oiled from somewhere.......


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 82,200 miles
    

92KK 84WW Olaf

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Little question too...no chance you used a power washer up the rear and got water in the transmission? In which case drain and change the oil and see what happens.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 82,200 miles
    

jumpinjimmy

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WELL, if it's supposed to be inserted to the bend of the tool then I have put way too much oil in the transmission. I wasn't able to insert the tool very far so that could be the problem. Not sure how it's supposed to go all the way to the bend though. Anyway, I'll drain out the fluid and put back exactly 850cc and see if I have leaks.

    

kioolt

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When inserting the measuring tool if it stops before the bend in the handle is against the filler hole you need to wiggle it to get past what it is hung up on. You may also need to raise and reinsert it.


__________________________________________________
2004 R1150RT 186,800 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

jumpinjimmy

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Thanks so much Kiollt! That solved the issue. I drained out the transmission and there was too much oil. I wasn't measuring correctly. All it took was a year to forget how to do that little job. duh.

    

kioolt

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Now that you know how far the measuring tool should be inserted where you able to insert it the full way? Just want to know.


__________________________________________________
2004 R1150RT 186,800 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total422,400 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

jumpinjimmy

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yes. I had already drain the transmission and then poured in 850cc and it measured just right. Thanks for rattling my brain.

    

Born Again Eccentric

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Great to hear that it was nothing more than a "miscalculation" and the honest admission of the mistake is refreshing. I suspect many might have taken the advice, checked, realised and then kept quiet. Good onya.

I always use a graduated measuring flask for getting the right amount of fluid in the right place - be it gear oil, fork oil or final drive oil...but then check using the tool or other device. The final drive is even more finicky to set the right level and any over fill will head straight in the direction of the rear brake disc.


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Paul

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurancewrite-off rebuild Feb 17
"Donor" K100LT 1990 (Red) (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike). June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

92KK 84WW Olaf

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@jumpinjimmy wrote:yes. I had already drain the transmission and then poured in 850cc and it measured just right. Thanks for rattling my brain.

88 and myself will be staying down at St Leon sur Vezere in September.

Since this is only a short run south west from you coffee at La Marjolaine in Plazacor lunch over at Roque de St Christophe should be on the cards oneof the days we are there. Or bring a tent along for one off the nightly bbqs at the camp site.....We have a bbq up at BobTs house.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 82,200 miles
    

jumpinjimmy

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sounds fun!

    

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