Yanmar 2GM20F blew oil/fuel out exhaust
Posted: Wed Jul 05, 2017 10:37 am
I was coming out of a harbor when I cranked up my Yanmar 2GM20F a little higher than normal (cruising at approx 5 knots with growth on hull). at the worst moment (busy inlet) my motor blew a bunch of oil (all over my new dingy but that's another matter ) out the exhaust. I turned the key off and proceeded to put up the sails in about a knot of breeze. I was having trouble finding a breeze to fill my sails, but the boat was inexplicably tracking well. It took me a minute to notice that the motor was still running as I had instinctively turned the key instead of starving the fuel. It was no longer leaking any oil so after a time and enough wind for steerage, I turned the motor off, checked the oil and added a tiny bit, tuned the motor back on and limped home at half speed (3.o knots motorsailing) for about 6 hours.
The motor never gave me any trouble after that. Checked the oil and kept an eye on the exhaust port but the engine behaved fine the rest of the trip.
I am told that sometimes unburnt fuel can build up in the engine and then let go at once? Any other ideas about how oil or fuel can get shot out an exhaust?
The motor never gave me any trouble after that. Checked the oil and kept an eye on the exhaust port but the engine behaved fine the rest of the trip.
I am told that sometimes unburnt fuel can build up in the engine and then let go at once? Any other ideas about how oil or fuel can get shot out an exhaust?