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Fordson Tractors Discussion Forum

Re: Fordson Super Major starts but runs slow.

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robert major

12-21-2013 13:16:38

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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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Nick Ballem

12-23-2013 05:48:34

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 Re: Fordson Super Major starts but runs slow. in reply to robert major, 12-21-2013 13:16:38  

Hi, Thanks for your comments.

It"s a rubber diaphragm. I had the governor apart a couple of winters ago. Back then I found that the dampening valve had fallen off. I fixed it and put the governor back together. It doesn"t seem to be stiff because I can hand operate the fuel stop lever. When I disconnect the pneumatic tubes off of the governor, plug the two holes with my fingers and try to move the fuel stop lever back or to the left, I feel a lot of resistance. This tells me there are no air leaks. When I move the fuel stop lever back or to the left and then plug the holes with my fingers, the spring and diaphragm returns back to normal position. According to the manual this procedure tells me that the diaphragm is leaking air!!! I"m confused, It leaks air in one direction but not the other?

I"ve attached a diagram of the diaphragm unit. The part that I don"t understand is when you pull the throttle to give more gas you end up moving the butterfly valve closer to the closed position, which causes the engine to suck harder on the governor diaphragm. This action looks like it decreases the amount of fuel by moving the fuel control rod to the right. Isn"t it suppose to be increasing the fuel, not decreasing it? That"s the part that I don"t understand about the governor.

I am using the excess fuel button for cold start but it doesn"t make a difference.

I think I will try using a rad hose heater. I"ve been trying to avoid this because it"s a band aid approach, but I"m running out of ideas to try. I would rather like to use an engine block heater but I can"t find a location to put the engine block heater into. Anyone know where I can install an engine block heater?

four years ago this tractor started at -18 Celsius with only about 15 second of turning the engine over with no rad hose heater and not using the excess fuel button. Something changed and I can"t figure out what!


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