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Discussion Forum

Re: Allis Chalmers C Fairbanks Morse Magneto

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Mike (Oh)

02-21-2003 16:46:45

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I really donít have an answer to this. My B does the same thing - kind of. It runs fine until it gets warm then starts to miss and finally dies. It will not start until it cools down. The only thing I can offer is what I have been thru. Was told the coil could be bad. Looked at spark when cold - looked good. Looked at spark when hot and was yellow. Ok found problem. Picked up another mag and put it in. Same thing - died when hot but spark looked good even when hot. Ok found a problem but not the cause. Someone told me they had a farmall M that did the same thing and it ended up being worn valve springs. Ok simple enough to change and kind of inexpensive - made no difference. Did notice timing mark would jump around and that ended up being bushing on end of governor (towards radiator) was working it way out - pushed it back in. timing mark was steady, ran better but still died when warm. Took compression test when cold - 75psi then when it quit - 50psi. Think this may be my problem. Not going the whole route just now. Bought rings and about ready to tear it down. Hopefully that will be the fix if the cylinder walls are in good shape and not too worn. Arenít old tractors fun.

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