The cups don't travel down below the surface of the head. They are there to provide even pressure on the top of the valves since they do not use a standard push rod setup.
The cups/valves get pushed down about .75-1" when the lever is pushed.
If you pop the valve cover you can see all of this stuff right there in front of you. You can then pull/push the decompression lever and see how it is functioning and compare it to how it should function. You could also take a look at the parts diagram (go to the CNH website and navigate from there) The diagram may help you see how everything in there works. I never fully comprehended everything that happened to go from gas to diesel until I took my valve cover/head off and watched it all happen.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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