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    • Cummins Marine Forum Topics
    • Losing coolant

      This topic has 12 replies, has 7 voices, and was last updated byrod-3565 3 years ago

      November 15, 2018 at 9:16 am I’m having an issue with losing coolant on a cummins 6bta. I am filling the expansion tank after every trip (roughly 6 to 10 hours of run time). The engine maintains a normal operating temperature throughout the trip even though at some point, the expansion tank is empty. I did notice that the overflow tank is pretty full with antifreeze if that could be a symptom. History – Last year we had an overheat due to a failed water pump (e…

      Started by: Ron in: Cummins Marine Engines

      12 Replies
      October 20, 2020 at 11:34 pm donald roth wrote: Can you see bubbles in the expansion tank when running? Have you pressure tested coolant system? You can rent a coolant tester from your local auto parts store to see if there are hydrocarbons in your coolant, usually a sure sign of head gasket failure. This needs immediate attention, if a cylinder fills with coolant, somethings gonna go BANG on the next startup. Thats fantastic information thanks. I ll double check all those…

      Last Post by: rod-3565 posted: 3 years ago

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