BMW K bikes (Bricks)

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tio Jaimito

tio Jaimito
Platinum member
Platinum member
Hello sKolars,
We have the old low mileage K100rs 1985. She runs great, mirror doesn't pop off at 110mph and bumps. Great starting, Acceleration, I just love the old girl. I have rebuilt the forks, rebuilt the oil/water pump (in two seals) which included a new impeller and shaft from dealer. Because of course my threaded shaft end snapped off. Two seals because I fouled the first one. But experience is bliss. She doesn't leak a drop. I used synthetic blend oil, 10-40 valvoline. Bla bla bla....
Oil light comes on after the engine heats up and in traffic if I run it with the choke half on it boosts the rpms to about 1100 an that takes care of it. So it is sensing low oil pressure. How can this be??? What did I booger up on my pump rebuild? Or might there be some other culprit? Hit me with your ideas please!
Uncle Jim.


__________________________________________________
Krazy Kat. 1985 K100RS Alaskablau 13000miles 8valve "Black Belly"

Peggy's 1987 K75s Columbia Grey 9500miles 6 valve.

Oil Pressure Light comes on at idle after it warms up K100_m12

Oil Pressure Light comes on at idle after it warms up K75_po12
Oil Pressure Light comes on at idle after it warms up Basil_10
http://www.nachicagonorth.com
    

japuentes

japuentes
Life time member
Life time member
Hi there, assuming the engine is ok, maybe something went amiss during the pump revamp and you are losing pressure or the pressure regulator lost the setpoint or the pressure sensor is gone.
You can begin checking the sensor by fitting a gauge at the pressure sensor port. If sensor is Ok then is time to go deeper.
Hope this help
Best regards
JAP


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Oil Pressure Light comes on at idle after it warms up 2854237993 1988 K100RS SE/ABS
    

charlie99

charlie99
VIP
VIP
uj i think jap is on to it

sounds like you have lost the oil pressure releif spring or something similar

is there a chance that the sealant has worked its way into the oil presure relif valve ...jamming it open ?

i think you can juggle the oil pressure releif valnve out whilst the pump is still attached to the bike ,,,,its basically a piston spring loaded

i think there is a allen head cap that undoes and visible just behind the radiator outlet ...pump inlet pipe 8 or 10 mm from the look of it breifly yesturday whilst fiddling about .

might pay to pull it off and clean up the internals ?


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OOil Pressure Light comes on at idle after it warms up 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 ..
    

tio Jaimito

tio Jaimito
Platinum member
Platinum member
@charlie99 wrote:uj i think jap is on to it

sounds like you have lost the oil pressure releif spring or something similar

is there a chance that the sealant has worked its way into the oil presure relif valve ...jamming it open ?

i think you can juggle the oil pressure releif valnve out whilst the pump is still attached to the bike ,,,,its basically a piston spring loaded

i think there is a allen head cap that undoes and visible just behind the radiator outlet ...pump inlet pipe 8 or 10 mm from the look of it breifly yesturday whilst fiddling about .

might pay to pull it off and clean up the internals ?
Thank you both for the quick response. Charlie, you mention that I may have gummed up the OP relief valve jamming it open.... So if I were to have jammed it open, at low speed it wouldn't allow enough pressure to build up. Makes total sense. Gracias tambien, Puentes. Coño, otravez pa' dentro la bomba. Chin


__________________________________________________
Krazy Kat. 1985 K100RS Alaskablau 13000miles 8valve "Black Belly"

Peggy's 1987 K75s Columbia Grey 9500miles 6 valve.

Oil Pressure Light comes on at idle after it warms up K100_m12

Oil Pressure Light comes on at idle after it warms up K75_po12
Oil Pressure Light comes on at idle after it warms up Basil_10
http://www.nachicagonorth.com
    

japuentes

japuentes
Life time member
Life time member
@tio Jaimito wrote:... Gracias tambien, Puentes. Coño, otravez pa' dentro la bomba. Chin
Bueno como dijo Arnold S* happens, y con suerte es solo un pegoste.
Saludos
JAP


__________________________________________________
Oil Pressure Light comes on at idle after it warms up 2854237993 1988 K100RS SE/ABS
    

RicK G

RicK G
VIP
VIP
I don't know what you are talking about, I only speak 2 languages. English when I am sober and I mumble in cohehently when I am drunk. Very Happy


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

japuentes

japuentes
Life time member
Life time member
@Rick G wrote:I don't know what you are talking about, I only speak 2 languages. English when I am sober and I mumble in cohehently when I am drunk. Very Happy
Try the google translator from drunk spanish to sobernglish cause right now I´m a little? drunk.
Best regards
JAP


__________________________________________________
Oil Pressure Light comes on at idle after it warms up 2854237993 1988 K100RS SE/ABS
    

Toto_jp

avatar
Platinum member
Platinum member
have you changed oil filter lately ? maybe faulty seal or filter not tight enough allowing pressure loss

could be just a faulty switch or bad earth
just a thought cheers Tony



Last edited by Toto_jp on Sun Mar 31, 2013 12:27 am; edited 1 time in total (Reason for editing : I'm old and forgetful)


__________________________________________________
K100 RS 1986
    

tio Jaimito

tio Jaimito
Platinum member
Platinum member
Thanks Tony, Ill check that too.
Rick, swearing in venezuelan spanish for Puente's amusement, for having to mess with the pump again. Sorry for the berinche.:bball:
UJ


__________________________________________________
Krazy Kat. 1985 K100RS Alaskablau 13000miles 8valve "Black Belly"

Peggy's 1987 K75s Columbia Grey 9500miles 6 valve.

Oil Pressure Light comes on at idle after it warms up K100_m12

Oil Pressure Light comes on at idle after it warms up K75_po12
Oil Pressure Light comes on at idle after it warms up Basil_10
http://www.nachicagonorth.com
    

charlie99

charlie99
VIP
VIP
a good suggestion tony


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OOil Pressure Light comes on at idle after it warms up 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 ..
    

RicK G

RicK G
VIP
VIP
@tio Jaimito wrote:Thanks Tony, Ill check that too.
Rick, swearing in venezuelan spanish for Puente's amusement, for having to mess with the pump again. Sorry for the berinche.:bball:
UJ

Very Happy Laughing


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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