In regards to an Islander 30 and or Islander 30 Bahama, I believe it has a diesel engine. At first I thought it was a Yanmar but it appears to be a Volvo Penta. Standard 2 blade prop, does it have enough guts, and do the readers have any idea what size engine it might be. It appears to be a two cylinder. If a Volvo, are there parts available for this engine, boat is a 1981??