Join Date: Mar 2006
Location: New England
Thanked 5 Times in 5 Posts
Rep Power: 12
Most common possible causes:
Plugged air filter or insufficient air flow to engine
Too much exhaust back pressure
Defective turbo/supercharger, if there is one—not particularly likely as most sailboat diesels aren't super/turbocharged.
Injection timing off
Prop improperly sized—too big
Heavily fouled bottom
Too many accessories being driven
Rope around propshaft
Assuming you've checked the prop sizing, haven't added any new engine-driven accessories—like a new refrigerator or alternator, cleaned the bottom of the boat and checked to see the prop shaft is clear. I would check the air flow and the air filter.
If the air filter and air flow to engine are good and the engine isn't overloaded... I would test it by using putting good clean diesel into a portable tank and then feeding the engine from the portable tank. If it is still blowing black smoke, then it is most likely a problem with the injectors—either they're fouled or the fuel injection timing is off.
I would also inspect the exhaust system to make sure it hasn't got a crimped or kinked hose or a hole in it someplace. This isn't all that likely, unless you've made changes near or to the exhaust system setup.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Last edited by sailingdog; 04-13-2007 at 02:53 PM.