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Troubleshooting diesel engine stall under load

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    #61
    This is what I installed Pete.

    https://www.aetnaengineering.com/mod...cd-tachometer/
    Jim Gandee
    1989 3888
    Hino 175's
    Fire Escape
    [email protected]

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      #62
      Originally posted by infy View Post
      Got new air filters on. They look great! But it's still showing that smoke when approaching 2k RPM.

      It also occurs to me that the smoke (pictured in attachments above) could be just normal water vapor from combustion? What do you guys think? Is it too much smoke from twin 8 liter V6 diesels near WOT?

      I have no experience with this type of engine or boat as a baseline. I know that if I send my car (gasoline 4.4 twin turbo V8) I'll have extra water vapor out the tailpipe.
      Congratulations on remediating your engine stall/rpm issue.
      You now are trying to address the smoke that you see.
      You will find that in order to solve this there are many of the same concerns as before so please reread the posts for clarity:
      - are your reaching WOT +3-5% when fully loaded on a hot and humid day?
      - are your tachs known accurate
      - is your fuel in good shape
      - when was your last valve adjustment
      - when did you last time your fuel injection pump
      - how many hours use since your fuel injectors were serviced

      I would start at the top of the list in searching for a black smoke issue ...

      Northport NY

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        #63
        Originally posted by smitty477 View Post
        - are your reaching WOT +3-5% when fully loaded on a hot and humid day?
        Seattle area. Nope.

        Originally posted by smitty477 View Post
        - are your tachs known accurate
        Nope. But they're getting replaced soon with a hall sensor and new tach.

        Originally posted by smitty477 View Post
        - is your fuel in good shape
        Unknown. It's dyed red for some reason. Red suggesting possibly kerosene additive?

        Originally posted by smitty477 View Post
        - when was your last valve adjustment
        Unknown.

        Originally posted by smitty477 View Post
        - when did you last time your fuel injection pump
        Hm? What about the fuel injection pump?

        Originally posted by smitty477 View Post
        - how many hours use since your fuel injectors were serviced
        Judging by the color of the fuel injectors... they're probably originals that came with the boat in 1989. The bolts have scars so someone has likely serviced them to some degree.

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          #64
          If you don't have records indicating new or rebuilt injectors, I suggest you get them done. When I bought my boat one engine appeared to have original injectors, while the other one appeared to have injectors that were changed. As a result of a hard starting issue I changed the ones that looked original. About a year later the other engine had high blow-by. A compression test revealed one bad cylinder and the engine had to come out. The worn cylinder resulted from a bad injector.
          1999 3788, Cummins 270 "Freedom"
          2013 Boston Whaler 130 SS
          Anacortes, WA

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            #65

            Originally posted by smitty477 View Post
            - are your reaching WOT +3-5% when fully loaded on a hot and humid day?


            Seattle area. Nope.
            1st step is to always make sure you can reach rated WOT plus 3-5% of rated rpm


            Originally posted by smitty477 View Post
            - are your tachs known accurate



            Nope. But they're getting replaced soon with a hall sensor and new tachs
            Good - that will allow you to review and record your correct rpm for baseline and future diagnostics


            Originally posted by smitty477 View Post
            - is your fuel in good shape


            Unknown. It's dyed red for some reason. Red suggesting possibly kerosene additive?
            Red just means it is not intended for road use (taxable) - fuel condition can play a role in diesels when it is fairly old.


            Originally posted by smitty477 View Post
            - when was your last valve adjustment


            Unknown.
            Incorrect Valve clearances can cause smoking and inefficient operation


            Originally posted by smitty477 View Post
            - when did you last time your fuel injection pump


            Hm? What about the fuel injection pump?
            The fuel injection pump requires checking and/or adjustment for correct injection timing for best use- incorrect timing can cause smoke and larger problems


            Originally posted by smitty477 View Post
            - how many hours use since your fuel injectors were serviced


            Fuel injectors are the key ingredient in efficient fuel burn - most often they need to be checked/adjusted at 1,000 hrs or less. A typical injector check rebuild is less than $100 each when pulled and brought in by an operator that is handy with tools ...and it will pay for itself in fuel savings alone.
            If there are no records on injector servicing and the hours are higher than 800-1,000 suggest you give this area attention.





            Northport NY

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