The cap or cup over end of valve is pushed down with the decompression mechanism and is under neath the rocker arm shaft. If you wanted to take the cup off you would have to remove whole rocker arm assembly. They are a regular shaped valve but very small, and open into the spark plug, gasoline side combustion chamber therefore lowering the compression ratio for starting on gas. Usually you can get them to move down a little but getting them to move back up is a little harder. You might be lucky and be able to do so from spark plug hole but those two center ones are really hard to get at. May have to take manifold off. They have to move totally free and also not leak when seated. They are very prone to warping when not cooled on their seats. That is why I suggest checking by cranking with spark plugs removed with lever in diesel position as first of all if stuck open you will have total compression leaking out through the plug hole and if they are closed but leaking you will have some leaking. A slight leak can be tollerated .There are other ways to also check them but this is simplest.
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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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