1952 allis b converting from mag to distributor?

I'd stick with the magneto. I've had a '42B for many years and would never consider changing it out to a distributor (battery ignition system). They are really not hard to time once you understand the basic principles. Have you seen my own web page on that subject? I also provide a procedure for timing the internal gears if you cannot find the specific marks on them. Doing it w/o the marks on the gears, I'd use the FIRE mark on the flywheel, to first properly mate the mag base with the engine, not the TDC mark. You also need to be sure you are on the compression and not the exhaust stroke. Using the TDC mark in such a procedure could result in incorrect timing because of the spring windup in the mag impulse coupling. The impulse coupling causes the rotor to not be perfectly aligned with the timing lug (unless you rotate the engine or mag backwards). The rotor is somewhat before the lug just before TDC and immediately snaps past it at TDC when the mag fires the #1 tower. The rotor will be exactly aligned with the timing lug only when the mag is rotating at a speed sufficient to disengage the impulse coupling. That requires the tractor to be actually running. The impulse coupling provides an ignition retard function during starting only. When the impulse coupling is disengaged due to engine speed, the ignition is automatically advanced to the proper running timing.

Rod

Hope this helps

Wil

• Hobby farm

Damon
N.E. Texas