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    Eng Temp-gctid384671

    What temp should the engine run at on a 1998 Mercruser with a Chevy 5.0? What is the thermostat rating?

    #2
    Impossible question to answer without more info!

    Which 5.0L fuel delivery system?

    FI with temp sensing.... or carbureted?

    Salt water.... or River/Lake water use?

    Open or Closed Cooling system?

    You are correct by asking, and correct by running a thermostat.

    DO NOT run without a Thermostat.... no matter who may suggest otherwise..... and/or what you may read!

    No boat nor engine builder will suggest running our engines without the correct temperature thermostat installed.

    .
    Rick E. Gresham, Oregon
    2850 Bounty Sedan Flybridge model
    Twin 280 HP 5.7's w/ Closed Cooling
    Volvo Penta DuoProp Drives
    Kohler 4 CZ Gen Set

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      #3
      1998 5.0 Chevy, carb, open cooling in fresh water

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        #4
        My 2000 runs right at 172 degrees
        Boatless at this time

        A veteran is someone who, at one point in their life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including their life."

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          #5
          I've found online that the thermostat is a 160. My gauge says 175 so I might be running hot. I will first install a new tstat and if that doesn't work, what next? What all can I do without pulling the boat out of the water? Can I flush / clean out the cooling system with the boat in the water.

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            #6
            seasam wrote:
            I've found online that the thermostat is a 160. My gauge says 175 so I might be running hot. I will first install a new tstat and if that doesn't work, what next? What all can I do without pulling the boat out of the water? Can I flush / clean out the cooling system with the boat in the water.
            You should be running ~175 with a 160 thermostat. You don't need to do a thing.

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