well, here is how I time an F series mag to engine. loosen all 4 spark plugs and remove #1. Turn engine over until you feel it coming up on compression on #1. STOP. Take a 1/4" wood dowel rod, and place into plug hole, until it rests on the top of the piston. continue turning engine over until you FEEL TDC. If you overshoot, no crisis, just turn the engine backwards a little. When you are sure you are on TDC, then take the mag, and using a finish nail (10p works best for me), insert it into the oiler on the face of the impulse cover until you catch the impulse pawl, and hold it up. If you have the older style mag, there will be a little tab that you can pull up on to disengage the impulse. you can now spin the mag drive without the impulse engaging. make sure the spark advance is in the full retarded position.
Now, with the distributor cap off, rotate the drive until the center the brass insert in the rotor is oriented to the #1 plug wire post on the cap. Without disturbing the position of the mag, now place it on the mount about 1" away from the drive on the governor. Take out the 2 1/4" bolts holding the coupler on the governor drive. Slide the mag and the coupler disk over until it meets the governor drive. Rotate the coupler on the governor until the mag, coupling disk, and governor drive all engage. Locate the 2 holes in the governor coupler that you can thread the 1/4" in bolts into without moving or disturbing the orientation of the mag. They should be 180 degrees apart. Tighten bolts and install mag mounting bolts.
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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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