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    • Cummins Marine Forum Topics
    • Cummins QSB 480 – Raw Water Pump

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 5 years ago

      August 13, 2018 at 7:24 pm Found that I am experiencing a raw water leak from the pump on my port Cummins QSB 480 engine (570-hrs). At low RPM there isn’t any leak however as I raise the RPM I can see the dripping from somewhere on the pump – I do see about a 1-2 gallons of water in my bilge following a 2-3 hour run and now realize it’s from this pump. I took off the black fan belt cover and noticed water hanging from the bottom of the pump housing. I…

      Started by: Kevin French in: Cummins Marine Engines

      1 Reply
      August 14, 2018 at 4:39 am This is the factory Sherwood QSB pump and the water seal design have a dismal history of acceptable life.. Solution: It’s a new pump or a rebuild………… In the mean time, mitigate the saltwater damage to the engine mount, etc below the pump.. Damage is happening as I write. Below is what will happens if you do not address the issue.. UGLY! Have you serviced your aftercoolers? Do you know what “Marine Age”…

      Last Post by: Tony Athens posted: 5 years ago

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