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Re: Performing compression test on Penta
bob, salt water eats blocks. Fresh water is no big deal.
Why not just fire it up, see how the engine runs, see if it moves the boat at hull speed at a reasonable rpm without smoking, and if everything looks good, let it be?
Then after you've put some hours on it, spend $25 on the oil analysis to find out if the engine is chewing itself up, etc. If a diagnosis was important to me, I'm not sure I'd want to have trainees doing it. By definition, they lack the experience to really know what they might be looking at.
With four years on the timeline, check out a class at Mack Boring on diy diesel maintenance, you may find that invaluable for the big trip, and it will teach you what to look for on your own engine in the meantime.