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 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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