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    • Cummins Marine Forum Topics
    • On going ECM / Insite problems.

      This topic has 8 replies, has 4 voices, and was last updated byRob Baker 10 months ago

      September 28, 2020 at 6:34 am Good day, I have had problems with insite program running the cylinder cut out diagnosis. The program simply locks the test out without any spacifics as what was the cause. I had cummings up date the origional ECM which did not solve the problem. Recently Cummins replaced the ECM with a new unit and the cylinder cut out test remains locked out. Cummins seems to be at an impasse. Anyone ever have this problem ?

      Started by: Rob Baker in: Cummins Marine Engines


      8 Replies
      at

      Last Post by: Anonymous posted: 10 months ago

    • Throttle flat spot

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 10 months ago

      May 2, 2023 at 4:46 pm My QSC 8.3 has developed a intermitant flat spot when rolling power on.  Suddenly rpm stops climbing. Advancing throttel further has no effect and suddenly an explosive rush of power. Happened three times in 600nm trip. Engine has 1320 hours , uses no oil and tempatures all in range. Boost pressure however varies up to 10# at constant RPM. No obvious boost leaks but suspect condensation drain might be stuck open. Could it effect boost pressure b…

      Started by: Rob Baker in: Cummins Marine Engines


      1 Reply
      May 4, 2023 at 8:43 pm A bad condensation drain could do that if indeed you are getting a 10PSI drop from the leak — Cap it for a few trips and see if that solves the issue–Remember pressures in there can be  20PSI ++

      Last Post by: Tony Athens posted: 10 months ago

    • Cylinder cut out test locked out

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 3 years ago

      August 27, 2020 at 8:10 am I have a head scratcher issue here. Qsc 8.3 has a miss at rpm above 1200. Had Cummins diagnose with insite program but cylinder cut out test is locked out. No explanation on why. Engine at temp but no good. Cummins tested ECM and brought up to date with latest cals. Still nothing. Engineering analyzed raw data and found instability in rail pressure realitive for ECM requests. Changed pressure actuator and engine became smoother but produced whit…

      Started by: Rob Baker in: Cummins Marine Engines


      1 Reply
      August 29, 2020 at 9:37 am Single or twin engine boat? If twin and the other engine runs good, then start swapping things. ECM 1st. If not, then you do not have much of choice that to decide what to start with–ECM, injectors, another NEW Fuel actuator ( we have seen a 50% ++ failure rate on the last 10 new engines start-ups engine lately). Researching this after really getting pissed off turned up that this goes back a few years. Some bad batches out there. If t…

      Last Post by: Tony Athens posted: 3 years ago

    • Rubber strips removal of aftercooler core on qsc 8.3

      This topic has 3 replies, has 3 voices, and was last updated byTony Athens 4 years ago

      May 11, 2019 at 4:58 am I have noticed some advocate removal of the four rubber vanes that run the length of the aftercooler core. Does anyone know why this practice is recommended?

      Started by: Rob Baker in: Cummins Marine Engines


      3 Replies
      May 12, 2019 at 6:33 pm Just an IMO——Silicone strips on aftercooler cores… — Just a “dream” that does not work in field service .. That is what matters, not what’s in the paper engineering and what could happen in a test cell environment under very controlled conditions………… Tony

      Last Post by: Tony Athens posted: 4 years ago

    • Qsc 8.3 clamps

      This topic has 4 replies, has 2 voices, and was last updated byRob Baker 4 years ago

      May 7, 2019 at 11:22 am Hello, doing a rebuild on aftercooler on qsc 8.3 and have a bunch of rusted clamps stamped with 4003347. Would like to replace these clamps with new but cant seem to identify a source. Any help is appreciated.

      Started by: Rob Baker in: Cummins Marine Engines


      4 Replies
      May 9, 2019 at 4:51 am Thanks, I will give them a call.

      Last Post by: Rob Baker posted: 4 years ago

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