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Fordson Tractors Discussion Forum

Priming an oil pump

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Robert Starling

11-16-2004 19:25:39




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During my 56 FMD rebuild I thought I would try to prime the oil pump before I put the timing cover on to help prevent cranking too long without oil pressure.

I had installed the sump and all the timing gears. I then removed the cam gear that mates with the crank gear so that I could turn
the gears on the cam and auxillary injector shaft which turns the oil pump. But I cannot get any oil to pump up to the head just by turning. I have filled it with oil. Is there another way,
without taking the sump back off and removing the oil pump and priming it by hand?? Or could I just be turning it too slow?? Thanks Robert.

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Long Don

11-16-2004 21:53:20




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 Re: Priming an oil pump in reply to Robert Starling, 11-16-2004 19:25:39  
You can inject oil into the pressure sensor port to oil the pump. Be sure you are turning the shaft the correct way. You will have to get the filter full before you get any oil to the head and this may be impossible or impractical to do by hand. Try adapting a drill to do the turning. You can tell when it is fully primed as it will get a lot harder to turn. Priming is a good thing to do after a rebuild.

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Robert Starling

11-18-2004 11:56:16




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 Re: Priming an oil pump in reply to Long Don, 11-16-2004 21:53:20  
Don, I tried what you suggested and it just shot oil out of the oil pressure release valve. It might just take more RPM and time to get the air out of the gallies. Thanks again.



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Mark 1

11-18-2004 20:38:17




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 Re: Priming an oil pump in reply to Robert Starling, 11-18-2004 11:56:16  
Throw the lever on the front of the valve cover up to release the compression in the motor.Now turn the motor over.If you used moly assembly lube you should be ok.If not you should be okay anyway.On some tractors that I have seen have the lever removed and there will be a "plug" in the cover. You can take the valve cover off and take a vise grip or what have you to rotate this mechanism also.



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