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Smoking Diesel #9139
03/22/10 09:34 AM
03/22/10 09:34 AM
Joined: Apr 2003
Posts: 649
Marblehead, MA
dbows Offline OP
Senior Member
dbows  Offline OP
Senior Member
Joined: Apr 2003
Posts: 649
Marblehead, MA
So my engine over the last season and a half has started to put out quite a bit of soot. I would say smoke but it does not really smoke more than it has in the past. The difference is that just at fast idle I do not really see any smoke but the transom gets covered with soot. And this can happen with just a hour of fast idle to charge the batteries.

I have changed the oil, cleaned the oil filter, changed the air filter and treated the fuel.

Any other suggestions?


David Bows
Mallorca - Hull# 397
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Re: Smoking Diesel [Re: dbows] #9142
03/22/10 09:49 AM
03/22/10 09:49 AM
Joined: May 2007
Posts: 2,668
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,668
Portsmouth, RI
You may have a clogged injector so that the fuel isn't atomized completely. Try pulling the injectors and cleaning the tips. You can probably just clean them up carefully with a wire brush and solvent. In the worst case, you may actually see a charcol briquette stuck by the pin hole where the fuel gets atomized. There is a picture on page 42 in the Yanmar Operators manual on what the spray should look like. A diesel repair shop can "pop test" the injectors.

Re: Smoking Diesel [Re: Rhapsody #348] #9161
03/25/10 10:47 AM
03/25/10 10:47 AM
Joined: Jan 2009
Posts: 140
New Orleans, LA
Rambunctious Offline
Senior Member
Rambunctious  Offline
Senior Member
Joined: Jan 2009
Posts: 140
New Orleans, LA
If it's accumulations of soot, then I would also suspect the mixing elbow - that can accumulate carbon and restrict the elbow. You can remove the piece, soak it in oxalic acid, clean and stick it right back on (they can be a bear to remove).

Just running the motor at a fast idle to charge batteries is really, really tough on a diesel. They need to be under load. Using the motor to charge to batteries or chronically under-revving it (lots of people cruise at 1500 or 1600 RPM thinking they're going easy on the motor) can cause a condition called "wet stacking" that will accumulate unburnt fuel components on the exhaust side of the motor and on the cylinder walls. It will eventually damage a motor and shorten its life.

If that is really your only way to charge the batteries, try putting the boat in gear when possible.

Re: Smoking Diesel [Re: Rambunctious] #9162
03/26/10 08:40 AM
03/26/10 08:40 AM
Joined: Apr 2003
Posts: 649
Marblehead, MA
dbows Offline OP
Senior Member
dbows  Offline OP
Senior Member
Joined: Apr 2003
Posts: 649
Marblehead, MA
Jason - It is not often that I charge the batteries that way and I like to drive the engine about 2400 rpm. I think I will take my mixing elbow off and give it a clean - as well as give the injectors a quick clean.

Thanks for the help.

David


David Bows
Mallorca - Hull# 397
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