I don't remember just where I got the information. Might have been at service training from one of the older IH "block men" like they called them back then. But anyway, the explanation is for safety first off and second, the magneto's advance was closer to 40 degrees so setting it 5 after gave you the recommended 35 degree advance. As you well know, a few degrees one way or the other on those old low comp engines didn't amount to squat. When we put power packs in , well, things got to be fussier. One other thing that has never been mentioned is if crankshaft has been ground, sometimes the grinder cheats a little to get the best overall journal and that can change the top dead center a bit. The local machine shop explained that to me one day as I had found an 806 diesel that the flywheel tdc mark was off 8 degrees and it had been reground previously. I used a dial indicator on piston when head was off to determine that. That really threw me as I hadn't run into that before or maybe just never checked the marks that close. I would not want to hand crank an engine timed to fire at top dead center. It could go either direction really easy.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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