BMW K bikes (Bricks)

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1Back to top Go down    Who knows What This Is Please! on Fri Dec 23, 2016 5:48 am

ditcha

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High new on here after some of your great knowledge!

I purchased my 87 K100 LT partly stripped from a guy so I am trying to pick up the pieces, there is what I believe to be a small sensor with 2 wires of some kind on the water pump where I believe the drain plug should be could identify this for me? do I need it as the wire go nowhere could i just replace with a drain plug?

Thanks
Dave

    

2Back to top Go down    Re: Who knows What This Is Please! on Fri Dec 23, 2016 6:09 am

AL-58

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There should be 2 sensors on the water/oil pump. One is for the oil pressure, the other is a water temp sensor. Each sensor takes one wire only. There is no drain plug.

Al


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'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (an ongoing renovation project, registered and on the road with original patina)

'87 K100RT with Paralever backend

"money cannot buy happiness, but it can buy another K and that's the same thing"

    

3Back to top Go down    Re: Who knows What This Is Please! on Fri Dec 23, 2016 6:48 am

ditcha

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Hi Al thanks much appreciated which one is the oil pressure and which one the water temperature am i right in thinking the larger one of the two is the oil? The smaller one the two wires are not joined to anything she started okay like this

    

4Back to top Go down    Re: Who knows What This Is Please! on Fri Dec 23, 2016 6:55 am

Dai

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Brown/green is the oil pressure switch and violet/black is the temperature sensor. Give what you think is a drain plug a good clean; I'm guessing that the terminal post has rotted away and cleaning it should either show up a green gungy mess or a shiny brass bit in the middle. If this is the case, Motorworks are your friend (if they aren't already!).


__________________________________________________
'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)
    

5Back to top Go down    Re: Who knows What This Is Please! on Fri Dec 23, 2016 9:06 am

ditcha

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Cheers Dai must be temp sensor it seems to have like a hard crud / bodge type material stuck around it I will give it a clean at see what's what thanks, do you know where the other end is terminated?

Thanks
Dave

    

6Back to top Go down    Re: Who knows What This Is Please! on Sat Dec 24, 2016 10:31 am

Dai

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Somewhere in the main wiring loom. I do recall that the oil pressure sensor lead is a single-pin connector under the right-forward side of the fuel tank... mmm... I think the temperature lead has a single-pin connector there too. Don't think about running new wires yet - to do that you'll need to remove the front T-cover (over the Hall-effect sensors (ignition pickups)) and they can be a complete bastard to thread.


__________________________________________________
'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)
    

7Back to top Go down    Re: Who knows What This Is Please! on Sat Dec 24, 2016 1:34 pm

ditcha

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Cheers, the smaller temp sensor wires just run up the side of the engine cable tied to the hoses then the air intake then just stop there I intend to do a full strip down to paint casing etc so hopefully with find the connection then

    

8Back to top Go down    Re: Who knows What This Is Please! on Sat Dec 24, 2016 10:37 pm

td5

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If you have to thread it, use a broken clutch cable if you have one as it is perfect to thread in then tie the wire to it and pull. Cheers Mike


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1988 / K100RS
2003 / R1150R
2003 / K1200RS
    

9Back to top Go down    Re: Who knows What This Is Please! on Mon Dec 26, 2016 2:42 am

Holister

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@ditcha wrote:Cheers Dai must be temp sensor it seems to have like a hard crud / bodge type material stuck around it I will give it a clean at see what's what thanks, do you know where the other end is terminated?

Thanks
Dave
The coolant temp sensor wire should enter the cavity in the pump housing thru a small finger sized hole just a few cm to the side of the sensor. It then finds its way thru a cavity in the timing chain cover and emerges behind the the T-shaped timing cover at the bottom. Threading it thru that route requires a little patience (good tip from td5). It then follows the HES wiring up the R/H forward frame strut EDITand connects into the fuel injection harness at a connector under the tank. (#6 - See the diagram below which is on the Trouble shooting page linked off the Portal tab. Note: the diagram is upside-down. The front is at the bottom so connector #6 is on the left as you sit on the bike)

EDIT: That wire could also possibly be the oil pressure sensor.



Last edited by Holister on Wed Dec 28, 2016 12:48 am; edited 1 time in total (Reason for editing : incorrect information due to too much beer and JD on Boxing Day)


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

10Back to top Go down    Re: Who knows What This Is Please! on Mon Dec 26, 2016 7:31 pm

Dai

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Thanks for following that up Holister. Some of us were working unexpectedly - on Christmas Day, dammit. Alright, it didn't really matter because my wife was working also. Chrissy dinner was had today instead.


__________________________________________________
'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: Who knows What This Is Please! on Wed Dec 28, 2016 1:13 am

Holister

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Glad you eventually managed to get your Christmas dinner Dai. santa

I've corrected my post above. Too much beer and JD on Boxing Day drunken . The wiring from the water pump sensors finds its way up to the under tank connections but doesn't connect with the fuel injection harness connector.... that's the wire from the coolant sensor just below the radiator. Cheers


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

12Back to top Go down    Re: Who knows What This Is Please! on Wed Dec 28, 2016 2:03 pm

Laitch

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@AL-58 wrote:There should be 2 sensors on the water/oil pump. . . . There is no drain plug.
There is a drain screw though.Laughing


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1995 K75T 60,000 miles
    

13Back to top Go down    Re: Who knows What This Is Please! on Wed Dec 28, 2016 8:49 pm

Dai

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Drain screw? Ignore it - pull the hose off and stand back. Shocked 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    Re: Who knows What This Is Please! on Mon Jan 09, 2017 1:23 pm

Bumblebee

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@Dai wrote:Drain screw? Ignore it - pull the hose off and stand back. Shocked Very Happy

Coolant Coolant everywhere! What an unholy mess!

I like the drain plug, much neater. Bumblebee likes neat when working on the bike.
Just undo the radiator cap before you drain.

- John

http://Bugsmashers.org/phpbb
    

15Back to top Go down    Re: Who knows What This Is Please! on Wed Jan 11, 2017 8:08 pm

japuentes

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@Laitch wrote:
@AL-58 wrote:There should be 2 sensors on the water/oil pump. . . . There is no drain plug.
There is a drain screw though.Laughing
Hi there, the original design had drain but no coolant temp indicator, so BMW put the temp indicator sensor in the drain hole.
So if want to keep the sensor and not risking damaging it, go for the hose removal method and clean the mess
Best regards
JAP


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1988 K100RS SE/ABS
    

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