Larry Bishop at Mack Boring is the best
We took his 3 day class in 2000 right after we bought our boat. It gave us so much confidence in the Yanmar and our ability to deal with it. We took the class in New Jersey but they also give them in Buffalo Grove, IL.He sets every student up with an engine exactly like the one in their boat. You take it apart, change something and reassemble. Then you hook it up to a battery and start it. Wow! It is so amazing when it starts. At least to me. You learn to bleed your fuel lines, adjust your valves, bleed your fuel lines, clean your heat exchanger, bleed your fuel lines, change your impeller, bleed your fuel lines, chnage oil, bleed your fuel lines, change filters, bleed your fuel lines, replace belts, bleed your fuel lines, inspect your engine mounts and most important, bleed your fuel lines.Worth every dollar we spent on tuition, air fare, rental car, hotel and meals. I would recommend the class to anyone who wants to work on their own engine. You will save way more than the cost of the class. But the biggest benefit will be enjoying your boat more.