BMW K bikes (Bricks)

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arbalest

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I have been in the middle of my sidecar project for three years. It will finally be completed this season. The bike has about 50k absolutely trouble free miles. It has started leaking oil from the weep hole at the front of the pan. I have read that that indicates an oil pump problem. I had no leaks before the start of the sidecar project. The leak started while the bike was not being ridden. What are my possible issues, before I start dismantling things?

arbalest

    

92KK 84WW Olaf

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It sounds like the old oil/water pump problem. I had mine done last year. Same thing.

For what its worth there was a change in the impeller from a nut fixing to a bolt. Chances are the shaft etc is all kaput and for my money I would go the complete replacement shaft/seals/impeller kit and be done with it. The replacement parts are an upgrade from the original. Its a little tricky for a novice as the seals are fragile but its a diy job for anyone with good skills but must be done very carefully.

Edit: Mine also is 84 build date. Just go for the complete shaft/seals/impeller kit. When mine was opened up the shaft was not good.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

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

RicK G

RicK G
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If it started leaking while the bike was not being used then there is a 99% chance the shaft is rusted beyond repair
Remove the front cover then the whole pump, it probably has the old style shaft which means replacement would have been necessary regardless of condition as the threaded part fatigues and breaks as soon as you try to undo the nut.

Most dealers have a kit to repair the pump which isn't very expensive but you will need to buy a new shaft with the gear attached or a good engineering shop can make a shaft and use the old gear.
Used pumps from fleabay and the like usually are in a similar state to yours and usually aren't worth using.


__________________________________________________
"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
    

92KK 84WW Olaf

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Sound advice Rick. Anything less is really a short cut.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

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

5Back to top Go down   oil leak, 85 K100RS, late 84 build date Empty oil leak Wed Mar 25, 2015 11:58 am

arbalest

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Thanks for the advice. I will check with my local dealer for the rebuild kit.

arbalest

    

Dai

Dai
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If the impeller comes out looking like a big cone/ball of rust you may have the very early type that looks like the impeller from the bottom of an old Hotpoint Twin Tub washing machine. Don't bother trying to clean it up - give Motorworks a call and ask them to send you the later type (secondhand). They charged me £4 for mine. The overhaul kit contains the fittings for both types.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

7Back to top Go down   oil leak, 85 K100RS, late 84 build date Empty Same oil leak on K75 Thu Mar 26, 2015 11:38 am

bkhK75

bkhK75
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My 1992 K75 just started leaking a small amount of oil from I think the same place.  It started suddenly a couple of days ago.  The bike has not been sitting and has a little over 45K miles on it.  I would like to confirm that my fix is the same?  The hole it leaks from:  is this a vent or just a weep hole to tell when your pump is wearing out or is there another purpose for it?  doesn't matter but I would just like to know what it is for.
Thank you.

    

RicK G

RicK G
admin
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It serves both purposes.


__________________________________________________
"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
    

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