BMW K bikes (Bricks)

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1Back to top Go down   Water temp. 1985 k100 Empty Water temp. 1985 k100 on Sun Jan 13, 2019 11:08 am

timo27

timo27
Silver member
Silver member
Hi all its been a while, i have just a quick question on aftermarket water temp. senders did i read (or did i dream about it ?) you could put a sender unit into the water pump drain plug hole??? if so what is the thread size i would need for the sender. many thanks Tim

    

2Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun Jan 13, 2019 11:15 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
You most definitely do not want to place a plug into the drain plug hole. You need a switch that threads into the second hole on the combined oil/water pump. Unscrew the Allen head plug sitting next to the oil pressure switch (12x1.5) and look at its threads (it measures 10x1.0). Another method is to look up the item in ETK because, as in this case, the dimensions are spelt out for you in the description, as is the correct part number. I use www.realoem.com. You don't mention a year or model so it's guesswork as to the exact bike you have there, tho' they're common to many models. I recommend placing this info in the signature section of your profile.

Here's a link to an 8V K100:

http://www.realoem.com/bmw/enUS/showparts?id=0503-EUR-11-1986-K589-BMW-K_100_RS_83_0502,0503,0513_&diagId=11_1818



Last edited by Two Wheels Better on Sun Jan 13, 2019 11:16 am; edited 1 time in total


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

3Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun Jan 13, 2019 11:15 am

duck

duck
Life time member
Life time member
Yes. 10x1.


__________________________________________________
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
    

4Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun Jan 13, 2019 11:24 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The BMW OEM sender has a flush face that does not extend into the coolant passage.  When I was looking for a non-BMW replacement it seemed that nearly every other sender had an extended probe that I was afraid would block flow or possibly contact the wall of the passage.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun Jan 13, 2019 2:17 pm

timo27

timo27
Silver member
Silver member
@Two Wheels Better wrote:You most definitely do not want to place a plug into the drain plug hole. You need a switch that threads into the second hole on the combined oil/water pump. Unscrew the Allen head plug sitting next to the oil pressure switch (12x1.5) and look at its threads (it measures 10x1.0). Another method is to look up the item in ETK because, as in this case, the dimensions are spelt out for you in the description, as is the correct part number. I use www.realoem.com. You don't mention a year or model so it's guesswork as to the exact bike you have there, tho' they're common to many models. I recommend placing this info in the signature section of your profile.

Here's a link to an 8V K100:

http://www.realoem.com/bmw/enUS/showparts?id=0503-EUR-11-1986-K589-BMW-K_100_RS_83_0502,0503,0513_&diagId=11_1818
Thanks for the info the age and model stated in the title

    

6Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Fri May 17, 2019 4:06 pm

timo27

timo27
Silver member
Silver member
The drain plug is the one next to the oil pressure? number 16

    

7Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Fri May 17, 2019 5:57 pm

Dai

Dai
Life time member
Life time member
Yes. As it happens, only last weekend I exchanged the drain plug for a temperature sensor on my K100.


__________________________________________________
'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)
    

8Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sat May 18, 2019 3:34 am

timo27

timo27
Silver member
Silver member
Thanks for that ? what length was the sender unit ie how far in did it go? can you restrict the flow?

    

9Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sat May 18, 2019 6:54 am

Dai

Dai
Life time member
Life time member
I used a s/h K1100 sensor from Motorworks. I didn't measure it but it looked to be about 15mm of thread. Give me a few hours and I'll pull it back out and measure it - I'm still working under the bike and there's no coolant in the ATM.


__________________________________________________
'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)
    

10Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sat May 18, 2019 7:32 am

timo27

timo27
Silver member
Silver member
thanks

    

11Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sat May 18, 2019 3:40 pm

Dai

Dai
Life time member
Life time member
The threaded portion on the sensor is 10mm long.


__________________________________________________
'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)
    

12Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sat May 18, 2019 3:52 pm

timo27

timo27
Silver member
Silver member
And the sensor bit without the thread ?

    

13Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sat May 18, 2019 5:07 pm

Dai

Dai
Life time member
Life time member
Makes no odds as it hangs down into thin air with nothing to foul, but it's 14mm AF and about 6mm high. Too lazy to go out there again Very Happy


__________________________________________________
'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)
    

14Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun May 19, 2019 1:23 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The OEM sensor has a flush face where the coolant contacts.  It seems that every aftermarket alternative has the probe extend from the threaded portion of the body into the coolant passage, obstructing the flow.  Because the cooling is marginal at best on these bikes, I am loathe to use anything other than the OEM sensor so as not to reduce the cooling efficiency(what there is of it).


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

15Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun May 19, 2019 1:30 pm

duck

duck
Life time member
Life time member
The temp sensor in the water pump has no impact on how the cooling system operates.  The thermostat and fan work the same whether you have a drain plug or a sensor in that hole.


__________________________________________________
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
    

16Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun May 19, 2019 3:32 pm

timo27

timo27
Silver member
Silver member
Thanks all Water temp. 1985 k100 TWater temp. 1985 k100 T
''has the probe extend from the threaded portion'' this is my only worry 
The length the probe enters the water pump, the one i have doesn't have a flush face.

    

17Back to top Go down   Water temp. 1985 k100 Empty Re: Water temp. 1985 k100 on Sun May 19, 2019 4:14 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
@timo27 wrote:Thanks all Water temp. 1985 k100 TWater temp. 1985 k100 T
''has the probe extend from the threaded portion'' this is my only worry 
The length the probe enters the water pump, the one i have doesn't have a flush face.
That was my concern when I was looking for a sensor.  There are lots of low cost sensors with the right temperature curve out there, but they all have large probes that extend into the coolant passage while the flush face of the OEM sensor doesn't.  I figured that the special to BMW configuration was necessary to prevent blocking the flow.  The extra 30 bucks for the BMW sensor was cheap insurance for peace of mind when riding around the deserts of New Mexico and Arizona in the summer heat.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

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