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quite simply, it does. there is enormous pressure on that thing, and its under that pressure for long enough to squeeze oil out if its not sealing well. on the other hand, when its trying to fill up, it has a slight oil pressure from the side (non sealed system, its not really pressure at all, just air free supply) and a light spring inside to force it open again. the ball is critical. critical!
with time, the ones under spring pressure from open valves will collapse and empty, if clean, this is as you say a non issue. however, not being able to push it in by hand is not really a good way of telling if its sealing or not. you just cant simulate that pressure by hand easily. one thing is for sure, if you do manage to push it in, its still dirty.
as for diesel... nope. no way is that going to do jack [shizzle] to a truly dirty hla. i'm not saying your hla has to be that dirty to have a tick, infact, just a tiny bit of dirt will stuff them up, hence the endless problems...
summary :
sealing is critical. period.
diesel will not clean a badly dirty lifter. period.
when you have it properly cleaned and therefore sealed, you can wash it dry with solvents, and it will hold air pressure no problem. this is the level of cleanliness required for perfect operation. oil changes and good filtration are key on any hla engine.
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