The centre cylinder on my 3 cylinder diesel Yanmar powered generator was not firing. I had a mechanic check it out. No joy! I pulled the head, the exhaust valve and surrounding area was thick with carbon deposits. The valve couldn't close. I recall the old guy I bought it off saying he would start it up and run it a few hours every year. (He never took the boat anywhere.) I think that is why, diesels need to work, they need a load.He wasn't running anything like the AC. I cleaned it all up and used clover compound on the valve seat. It didn't take much. I set the head upside down and poured alcohol onto the valves of all three cylinders, an hour later the little puddles were still there. So I reassembled the motor and gave it a quick test start, it tried to run but I stopped it. The boat is on the hard, that will do till spring. I think it is good. Starter motor is back on the Cummin's 5.9 All wiring back in place, I left the heat exchanger off and I'm going to soak it in Lime remover for a time. Next up is the new Raymarine AutoPilot, That is going to be interesting. Meanwhile I'm building a dingy lift in my garage. FUN!
