BMW K bikes (Bricks)

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1Back to top Go down   COOLING FAN CURRENT DRAW Empty COOLING FAN CURRENT DRAW Thu Mar 15, 2012 4:13 pm

RSMITH

RSMITH
Silver member
Silver member
Hi All,



got the cooling fan motor rewired and rebushed. it does seem to spin a little slow and it draws approx 7.9 amps when running, assembled with the fan blade on it mounted in the shroud.



question is is this ok - or should it be less?

    

2Back to top Go down   COOLING FAN CURRENT DRAW Empty Re: COOLING FAN CURRENT DRAW Thu Mar 15, 2012 7:57 pm

charlie99

charlie99
VIP
VIP
sounds about right to me ...im also in the mix for doing a refurbishment this comming weekend

after doing a little more research it looks like about 4- 5 amps is the figure we should be looking at ....

unless you have tight bushes /worn brushes or something ..(possibility )

just looked at one of the suppliers sites



http://www.euromotoelectrics.com/Cooling-System-BMW-K-Bike-Fan-Motors-and-Assembly-s/5.htm


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OCOOLING FAN CURRENT DRAW 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 ..
    

3Back to top Go down   COOLING FAN CURRENT DRAW Empty Re: COOLING FAN CURRENT DRAW Fri Mar 16, 2012 12:40 am

RicK G

RicK G
admin
admin
Just a bit under 5 amp is right. I always make the bushes a bit loose as they are less prone to the dreaded siezure by rust. There is no danger of the armature touching the poles with extra clearance.


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

4Back to top Go down   COOLING FAN CURRENT DRAW Empty Re: COOLING FAN CURRENT DRAW Fri Mar 16, 2012 10:20 am

RSMITH

RSMITH
Silver member
Silver member
thank you chaps.



perhaps it will loosen up a bit as used and the amps will come down

    

5Back to top Go down   COOLING FAN CURRENT DRAW Empty Re: COOLING FAN CURRENT DRAW Sun Mar 18, 2012 12:23 pm

RSMITH

RSMITH
Silver member
Silver member
stripped the motor to have a look. I was not happy that it was so loosly mounted in the housing.

sorry but an APAULING job had been done - I took the brushes out and reshaped them , resoldered properly the wiring contacts and cleaned everything up, sorted out the springs and "loosened up" the bushes. The job was done by a big auto electrician place, so will not do business with them again.

all I can actually say is that I paid for the motor shaft bushes, and I understand lathe time and labour - but considering the I have had to redo the job, except for the motor shaft bushes part i am a bit annoyed.

anyway I have done it and the fan runs great now , amps are down to around 3.6 Amps, and it blows strong. I also extended the plug wire a bit and cleaned up the 2 pin connector.

true to form I have at least learnt some more and now I understand this motor and will not be afraid of it in th future, and onc again i have confirmed that i should just do everything myself and only get help from guys who know these bikes.

    

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