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Intake Air Pre-Heater Solves Problem On 1941 Farmall M
Frank Slapar, Pittsburg, Kansas, used scrap sheet metal and some plastic pipe to come up with a better intake air pre-heater for his 1941 Farmall M tractor.
"It solved the problem of sweating and icing around the carburetor," says Slapar.
His father bought the tractor new and it's been in their family ev
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Intake Air Pre-Heater Solves Problem On 1941 Farmall M TRACTORS Modifications 33-4-37 Frank Slapar, Pittsburg, Kansas, used scrap sheet metal and some plastic pipe to come up with a better intake air pre-heater for his 1941 Farmall M tractor.
"It solved the problem of sweating and icing around the carburetor," says Slapar.
His father bought the tractor new and it's been in their family ever since, says Slapar. "It was a multi-fuel tractor that ran on kerosene, powerfuel, or gas. It came with a 1-gal. fuel tank for gas that was used as a starter fuel, and a 22-gal. tank for other types of fuel. It also had a multi-fuel intake manifold with heat shield, which assisted in keeping the manifold and carburetor hot after it was started.
"The multi-fuel exhaust manifold developed cracks in it so we replaced it with a manifold designed for another tractor that runs on gas. However, we found that on cool, humid mornings the new intake manifold would sweat and, in some cases, form frost on the outside just above the carburetor. That didn't happen with the tractor's original multi-fuel manifold."
Slapar says he searched various Farmall internet forums for anyone who might be able to help. "Most respondents indicated that Farmalls were noted for this problem," says Slapar. "I couldn't find an intake manifold pre-heater that would warm the air before it enters the carburetor so I built one myself."
He started with a 16-in. length of 6-in. dia. stove pipe and a can that originally contained hand cleaner, and pop riveted them together. He made a 2-in. dia. hole in the stove pipe and fabricated an outlet to which he attached a 1 1/2-in. dia. plastic pipe, in order to route warm air to the air cleaner. He also placed sheet metal between the radiator and carburetor in order to route warm air coming off the tractor's radiator to the outside of the carburetor and to the intake manifold.
Contact: FARM SHOW Followup, Frank M. Slapar, 705 Osage St., Pittsburg, Kansas 66762 (ph 620 231-1366; samfm@ mobill.net).
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