Hello, This is my very first post so I hope I'm doing this correctly.
My brother has just bought a 1982 34' Irwin
with a Yanmar
in it, He just sold his 30' Irwin
with an Atomic 4 in it.
He is new to diesels. Well anyway he purchased it at a marine
about 600 nautical miles from Chicago, his home port, Last weekend he
took the boat out for a test sail and it sailed perfectly, he had some problems with the diesel
. Running below 1500 rpm's all is fine,
running over 1500 to 2200rpms the engine
is putting out Black
smoke, he pulled back to idle shut it down and checked the oil
he went about 1/4 to 1/2 a mile and he used up about 1/2 a quart
. the air cleaner is full of oil. It seems that the crankcase
is pressurizing at higher rpm
and the engine is burning the fuel
through the intake. When he runs it at below 1500 rpm
it is fine.
The previeous owner had the injectors change just before the boat was put in the water
. My brother wants to make sure he has a good running engine before bringing the boat on the long journey home.
Any ideas? I'm writing this because I'm the designated mechanic