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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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