BMW K bikes (Bricks)

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1Back to top Go down    Water in cylinder - gasket/head? on Mon Aug 17, 2015 4:54 am


New member
New member
hi all - hope someone can help or point me in the right direction.
When Ipressed thestarter my bike (K100rs) the other week it just clicked and engine didn't turn over - thought strange as battery was fully charged - tried again and was fine. Took the bike out (to its MOT) and it was chucking white smoke out the back for a few miles and then temp gauge headed for the red.Sod's law, itpassed MOT ok
On chatting to a local bike mechanic he thought it sounded like water in cylinder, and I should remove plugs and turn it over - sure enough water spat out of cylinder no.3
I can't confirm whether antifreeze was in the system beforehand& am assuming gasket has gone or head/block cracked??
from what I have read on forum gaskets very rarely go?

So questions are please
1.assuming it's just thegasket- is this a big job on these ?
2. does anyone know of a k100 mechanic in south stockport/Manchester area - be good to have someone on the job whohas workedon these bikes if possible
3. could water get in from the injector seal?

any help /thoughts appreciated


2Back to top Go down    Re: Water in cylinder - gasket/head? on Wed Aug 19, 2015 4:20 am


Life time member
Life time member
I doubt its going to be "just the gasket". The head has probably warped from overheating causing the gasket to leak.
Not been in there myself but I'm sure there's someone here that can give you a heads-up on what's involved.

Won't have anything to do with the injectors. They're nowhere near the cooling system.

1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90

3Back to top Go down    Re: Water in cylinder - gasket/head? on Wed Aug 19, 2015 7:10 am

RicK G

If you have coolant in a cylinder then the head will have to come off. then you will find out for sure what is wrong.
Its not a real big job, about the same as any other DOHC engine and lots easier than in a car.

"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 & 1976 SR 500 Yamaha for now

4Back to top Go down    Re: Water in cylinder - gasket/head? on Wed Aug 19, 2015 8:08 am

92KK 84WW Olaf

Life time member
Life time member
Your post doesn't state the year or any engine information, as in age, 8 or 16 valve engine.

Very early K engines weren't set up for unleaded petrol, but seem to manage fine on it. Exhaust nuts studs are notorious for not coming off cleanly but with head off can easily be sorted.

Due to the engine configuration head off is a very accessible job.

Would it be worth having another known good head to go on instead, as in checked and ready to go on? Just a thought.

1992 K100LT 0193214 Alaska Blue 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Mystic Red 58,645 now 67,600 miles

5Back to top Go down    Re: Water in cylinder - gasket/head? on Wed Aug 26, 2015 11:15 am


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New member
thanks for the replies - head will haveto come off - i'll get local bike MOT place to have a look and see what they find.
Unless anyone knows of a K100 specialist in around south Manchester??

mine is a 1990 K100RS 16 valve


6Back to top Go down    Re: Water in cylinder - gasket/head? on Wed Aug 26, 2015 5:10 pm

Crazy Frog

The good thing about removing the head on a K100 is that yo can do it without removing the engine from the bike. It only takes a couple of hours.
If you have a minimum of mechanical skills and basic tools (+ a torque wrench), you can do that on your own and save a lot of money.
Just look at the Haynes or Clymer manual and see if you are up to the task.
You can always expect help from people on this forum.

1986 k75, 1985 K100rt, 1985 K100rt/EML sidecar.

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