BMW K bikes (Bricks)

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1Back to top Go down    Water/oil pump replacment on Mon Jun 04, 2018 11:40 am

dakelvinator

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Silver member
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Hi Again! 
            Next job i was planning is replacing the oil/water pump on my 1990 K100. So just wanted to know how difficult is this? i was planning on getting a reconditioned one from Motor Works. Any tips how to guides out their? info on Gaskets ect? anything else worth doing on the cooling system while i am in their? Recommendations on coolant? Thanks in advance K.

    

2Back to top Go down    Re: Water/oil pump replacment on Mon Jun 04, 2018 12:25 pm

duck

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Look on YouTube. There's a K1100LT water pump video.

Any coolant should be fine.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down    Re: Water/oil pump replacment on Sun Jun 24, 2018 1:53 am

nobbylon

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It is a very simple job to replace the pump on a K. Empty the coolant by pulling the hose off the pump, remove the front cover and sensor wire connector, remove main body bolts and pull the pump off.
Replace in reverse using Permatex Ultra blue or black RTV sealer. I tried other sealers like hylomar etc but it always leaked. Flush the coolant from the old system and fill with a bike specific coolant (pink) for alloiy engine block. Takes approx 3 litres.
If you want a cheaper option then rebuild your own pump with new seals if the gear shaft is in good shape. 
Did the oil get contaminated with coolant? If so do an engine flush as I did with 1.75 litres 20w50 and 2 litres of Dex ATF fluid mix. Put bike on stand and run at 3000 rpm for 20 mins then drain, fit a new filter and refill with fresh 20w50. You’ll be amazed how clean the oil is now! 
I also pulled the sump off of mine which is also just taking a few bolts off. Very easy job.


__________________________________________________
K100RS July 1989
K100 Dec 1983 
R90s June 1975
R75/6 Feb 1976
F650GD May 2001
    

4Back to top Go down    Re: Water/oil pump replacment on Sun Jun 24, 2018 2:06 am

nobbylon

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__________________________________________________
K100RS July 1989
K100 Dec 1983 
R90s June 1975
R75/6 Feb 1976
F650GD May 2001
    

5Back to top Go down    Re: Water/oil pump replacment on Sat Jun 30, 2018 12:22 pm

dakelvinator

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Thanks for that nobbylon I will flush it as well!

    

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