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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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