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Subject: Ford 641

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Marshall    Posted 12-03-2017 at 17:25:02 [URL] [DELETE]        [Reply] [Email]  
  • Ford 641
  • Hey,

    Long time reader first time poster. Quick back story I have been wanting an old ford tractor for a long time. Two weekends ago I purchased a 641. It smoked a little black smoke and was back firing. But ran well other than that. I hoped it was just running rich, spark plugs indicated it was also.

    Next day I changed all the fluids, cleaned all the oil parts/breathers/air filters ect. When I drained the oil it smelled like gas and was thinning. I took off the air intake line and it was full of gas.I figured the float was stuck or something was wrong with the carb so I purchased a rebuild kit.

    Today I attempted to rebuild the carb ***MY CARB IS A MARVEL SCHEBLER TSX692***. Last night I let the carb sit in berrymans chem dip (overnight). I took detailed pictures and videos during disassembly (BUT WHO KNOWS IF IT WAS ASSEMBLED RIGHT PRIOR TO MY DISASSEMBLY). Today i put it back together as it was during disassembly. Hooked it back up to the tractor and it wont start and fuel is pouring out of intake side of carb/in intake hose from air filter when I disconnect it.

    Any idea what would be causing this carb to flood so much that fuel is getting in crank case/air intake hoes?

    Dollar Bill    Posted 12-04-2017 at 06:19:40 [URL] [DELETE]        [Reply] [Email]  
  • Re: Ford 641
  • "Any idea what would be causing this carb to flood so much that fuel is getting in crank case/air intake hoes?"

    Assuming you are turning off the fuel when you park it - In a gravity feed system, the combination of a leaky gas tank cut off and float valve can leak enough fuel to hydro lock the engine.

    The float valve seat should have a gasket between jet and carb body and it must be well tightened.

    How high did you set the float level? With the float and gasket installed and the bowl upside down (in your hand) the distance between the float and the gasket should be 1/4".

    Try seating the needle valve to ensure it is cutting off the fuel when closed.

    Check the "How To" section on red banner above. Scroll down to "Fuel System" and select "Carburetor - Service Instructions for TSX Carburetor"

    Rustyal    Posted 12-03-2017 at 22:53:40 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Ford 641
  • The float is not closing the valve.

    Farmer Dan    Posted 12-03-2017 at 17:29:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: Ford 641
  • Double check the floats to make sure they do in fact float (I have seen them fill with gas and sink) and that thy are adjusted right. Next check the needle set to make sure it is sealing like it should.

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