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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  #1  
Old 06-26-2010
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What's up with my engine? (need 1000 words for my picture)

OK, so I've just bought an old boat with a 1979 Volvo Penta MD11C engine, rebuilt in 2001 with approx. 250 hours on it when I bought it, and now around 350 hours after bringing her home.

This is my first diesel engine, so as far as the engine is concerned, I'm a complete newb.

Stern was clean when I left, and I had the engine professionally serviced (oil change, oil filter change, all other fluids, fuel filters, and impeller checked, all OK).

Trip was 725 naut. miles, the full length of the Baltic. Sailed about 1/2 of the way and motored the last 1/2 or so when the wind died completely.

The engine performed flawlessly. I ran about 2000 rpm which pushed the boat along at around 5-5.5 knots. Temp remained good entire time. Plenty of water coming out of the exhaust. Nothing to suggest anything amiss.

But upon arrival, the stern exhaust port looks like this (see photo).



So... what's up with my engine? Should the exhaust port be that dirty?
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Cruising the Baltic in 'Merihiisi', a 1979 Westerly Berwick Ketch

Last edited by patrickstickler; 06-26-2010 at 11:24 AM.
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Old 06-26-2010
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welcome to the smudge on the transom club! Not many boats don't get some kind of smudge if the exhaust is out the transom.
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Old 06-26-2010
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I don't see nuttin?

The yellow stain is not something I've seen, and the black looks pretty dark...but how was the exhaust when it was running? Clear, blue, black, white?
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Old 06-26-2010
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Quote:
Originally Posted by T37Chef View Post
I don't see nuttin?

The yellow stain is not something I've seen, and the black looks pretty dark...but how was the exhaust when it was running? Clear, blue, black, white?
White to clear. Whiter when at higher RPMs.
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Old 06-27-2010
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Try removing it with MaryKate Easy On & Off Gel, and then see what happens. The black is soot more likely than not, and that is pretty common if the engine is running too rich or under a heavy load.

What is the WOT RPM on this, and what is the redline on the engine?

If the prop is sized wrong, you could easily have this happen.

Also, what is the LOA and LWL of the boat??
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Old 06-27-2010
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Quote:
Originally Posted by sailingdog View Post
Try removing it with MaryKate Easy On & Off Gel, and then see what happens. The black is soot more likely than not, and that is pretty common if the engine is running too rich or under a heavy load.

What is the WOT RPM on this, and what is the redline on the engine?

If the prop is sized wrong, you could easily have this happen.

Also, what is the LOA and LWL of the boat??
The max RPM per the manual is 2500 and I was running around 1800 - 2000 most of the trip.

The boat is a Westerly Berwick Ketch. LOA 31 feet. LWL 25 feet.

Prop appears to be original, and thus used on the boat with this engine for 30 years. Presume it's the right size.
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Old 06-27-2010
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I'm wondering if the white is some oil that got into the system. You folks have seen machine shop milk right? It's a mixture of oil and water and would leave a stain a lot like that.
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Old 06-27-2010
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You might have just blown out the built up carbon.
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Old 06-27-2010
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Some soot is normal, a LOT of soot is something to think about. Having said that, consider that you in 9 years the engine has run roughly 28 hours per year... and you made the engine do roughly four years of her usual effort in one trip. Chances are she is gonna let you know she isn't happy with the change in routine.... IF she isn't happy.
Did she buck, sputter, whine, spit, complain, refuse to start, or otherwise let you know she is no longer interested in hanging out with you?

Let me clarify: The ENGINE, not your WIFE.
If the answer to the above is "no", and you didn't notice any serious white smoke (diesel smoke is like marijuana: a whiff is okay, but when you start hacking and coughing and can't see for the smoke, you have a problem), then I would not be too worried.
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Old 06-27-2010
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Quote:
Originally Posted by bljones View Post
Some soot is normal, a LOT of soot is something to think about. Having said that, consider that you in 9 years the engine has run roughly 28 hours per year... and you made the engine do roughly four years of her usual effort in one trip. Chances are she is gonna let you know she isn't happy with the change in routine.... IF she isn't happy.
Did she buck, sputter, whine, spit, complain, refuse to start, or otherwise let you know she is no longer interested in hanging out with you?
Nope. Purred like a kitten the whole way.

Quote:

Let me clarify: The ENGINE, not your WIFE.
If the answer to the above is "no", and you didn't notice any serious white smoke (diesel smoke is like marijuana: a whiff is okay, but when you start hacking and coughing and can't see for the smoke, you have a problem), then I would not be too worried.
There was some white smoke, more during the end of the trip than the beginning. Does that mean I've blown a head gasket or something?
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