Yanmar Marine Diesel Engines

I have a sailboat 1979 Oday 28 '. Our Yanmar diesel produces a dirty, greasy, but not a smokey exhaust. Our table was dirty almost immediately. I removed the muffler and water is very dirty as well and I do my best to degrease. Suggestions?

Simple Green is your friend, it is biodegradable, so you do not have to worry about the fish kills.

Seals are suspects in this case. If an O-ring, you'll see that you oil as the engine runs and escapes diesel, rings pollute the oil in your crankcase. The oil penetrates the upper cylinder intake valves may be diluted by diesel injected and burned.

This largly leaves exhaust guide seals suspect oil is blowing in your exhaust manifold gaskets and exhaust pipe of your dribble across the board.

marine diesel should last about 20,000 hours of operation. Depending on how they are operated and maintained, some last longer and some will not make that mark (in any case it is usually well out of warranty before it begins to make problems.) Given the hydrocarbon production by two shots that are popular marine engines, you're likely not to pollute the water much more than they.

If you do not have a large quantity of oil, simply smear the transom from a mechanical point of view, it is probably not worth playing with, just ask a degreaser like Simple Green, scrub and rinse and you're clean again.

If you're really paying liters of oil in it regularly, it is time to watch hours of your engine and take a decision. If you are less than 20,000 hours on a marine diesel engine (likely you), I remove the cylinder head and have redone rather than reforming the entire engine, you'll spend about $ 300 a head again in contrast to a couple grand in parts just to put a stone short in.

Most machine shops should be able to rebuild your head for you, if they do not trade sitting on the shelves.

Good luck

Your piston rings and / or valve seals are worn. It seems that its time for a valve and employment cycle, especially if the engine is as old as the boat. 28 years, it might be time for an oil change.

A diesel engine likes to run almost wide open. In a sailboat that runs slowly for a time to sort and you lift the veil on and off. Put in new fuel with filters and (c-boost Taine) and get a good race and then get a valve adjustment. a diesel engine is like a truck its smoked at the beginning and a boat sailing from her as usual

I see what your problem is ... This is not your engine. You have Oday. The diesel engine does not like your boat.

I just had to say. Actually, I agree with these other guys. Depending on the amount of oil you add for each hour of engine, I can not even bother to do something for the engine.

I spent last summer, no motor. It is a sailboat. I would sail in and out of my slip. I chose days to go sailing when I knew in which direction the wind is blowing. There was no way I could have turned my sheet if the wind came from that direction.

Also, I know that my Yanmar has a sweet spot. 2000 rpm is where it works best. If I crank up the 4k, it will explode all sorts of things on the rear of the boat from black smoke, the oil on the transom, and probably some other things I do not want to think.