BMW K bikes (Bricks)

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1Back to top Go down   Overheating Empty Overheating Wed Jul 18, 2012 5:58 pm

Lucky Lou

Lucky Lou
active member
active member
Left the bike ticking over while chatting and after about 10 minutes it started spluttering water from the reservoir, either the Fans are not working or the senser or relay are Kaput. any thoughts where to look first and is there an easy way to check the fans?

Ta Lou

    

2Back to top Go down   Overheating Empty Re: Overheating Wed Jul 18, 2012 6:36 pm

sidecar paul

sidecar paul
Life time member
Life time member
Hi Lou,
I once had the reservoir overflowing and the cause was simply a split in the hose from the radiator cap to the reservoir.
When the coolant expands it flows freely down the hose into the res, but as it contracts the easier route is to suck air through the split in the hose, consequently the res overflows.
Maybe your problem as well and it's easy to check and cheap to fix.
Cheers,
Paul.


__________________________________________________
'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

3Back to top Go down   Overheating Empty Re: Overheating Wed Jul 18, 2012 6:38 pm

charlie99

charlie99
VIP
VIP
lou ...water going to the resevoir is quite normal as it reaches temperature ....but you better makesure that its full properly .....often there is air inside the system ...or not full up ......best way to check if the fan is actually able to rotate is to reach inside the right hand side fairing ....use a torch to confirm that the fan can actually turn by hand .......if it can..next would be to check the terminals at the connector to the fan (sorry lower fairing off) ...the connector is often found to be in need of cleaning ...we love "deoxit" for this type of maintenance .



hope that helps


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OOverheating Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

4Back to top Go down   Overheating Empty Re: Overheating Wed Jul 18, 2012 6:45 pm

Inge K.

Inge K.
VIP
VIP
Not unusal that the fan is seized, try to turn it with your finger.
Did the temp. warning light show?

If not, it`s a sensor or relay problem.

To check the sensor, remove the relay from its socket and measure the resistance between terminal E and 31.

Compare the result with the diagram temp vs. resistance in Bert`s troubleshooting guide at the portal.

After checked that the isn`t seized, you can check the fan itself and the wiring between the relay socket and the fan by bridging terminal 15 and A2 in the socket.


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

5Back to top Go down   Overheating Empty Re: Overheating Wed Jul 18, 2012 8:04 pm

krambo

krambo
Life time member
Life time member
At a guess I would say the most likely culprit is a seized radiator cooling fan - ask me how I know..... Wink


__________________________________________________
1984 BMW K100RT, 1993 BMW K1100LTIC,1982 Kawasaki KZ1100 Spectre
"Aut viam inveniam aut faciam." Overheating Uk-bmw12
http://www.its-personal.net
    

6Back to top Go down   Overheating Empty Re: Overheating Wed Jul 18, 2012 10:32 pm

RicK G

RicK G
admin
admin
5 Razoos says it's the fan.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

7Back to top Go down   Overheating Empty Re: Overheating Thu Jul 19, 2012 3:55 am

Lucky Lou

Lucky Lou
active member
active member
Thanks for the help, there was no warning light and the fans feel free... looks like the sensor is the problem but i will check the connections anyway

Lou

    

8Back to top Go down   Overheating Empty Re: Overheating Thu Jul 19, 2012 4:45 am

RicK G

RicK G
admin
admin
Check the brushes, there was one on here that was broken a while ago and I have a couple of spares and there is a busted brush on one of those.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

9Back to top Go down   Overheating Empty Re: Overheating Thu Jul 19, 2012 5:05 pm

ReneZ

ReneZ
Life time member
Life time member
What bike have you got Question


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

Rene


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

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