Posted by ScottyHOMEy on October 09, 2009 at 08:43:28 from (71.241.198.25):
In Reply to: Farmall ? posted by jayinNY on October 09, 2009 at 07:46:02:
Sounds an awfully lot like the remnant of the heater for a dual-fuel engine. It was started on gas from a small tank and switched over to distillate once it warmed up some. Distillate was a pretty low-grade fuel, and the purpose of the shroud and the valve was to trap heat from the crankcase and exhaust side of the manifold, to warm the intake side of the manifold to give the distillate a fighting chance to burn well in cold weather. When actually functioning, you had a choice of several adjustments, with as close to regular, unimpeded convection through the shroud being the setting for warm weather, and as near closed as it would go for operating in the cold. I could only speculate whether the effect was to improve vaporization or to reduce condensation of the carbureted fuel as it was drawn up thorugh the manifold or some combination of the two, but the net effects were a better burn and less washdown of fuel into the crankcase. Distillate ran cold, so you'll often find radiator shutters, too, on tractors with distillate/dual-fuel motors, to raise the coolant/operating temp of the entire motor.
Now, after all that . . . if your valve is a simple plug, or looks like a simple plugged up check valve, or with the remnants of a small valve on it, it may have been a hookup for a vacuum line that could be used to operate a milking system.
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