Isuzu and yanmar

[sfnz]

urgently need workshop manuals, first is for a small isuzu 3 cylinder model 3KC1, the other is for a yanmar marine 2qm20H model, i did have them in a laptop that decided smoke was fun to make so pretty much everyting dissappeared. I know they're on line somewhere but I haven't had much joy finding them

[sfnz]

ok found the isuzu one here, The engine I have is a little different in places and as it has no serial numbers either on the timing case or the sump I was wondering if there were changes upgrades etc through the years........... anyone know anything about these ?