You guys are confused, except for Bob in the message below. There are essentially two ratchet/pawl mechanisms. First is the one we're all familiar with between the crank itself and the engine crankshaft, which allows the engine to turn in the right direction without spinning the crank further.
The second ratchet pawl arrangement goes between the crank and the tractor/engine frame, and only allows the CRANK to turn in one direction.
That way, when the engine kicks back, the engine crankshaft catches the crank and tries to spin it backwards, but the second pawl catches the crank and keeps it from turning backwards.
As someone else pointed out, both mechanisms would have to be able to take the force generated by the engine trying to turn in the wrong direction. I'm not sure what would happen if the engine was suddenly stopped near the top of the power stroke, but intuitively that seems like a good way to break a rod or a crankshaft. Maybe a spring arrangement could be used to limit backward crank travel without a hard stop.
Probably a better idea to just make sure the timing is retarded sufficiently to make sure the engine is well past top dead center on the compression stroke before it fires. Remember, the model T used buzz coil ignition to start, and the timing wasn't all that accurate. The situation was even worse if the driver forgot to retard the spark before cranking....
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