Farmall M missing when it gets hot

WV Farmall · Jun 8, 2012

I was tedding hay today with my M and it shut down when the motor heats up. Engine was not overheated, gauge was in safe operating range. I let it cool down for a little while and it was fine. I have heard that you can get a frost buildup in the intake that could cause this. Is this possible and what can you do about it? Any other suggestions would be appreciated.

Oldiron29 · Jun 8, 2012

When was the last time you adjusted your valves?
oldiron29

addeCNKS · Jun 8, 2012

More likely the coil. Run it again and immediately after it dies see if you get a spark, if not replace the coil.

WV Farmall · Jun 8, 2012

I will check the coil tomorrow. Valves were adjusted this spring. Thanks for the tips.

El Toro · Jun 9, 2012

Set the valves at .020" cold and see if that helps. Hal

FC Andy · Jun 10, 2012

Have you taken the carb off lately and cleaned and adjusted it? When I had an M, I had it tuned in really well. Then, the carb started leaking. I had to put a new set of gaskets and needle valve in it while working at the county fair. Anyway, I got it tuned back in and all was fine, untill I went plowing with it. It missed under heavy load. I got off, gave it 1/2 turn more fuel on the main jet, and it was a whole different tractor. Cured the miss, and picked up lots of power.

I know tedding hay isn't hard work, but that's my advice, if you think it's a fuel problem. It may have picked up some crud in the sediment bowl or carb and it starved for fuel. If it's not fuel related, It's most likely a bad condenser or coil. Good luck ! -Andy

WV Farmall · Jun 10, 2012

Carb is clean and in good condition. I put new kit in carb. Also put new points and condenser in distributor. Tractor will run if you pull the choke while it is missing. If you shut tractor off for five minutes and let it cool it will run fine for about half hour and then starts missing again. Still open for suggestions!!!

WV Farmall · Jun 10, 2012

Carb is clean and in good condition. I put new kit in carb. Also put new points and condenser in distributor. Tractor will run if you pull the choke while it is missing. If you shut tractor off for five minutes and let it cool it will run fine for about half hour and then starts missing again. Still open for suggestions!!!

RedRoundhead · Jun 10, 2012

Are you running premium gas? The lower grade stuff will/can vaprorize in the carburetor, if the ambient temperature is high, and the engine is hot. This happens alot on small air cooled engines.

I would have said it was a weak condenser or coil, but if pulling the choke helps it stop missing, then it sound like a fuel metering issue.

Just my opinion. Best of luck!

LarryM · Jun 13, 2012

Your symptoms fit a bad coil.

Farmall M missing when it gets hot

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