Not familiar with 23D engine but have several 300000 series engines that look much the same. There is no lobe on cam but a short flat that the plunger drops into to close the points and then opens them almost immediately. They will be held open for most of the cam rotation. Plunger travel is less than .020.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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