Cummins 903 smoking

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charliebabb

Cadet
Joined
Dec 6, 2012
Messages
17
Hey guys, Im having a problem with my twin 903 Cummins in my 1976 42' Hatteras. The starboard engine barely spits out any smoke where as the port smokes a lot. I replaced the turbo on the port motor and it didn't help. Could it be injectors?

Thanks for the help in advance.
 
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sean mathews

Cadet
Joined
Sep 19, 2012
Messages
29
Re: Cummins 903 smoking

black generally indicates an excess of fuel. could be one or multiple injectors have broken tips or the fuel pump is out of wack. i suggest talking to a diesel injection shop
 
QC

QC

Supreme Mariner
Joined
Mar 22, 2005
Messages
22,783
Re: Cummins 903 smoking

Losing an injector tip will result in a much bigger problem than black smoke ;)
 
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rthomas

Petty Officer 2nd Class
Joined
Nov 9, 2007
Messages
155
Re: Cummins 903 smoking

Does it smoke at all throttle/load positions? If thats the case and it seems to run ok I would look at injection timing, retarded timing will make smoke and high EGT, another symptom of this can be if the motor is a little quieter or different sounding than the other one. If you had a bad injector you would have a few other symptoms like missing or a knocking sound.
 
tanderson2002us

tanderson2002us

Cadet
Joined
Jul 6, 2012
Messages
9
Re: Cummins 903 smoking

My boat is a gasser but my pulling rig is an 02' Cummins......all those replies sound spot on.
 
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