Well the fogging could have helped a lot. It's just hard to say. It's mostly a closed system so if it was fogged with something that lasts it may have helped a lot. However, if the muffler
was full of old salt water
, and that evaporated over time into any open valves, you could have some rusting in there, especially on valve stems etc.
-First I would see if the engine turns. Either do that just tapping the starter or try to turn the crank with the crankshaft nut etc.
-If it turns
(they are always hard) I would be tempted to pull the injectors and spray in there with a light oil or WD40 etc. Let it sit a day then try to start it. (If it had sat only 3 years or a bit more I would probably give it a go and see if it runs)
-New fuel filters and fill the filter housings with fresh diesel
-If it does not turn
over readily, then personally I would take the head
off and see what the condition really is. A 2 cylinder head removal
is probably a half hour job. It's worth knowing the actual situation.
Another thing to think about in any case is the 10 year old diesel
. It's probably pretty bad.