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    • Cummins Marine Forum Topics
    • QSC 8.3 RPM Surge

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 4 years ago

      September 6, 2019 at 7:34 am I have a single QSC 8.3 (2007 model with 2500 hours) that is experiencing infrequent and inconsistent RPM surges of 30 to 40 RPM. Engine has a Morse KE-4 electronic engine control and also the CM SmartCraft instrumentation. I generally run the engine at 1300 RPM for 7 to 8 knots and a resultant 3.6 gallon/hour fuel consumption. When it surges it will pop up to 1340 or so then fall back to 1300. It never fluctuates downward. The previous owne…

      Started by: Steven Williford in: General Discussion

      1 Reply
      September 6, 2019 at 6:30 pm What type of digital displays do you have? Bring of the screen that shows throttle %, and watch that during the RPM fluctuations…………….If it changes, then you have an KE-4 issue.. If not,then I’d say you have an engine issue or sensor issue. Tony

      Last Post by: Tony Athens posted: 4 years ago

    • QSC 8.3 Blow by and oil loss

      This topic has 2 replies, has 2 voices, and was last updated bySteven Williford 4 years ago

      July 30, 2019 at 1:59 pm I have a 2007 vintage QSC 8.3 engine in our North Pacific 52′ trawler. The engine has 2300 hours and is a 540hp rated engine. In the 16 months of my ownership there has never been a drop of oil, coolant or raw water under the engine. We just returned from a two month cruise to northern British Columbia and I put over 120 hours on her in the two months. I generally check the engine space and fluids every day or two and last week when we…

      Started by: Steven Williford in: Cummins Marine Engines

      2 Replies
      July 31, 2019 at 8:25 am Andre, Thank you for your response. I think the dipstick is the most likely problem. This event only happened when the dipstick wasn’t thoroughly inserted into the tube. I will become much more vigilant on checking the engine and the position of the dipstick and will run her under load for a couple of hours and confirm that nothing is amiss. Your response has certainly helped to belay my worse fears. Thanks again. Steven

      Last Post by: Steven Williford posted: 4 years ago

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