Posted by Nebraska Kirk on February 14, 2010 at 20:22:29 from (207.91.4.188):
In Reply to: Farmall M with 400 head posted by gene bender on February 14, 2010 at 19:53:58:
Cenexguy said: (quoted from post at 21:53:58 02/14/10) I have the M farmall tractor that my grandfather used to farm with. The motor stuck from lack of use in 90. Did a short block overhaul. Orginal head was cracked. The shade tree mechanic doing the work for me put a 400 head on it. The engine has the high domed fire creater pistons in it. I am not sure of the bore size. The tractor runs o.k., but I am not sure if it is timed right. It has the original mag on it and I would like to keep it this way. Would anyone have an idea where it should be timed?
The magneto must be timed so that the impulse trips when a piston is at top dead center on a compression stroke. Here is how to get it timed correctly. First, loosen the two mag mounting bolts and then rotate the mag all the way toward the engine, then slowly turn the engine over half a turn until the pin in the end of the crankshaft is exactly horizontal, finally slowly rotate the mag away from the engine until you hear the impulse click, tighten the mag mounting bolts and you are good to go.
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