They had to use a down-draft carburetor because when the engine was designed they did not allow enough space between the push-rods to get the spark plugs in. The spark plugs had to go on the other side of the engine under the manifold and thus the standard up-draft carburetor could not be used (you would not be able to get at the spark plugs). The 12 engine has the magneto on the right with all the spark plug cables going in a tube around the back of the head to get to the plugs. Changing plugs with a hot manifold is not too easy and normal plug socket wrenches cannot be used. With the down-draft carburetor they had to use a pump to get the fuel to it as it is not now below the fuel tank as is required for the up-draft carburetor. In the Farmall A engine, the same bore and stroke, they angled the push-rods to give enough space for the spark plugs, though only just enough, In the later Farmall A engines the space was made a little larger so that conventional spark plug wrenches could be used. The moral is, one fix to correct one mistake usually involves more fixes to correct the effects of the first fix.
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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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