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Fordson Tractors Discussion Board

Re: Fordson Super Major starts but runs slow.


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Posted by robert major on December 21, 2013 at 13:16:38 from (216.81.16.111):

In Reply to: Fordson Super Major starts but runs slow. posted by Nick Ballem on December 21, 2013 at 06:28:53:

Hi
If you got a vacuum governor and it"s that cold it could be the leather diaphragm is not flexing in the cold. those diaphragms are lightly oiled. and pulled to rev the motor by the difference in vacuum in the 2 lines that come from the intake manifold, so if the oils cold it will be so stiff to move, I think some later ones might of even had a rubber diaphragm in so cold would affect this also. or the linkage in the pumps binding when cold. That would be my guesses as to why it works in the summer and not winter.
when you got it running try warming that housing where the pipes go into the vacuum unit on the pump and see what happens,to throttle response. if it"s that diaphragm it should start working right.
you do also know the pump has excess fuel button for cold start just at the bottom of the stop linkage. should be a little round push button poking out.
Also as others have said you need a block heater of some sort, cranking/ starting it like that when cold will seriously shorten the life of the motor.
Had a customer tractor out side this week minus 20oc, just for fun turned the key it would not even turn the motor over. Plugged it in Thurs night went to it yesterday morning( Friday) 2 turns and it fired right up just like plus 30 temps I don"t usually leave them on that long but didn"t have a spare timer around.
Regards Robert


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