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    New Motor-gctid819751

    I just had a rebuilt 5.9 Cummins 270hp installed and when you start it, it smokes , is this a common thing until it is broken it?

    #2
    Jim, I'm sorry I cannot expertly answer your question. However, it would not surprise me in the least that a diesel would smoke until the rings seat.
    Jim Gandee
    1989 3888
    Hino 175's
    Fire Escape
    [email protected]
    Alamitos Bay, SoCal

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      #3
      Jim,

      It has been my experience that Diesel engines smoke initially upon starting but should clean up after they get warm. That can take a minute or so. Certainly give it some time to break in. Was the fuel injection system rebuilt including injectors?
      Bob and Lulu
      1997 5788 'Starship' MAN 610s
      1996 3988
      1993 3058
      Vida, Oregon

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        #4
        Yes the fuel injection system was rebuilt including injectors

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          #5
          Every Cummins marine diesel I've ever had smoked on startup

          This should clear up as the engine warms up.

          Hopefully you were briefed on how to break in a Cummins engine.

          If not, its simple. Run the engine hard. Dont idle the engine, get after it when underway.

          KEVIN SANDERS
          4788 LISAS WAY - SEWARD ALASKA
          www.transferswitch4less.com

          where are we right now?

          https://maps.findmespot.com/s/36S4

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            #6
            From Tony Athens, Cummins rings are convex when installed and break in in about ten hours. Full flat wear can take up to 300 hours.

            Yes they all smoke on startup until warm.
            "Adios Dinero"
            1997 3988 with new 330 Cummins
            Photo Credit: Whiskywizard

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              #7
              Curious on why you had to replace your engine? I have same engines and would like to know. Thanks.
              Guntar
              1999 3988
              Cummins 270s

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                #8
                Water entered the starboard engine last winter from a sea surge.We are doing a sea trial Tues and I will post pictures later.

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