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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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