2QM15 for Brian and James
My engine is on a Hunter 33, and I think that the original boat in question may have been a Hunter 30. The question related to my comment about making oil changes easy by installing a drain on the bottom of the pan, and attaching it to a little manual pump: The job was not too hard. The pan drops easily, without budging the engine. The pan slid out most easily going aft. There is a gasket that needs to be removed and a new one needs to be installed. This is readily available through your Yanmar dealer. I don't remember all the exact measurements, but I worked backwards from the discharge hose and bulb pump, which were standard outboard engine issue. You know, the hose that goes from the external fuel tank to the motor. I attached this to one of those little butterfly on-off valves that screwed into a 90 elbow that screwed into the fitting that screwed into the pan. I used a sealant that is impervious to heat, and just sized everything back to that original hose and bulb pump. In practice, when I change oil, I just let the oil cool for a couple of minutes, then open the little valve and pump with the bulb pump. All of the oil comes out in about thirty seconds. Then I wind up the hose and close the valve. By the way, this set up is at the aft end of the pan, so gravity is on your side. This turned out to be a really easy project, and might be the very first thing that I would do on a new boat. Everyone on this site should do it, considering how important clean oil is! Incidentally, if you are nervous about making the hole, just take the whole thing to a machine shop and they will knock it out with ease. Good luck.
