[Farmall] Farmall Model H - Cuts out after 45 min to an hour

[Mike Sloane]

Since it takes almost an hour for the engine to quit, you can pretty 
well eliminate the carburetor as a source of trouble - if the carb was 
the problem, it would likely not run at all or very poorly.

I did have a similar problem with my Super M, and it turned out to be 
the little metal cap from the end of a gas can spout that was floating 
around in the tank. The tractor would run fine and then mysteriously 
quit when the cap found itself over the tank outlet. It drove me nuts, 
but I finally found it with the help of a very bright flashlight.

I am not as knowledgeable about magneto ignitions as I am with electric 
ignition systems, but you might want to look very carefully for any 
wires inside the distributor and coil housing that might be touching, 
especially ones that are very close to touching and could short out when 
hot and expanding. But if the behavior before and after the magneto 
change is exactly the same, that is an amazing coincidence. :-) I will 
agree with Steve, however, that everything points towards a bad coil.

If it was an electric ignition system that was converted to 12 volts 
from 6 volts, my guess would be the lack of or too small a ballast 
resistor in line with the coil, causing it to overheat.

Mike

keith murphy wrote:
> Hi Bigdog,
> 
> Thanks for the feedback.  I got the magneto mail order and I am not
> sure if it has a new coil.  The carb was new as well, but I could
> still have some junk in the line..   The gas cap is new, but may not
> be proper either.  Since i drive about 2 hours into a place where I
> cannot find parts, does anyone know the part number for the coil?  I
> can always clean the lines and make a gasket to re-seal the carb..
> 
> Thanks, for the response.
> 
> Regards, Keith
> 
> Bigdog <dbigdog at columbus.rr.com> wrote: Keith, those are classic
> signs of an overheating coil. But, since you've already replaced the
> mag, that may not be the case. One thing to do is to check for spark
> after it dies. If you do not still have a bright blue spark about
> 1/4" to 3/8" long you have an ignition system problem. The other
> possibility is a fuel supply issue. If the vent in the fuel tank is
> plugged you may be creating a vacuum in the gas tank. Try removing
> the gas cap after it dies. If you hear a sucking sound as you remove
> the cap, there is a vacuum in the tank. It could also be dirt or crud
> in the tank blocking the outlet. ----- Original Message ----- From:
> keith murphy To: Farmall/IHC mailing list Sent: Wednesday, November
> 09, 2005 9:36 AM Subject: [Farmall] Farmall Model H - Cuts out after
> 45 min to an hour
> 
> 
> Hi Folks,
> 
> I have a 1941 Farmall Model H with a six foot bushhog on the back.
> When I run the tractor after about 45 min to an hour it just shuts
> off. I let it sit for a while and it goes right back to running fine.
> I have replaced the magneto, plugs, carb and the wires, oil, filter,
> and still no luck. The water is moving in the radiator and is hot but
> suprisingly not scalding hot. I was thinking it was simply over
> heating, I do not know - maybe the thermostat? Any ideas would help!
> 
> Thanks, Keith
> 
> http://www.antique-tractor.com/mailman/listinfo/farmall
> 
> 
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-- 
Mike Sloane
Allamuchy NJ
mikesloane at verizon.net
Website: <www.geocities.com/mikesloane>
Images: <www.fotki.com/mikesloane>

Human kindness has never weakened the stamina or softened the fiber of a
free people. A nation does not have to be cruel to be tough. -Franklin
D. Roosevelt, 32nd US President (1882-1945)


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