I was looking for thermostat and cooling fresh water pipe parts for my Yanmar 3JH3E and I came across Marine Diesel Direct and they have the listing of Yanmar Engines and other engines. You can search by part number, by group, or catalog number. I thought I would share it to all. Very helpful to a newbie like me. Ordered all new hoses and thermostat from Toad Marine Supply.
www.marinedieseldirect.com/catalogs/
Enjoy
