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    • Cummins Marine Forum Topics
    • Coolant Loss Troubleshooting

      This topic has 2 replies, has 2 voices, and was last updated byJeffrey Cohen 1 year ago

      March 10, 2023 at 12:21 pm Background: Port engine currently has 959 hours on it. Approximately, 173 hour ago @ 780 hrs (1.5 seasons) my port exhaust manifold failed causing an overheat condition. (never got an alarm but the code was there).Ā  The end result was having to have the head milled 17/1000ths (it was during covid and replacements parts were not available) and replacement of the heat exchanger (used part with similar hours…best available at the time).Ā  Sinc…

      Started by: Jeffrey Cohen in: Cummins Marine Engines

      2 Replies
      March 11, 2023 at 3:06 pm They are QSB 5.9 425HP Really hard to get a good picture while in the boat but hopefully these get you want you need.    

      Last Post by: Jeffrey Cohen posted: 1 year ago

    • Loss of Power

      This topic has 10 replies, has 4 voices, and was last updated byTony Athens 5 years ago

      July 29, 2018 at 3:15 pm I have 2008 5.9 QSBs (425hp) with approx 650 hrs and the port engine just developed an issue. So here’s the situation: Day -7: Rough trip back to the dock in rough/choppy bay but everything seems ok (seat of the pants assessment but I wasn’t looking for an issue). Day -1: 1 hr run to marina and noticed that both engines seemed to be ‘off’ (boat not traveling at usual speed at usual RPMs and GPH slightly elevated) but ca…

      Started by: Jeffrey Cohen in: Cummins Marine Engines

      10 Replies
      July 31, 2018 at 7:00 pm Loose Boost = ECM limits fuel = limits HP = LIMITS RPM. Tony

      Last Post by: Tony Athens posted: 5 years ago

    • Oman MDKBL-5791480 Heat Exchanger

      This topic has 5 replies, has 5 voices, and was last updated byJavier 6 years ago

      December 9, 2017 at 9:00 am Need a little advice… I have the Onan MDKBL-5791480 with 920 hrs (in 2008 boat powered by QSBs with 600 hrs) and I removed the heat exchanger to get at bits of impeller that have broken free over the years. Now that I have it out should I just pressure test it, paint and reinstall if all is ok or should I just replace it with a new one? What’s the life span of these anyway? TIA Jeff

      Started by: Jeffrey Cohen in: General Discussion

      5 Replies
      January 28, 2018 at 3:56 pm Hola buenas soy nuevo por aquĆ­ .Yo tambiĆ©n tengo el mismo generador y cambio el zinc cada aƱo y los filtros de gasoil y aceite,cambio de aceite cada 2 aƱos y la correa y el rodee cada 3 aƱos y va todo perfecto,tambiĆ©n lodesmonte una vez para quitar restos del rodee roto, se limpiĆ³ volviĆ³ a montarlo y todo perfecto. Saludos

      Last Post by: Javier posted: 6 years ago

    • Oil Leak – QSB 5.9 – Front

      This topic has 3 replies, has 2 voices, and was last updated byRob Schepis 6 years ago

      November 18, 2017 at 4:04 pm I have a small seepage of oil somewhere on the lower front of my starboard engine. It’s not much right now (never had to add oil) but I suspect it will get worse over time. Anyway, is there any chance this is anything than the front main seal? If so what else could it be? If not, is this seal replaceable without dropping the oil pan? If so, what is the process? Any advice on next steps while the boat is on the hard? TIA Jeff the line on…

      Started by: Jeffrey Cohen in: Cummins Marine Engines

      3 Replies
      November 19, 2017 at 11:29 am Front seal leak is rather uncommon as far as I am aware. It is done thru the front cover, the pan stays put. Hmm, if pics are difficult access may be an issue. Need to pull the crank pulley at a minimum. Those who are fluent at doing this can do with the timing cover in place, otherwise all gets stripped from the front of the engine and the timing cover gets removed. I would be 100% as to identifying the source before tearing into it. Is y…

      Last Post by: Rob Schepis posted: 6 years ago

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Viewing 4 topics - 1 through 4 (of 4 total)