These are gasoline start diesel engines. There's a third valve in each cylinder that opens up to a chamber containing a spark plug, plus some butterfly valves in the intake manifold which switch the air to flow through a carbuertor. In the start position, the engine runs on gasoline using a magneto & conventional spark ignition. Once its warmed up a little, you switch to diesel, at which point the third valves close to increase the compression, the intake air is routed around the carburetor, the magneto is grounded, and the diesel injection pump does its thing.
In theory, you could start one of these with a hand crank in the gas position, although I've never tried it. The engine has to be turning fast enough when you switch to diesel to have enough inertia for compression ignition.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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