Posted by Janicholson on March 21, 2015 at 06:38:14 from (199.17.6.160):
In Reply to: Re: '40 Farmall H posted by Rwverde on March 21, 2015 at 01:35:59:
I agree with the idea of repairing the mag, or replacing it with a IH distributor. But the question you asked is as follows: Because the coil is gone, things get some easier. Remove the cap. The rotor is geared to the mag cam shaft. It has marked teeth using bevel cuts and or other marks to align the gears (mandatory timing issue here) rotate the engine to get the marks aligned (tiny and might need visual magnification to see) Remove the rotor and the plate holding the rotor shaft to gain access to the points. Run a wire from the points (movable) to the terminal on the side of the mag (no other connection) Set the point gap at .013" on a high point of the cam. Replace the plate and rotor. Install an ignition coil designed for 12volt operation with no external resistor. (NAPA or other parts store) Connect the negative terminal of the coil to the "MAG" terminal to which you connected the points. Connect the positive to a (different) ignition switch A simple toggle SPST will work. The original switch is a mag switch and grounds the mag to stop the engine, or does not exist. (early tractors had a cable connected mechanical grounding control. The new switch will go to the amp gauge to get 12v. A condenser (matching the coil) for the system must also be placed in the circuit. It can be connected to the coil at the negative terminal and the body of the condenser grounded. A coil wire is used to connect the high voltage to the center terminal of the cap. This will make the existing "MAG" into a distributor. but will not be as smooth as a distributor with timing advance control. If the mag impulse coupling does not snap when cranking, this system will not work. It must have the impulse coupling to allow starting, and the reasonable advance when it starts. Jim
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