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 - 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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