BMW K bikes (Bricks)

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1Back to top Go down    oil/water pump.... on Wed May 18, 2016 9:22 pm

SniperX

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Are they a Twp part bit? Like oil water pump sandwiched together? If so, since it looks like mine is leaking oil, how much of a pain is it to change the seals? And what do I need to do as well as seals?


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1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

2Back to top Go down    Re: oil/water pump.... on Wed May 18, 2016 9:51 pm

92KK 84WW Olaf

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85RT is likely to have the 'old' impeller and nut arrangement. It is a single shaft that functions for both oil and coolant. The usual tell tale is the drip at the front of the engine.

Apart from the seals the impeller is likely to be gone, the nut arrangement inevitably breaks off and anyway the shaft is likely to be worn or pitted. When I got mine done it was a case of new shaft, impeller and seals. The shaft and impeller were modified by BMW and you will be getting the modified version where the impeller is bolted on.

Its a tricky job as there is a ceramic seal that is easily damaged so you need to be careful putting it all together. There are some excellent threads on doing the job.


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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 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

3Back to top Go down    Re: oil/water pump.... on Wed May 18, 2016 10:57 pm

SniperX

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It's not leaking coolant. I thought it was leaking oil but I am pretty sure it is not oil from the pump but from the old timing case cover.


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1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

4Back to top Go down    Re: oil/water pump.... on Wed May 18, 2016 10:58 pm

RicK G

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They are the one unit with the oil pump behind the water pump. The usual drain the water and remove at least 1 litre of oil before removing the pump.
Remove the nut holding the impeller, it may break off which will mean a new shaft around, 100quid, then press the shaft out remove the water seal then the oil seal noting which way round it goes. Inspect the shaft which will probably be pitted but check the area where the seal runs it is often OK.
You will probably need a new shaft and definately a seal kit. you can use a new impeller or machine 3mm off the boss of the old cast impeller and use it.


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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
    

5Back to top Go down    Re: oil/water pump.... on Thu May 19, 2016 12:49 am

blaKey

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"I thought it was leaking oil but I am pretty sure it is not oil from the pump but from the old timing case cover."

Degrease the whole area, go for a ride and see if you can spot where the oil is coming from...as a suggestion.


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

6Back to top Go down    Re: oil/water pump.... on Thu May 19, 2016 6:25 am

TacKler

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What Mr. Blakey said- degrease the whole area and watch for the pattern of the oil splatter. The airflow over the engine does odd things with oil as you ride along.

Are you getting oil on your left boot? If so it could be the camshaft cover leaking at the front where it joins the timing chain cover on the LHS. There is a bit of a mismatch where they join and there are specific instructions in the Haynes manual stating to apply sealant where they join when refitting the camshaft cover.


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Red 1991 K75S
    

7Back to top Go down    Re: oil/water pump.... on Thu May 19, 2016 11:20 am

88

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+1 on tackler's comment about oil on the right boot. The oil pressure sensor in the oil/water pump is another culprit for oily mess in the pump area.


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88....May contain nuts!

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

8Back to top Go down    Re: oil/water pump.... on Thu May 19, 2016 3:36 pm

SniperX

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@88 wrote:+1 on tackler's comment about oil on the right boot. The oil pressure sensor in the oil/water pump is another culprit for oily mess in the pump area.
Funny that, same way I knew my push rod seals were leaking on my 77 R100rs!


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1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

9Back to top Go down    Re: oil/water pump.... on Wed May 25, 2016 3:49 pm

SniperX

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Turns out it was the timing cover before I did all the work, it's all dry now.


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1972 BMW 3.0CSL, 1985 BMW Dinan 535i, 2001 Honda XR400R (plated), 1985 K100RT, 2004 ZX3 Focus, 1991 Dodge Power Wagon 4x4. 1977 Plymouth Trailduster 35K original miles!
    

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