With the distributor ignition, there is a set of weights and springs that (like a governor) advances the spark as RPM increase. The distributor shaft is 2 piece. The drive end is turned by the shaft in the drive housing, and remains timed to the engine through the cam drive gearing. The distributor cam and rotor shaft are fitted over this shaft and rotated with the above mechanism of weights and springs to do the advance. In a mag (found on a Letter series from the factory) the initial timing is TDC, happening when the impulse coupling trips at starting or hand cranking speeds. At Idle or above the advance is full advance at all times. This leads to moderately rough running at idle speeds from excess advance, but the tractors were designed to be wide open 90% of their lives. Jim
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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