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Old 02-11-2013
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Re: Oil in exhaust?

Klem,
Great explanation! On a 2 day cruise we just got back from, I saw both smoke symptoms. Black when I tried higher revs and thin grey smoke at low revs. I'll look into cleaning something and get some help. The boat speed was fine & as anticipated at whatever RPM I tried, so any mud on the prop is long gone.
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Re: Oil in exhaust?

oil in exhaust is generally from the oil cooler. Sea water cools the oil and because oil pressure is more than water pressure, oil passes to the cooling water and finally to exhaust.
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Re: Oil in exhaust?

Your diesel could use a decarbonization via the fuel tank and the crankcase oil. Improvements will be noticable quit soon after using "Seafoam", obtainable from any automotive store.
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Old 02-12-2013
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Re: Oil in exhaust?

Did you see oil on the water? If not, then you probably aren't exhausting oil.

Other than that, black smoke can mean barnicles on the prop. (At haul, out, I had 6 feet of line wrapped around the prop.)

I suggest you buy a mask, fins and a snorkle (and wetsuit). Like owning a Mast Climber, it pays for itself quickly.

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Re: Oil in exhaust?

Have you always seen grey smoke at lower revs? If you haven't, check to make sure everything else is normal like engine operating temperature.

Have you always seen black smoke at the higher revs? A little bit of black smoke at high loads is perfectly normal on older diesel engines. They allowed them to overfuel a bit to get the horsepower rating up, the newer ones don't do this because of emissions. The only real downsides to it are it is worse for the environment, your mileage will be worse, and you can damage pistons and valves in extreme cases with high exhaust gas temperatures. If the black smoke is new and everything else being normal such as the boat speed versus the rpm, the first thing that I would look at is the air filter, a plugged filter will cause this.
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