1 - A cold IHC gas-start diesel will fire if it's spun up fast enough. Key is to get the RPM's up into the mid/high end of the governed range. A suitably powerful starter to spin the engine to 1,200 RPM or higher could work. But it would have to be a BIG honkin' starter. And it would of course would need an equally big bank of batteries to feed. Probably not practical. (Incidentally the original MD thru 450 starter/electrical system is 12 volt...)
2 - A manifold heater could probably be rigged. But to be effective it would require the heating elements be located as close a possible to the intake valves. Ie. a pair of heaters, one at the end of each manifold runner. Again it would be complicated, expensive and require additional battery capacity to supply.
3 - Heating/cracking of the head should NOT be an issue when direct starting, so long as the engine was allowed to warm up a few minutes after starting. Reason: there's LESS heat absorbed into the head when idling unloaded on diesel than when running on gas. Ie. the engine will be warmed up more gently when started directly on diesel.
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Bottom line: Direct starting could probably be accomplished. But it would be expensive, and probably no more reliable than the original "start on gas" system.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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