BMW K bikes (Bricks)

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1Back to top Go down   Oil leakage. Empty Oil leakage. Sun May 08, 2016 8:32 am


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Silver member
In an attempt to affect a temporary repair I have applied an exhaust cement to a broken exhaust. The instructions said to leave the bike idle for 20 minutes after application, now I know this is not generally recommended for K's but since I only plan for it to be a one off what could possibly go wrong...????

Well returning to the bike after 12-15 minutes there is a puddle of oil under the bike, dripping from the exhaust collector box. Switched off engine and leaking stopped.

From my limited knowledge/experience I suspect it is gearbox oil. Can anyone offer a possible explanation is to what happened and maybe why?


2Back to top Go down   Oil leakage. Empty Re: Oil leakage. Sun May 08, 2016 11:38 am

92KK 84WW Olaf

Life time member
Life time member
Dripping out from the exhaust collector box...

Condensation inside the exhaust, dripping out. we used to get that badly on the old Honda 4s, ticking over the drain hole would be dripping for quite a while because on tickover the exhaust silencer itself does not get very warm and ends up full of condensation. Smells fairly crap.

From the exhaust collector box the only way in, [assuming its coming out from it and not off it] is via combustion. When you fire up a K that's been idle for a while its burning all sorts of stuff including some oil and it all condenses inside the silencer. Add some pre existing condensation and that Holts stuff you are using then it may well all be harmless.

If the oil is coming off the collector box check the top side of the engine. I am not familiar with how the 16V exhaust is configured but one possibility might be the crank case very pipe but you would see that on top of the engine around the coils. That would be engine rather than gearbox oil. Other would be coming from rear of gear box but I don't know enough about 16V.

1992 K100LT 0193214 Bertha 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 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 45,920 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500

3Back to top Go down   Oil leakage. Empty Re: Oil leakage. Sun May 08, 2016 8:05 pm


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Life time member
Is the oil dark or light(clear)?
Was the engine running on the centre stand or the sidestand?


1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 Oil leakage. Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90

4Back to top Go down   Oil leakage. Empty Re: Oil leakage. Mon May 09, 2016 6:44 am


Life time member
Life time member
Is it dripping from the gear lever? Gearbox oil really stinks compared to engine oil, so you would be able to pick the difference

Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.

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