BMW K bikes (Bricks)

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1Back to top Go down    coolant flushing on Sun Aug 14, 2011 4:02 am

twincarb

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Morning all,



I had a look last night for where to drain the coolant the Haynes book says there is a plug on the Water/Oil pump, I had a look but cant see one, I am pretty certain i am looking in the right place. The water/oil pump is located at the front bottom of the engine block?

    

2Back to top Go down    Re: coolant flushing on Sun Aug 14, 2011 4:09 am

pjjms


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If I recall correctly the drain plug is under the LH side of the water pump. Round head with a hex for an allen key in the middle. There will be a temp sensor next to it and another larger hole in the casting with nothing in it. And yes, right on the front of the engine behind the front wheel.

    

3Back to top Go down    Re: coolant flushing on Sun Aug 14, 2011 4:44 am

ReneZ

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Seeing the bike you have I think it was fitted out with a coolingwater temp gauge. The sensor for the gauge was fitted in the drain plug opening and is the forward one on the pump (the aft one is the oil pressure switch).


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Greetings from Florida! Having a 'new' K :cyclops: Surprised-o:

Rene


BMW K100 - 1985 (0030029)
BMW K1200GT - 2003 (ZK01223)
    

4Back to top Go down    Re: coolant flushing on Sun Aug 14, 2011 6:21 am

twincarb

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ReneZ thanks that makes sense, I have got the LT and where I was expecting the Drain plug to be there is a sensor of sorts, I will have a look shortly to see if it just unwinds and shows me the blue stuff......


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BMW K100LT 1988 Matt Black Peugeot Electra Blue (ELX) Colour is now confirmed...
Yamaha Thundercat
Triumph Spitfire (not a bike but hell it's British chaps)
    

5Back to top Go down    Re: coolant flushing on Sat Sep 20, 2014 8:56 pm

BarryM

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I had the same problem this morning when I went to drain the coolant on my K1100LT, so I need to pop this boot off, remove the sensor and unscrew the drain bolt circled?


    

6Back to top Go down    Re: coolant flushing on Sat Sep 20, 2014 10:32 pm

ReneZ

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Just unscrew the jubilee clip and pull the hose on the right side off the pump.


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Greetings from Florida! Having a 'new' K :cyclops: Surprised-o:

Rene


BMW K100 - 1985 (0030029)
BMW K1200GT - 2003 (ZK01223)
    

7Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 4:07 am

BarryM

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Why would I undo a jubilee clip and pull off a hose if the drain plug is that easy to get to?

Unless you're saying that bolt isn't the drain plug....

    

8Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 5:31 am

blaKey

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For what it's worth...I agree with Renee.

Undo the hose clamp. It's there staring you in the face. Takes mere seconds.


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Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

Remember Rule No. 6
    

9Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 5:59 am

Mossy1200

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@BarryM wrote:I had the same problem this morning when I went to drain the coolant on my K1100LT, so I need to pop this boot off, remove the sensor and unscrew the drain bolt circled?



Im not sure your allowed to post dirty pictures.
I could be wrong.

    

10Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 6:43 am

Dai

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That is the temperature sensor/drain bolt but I'm with everyone else here: undo the worm drive and pull the hose off the side of the water pump. Drain time is a few seconds as opposed to many minutes if you pull the temp. sensor. I can give you two other reasons for going this route:

1. There should be a sealing washer under the temp.sensor. Do you have a new one?
2. The spigot that the hose pushes on to can corrode. Pulling the hose will let you clean the spigot and check how bad it is (if there's any damage at all).

OTOH you can always do both! Smile


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

11Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 7:00 am

RicK G

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I would be inclined to remove the hose to drain the system because the thread on the plug/sender is a fine thread and as such can be very easy to damage when tightening the plug. I would not be the one trying to fix the thread because I don't think helicoils are available in that fine thread size so you would need to go up one size and have no temp gauge or get a new/good pump housing.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

12Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 10:07 am

Inge K.

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@Dai wrote:
1. There should be a sealing washer under the temp.sensor. Do you have a new one?
A sealing washer isn't used together with the sensor, the sensor have tapered threads.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

13Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 11:32 am

BarryM

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Well it looks like I'm outnumbered so will take the forum advice, after all that's one of the reasons why I posted Smile

The spigot does indeed have a lot of crud around it and under where the hose attaches but it's not been leaking, fingers crossed there are no leaks after I clean it up and tighten the old hose.

Thanks for all the suggestions.

    

14Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 12:38 pm

charlie99

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@Mossy1200 wrote:
@BarryM wrote:I had the same problem this morning when I went to drain the coolant on my K1100LT, so I need to pop this boot off, remove the sensor and unscrew the drain bolt circled?



Im not sure your allowed to post dirty pictures.
I could be wrong.

ha !!!!

a good k is one that is ridden a lot .... but we appreciate them all


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

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15Back to top Go down    Re: coolant flushing on Sun Sep 21, 2014 1:18 pm

BarryM

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I'm afraid my K has been rather unloved for too many years but has performed a sterling job, I'm now trying to redress the balance by giving it the tlc it deserves Embarassed

    

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