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135 Hino overheating-gctid816661

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    135 Hino overheating-gctid816661

    I have a 3218 motor yacht with 135 hinos. Last week my port engine overheated on the way back to the marina so I shut it down and the strainer was full of sea grass.

    Since then I cleaned out the strainer, changed the impeller, changed the oil checked the belt but it still heats up to 200 . I'm suspecting the heat exchanger , riser or thermostat. Is there any quick fix? Also there is a bleed fitting beside the riser. Should be bleeding air out of the cooling system while it's running?

    #2
    Your raw water intake could still be clogged with sea grass. At least that's my first reaction. Did you have any grass in the pump? No need to bleed anything after the pump, and its self priming. Were it me, I'd be looking for a safe way to back flush the raw water intake.
    P/C Pete
    Edmonds Yacht Club (Commodore 1993)
    1988 3818 "GLAUBEN”
    Hino EH700 175 Onan MDKD Genset
    MMSI 367770440

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      #3
      "Pcpete" post=816683 wrote:
      Your raw water intake could still be clogged with sea grass. At least that's my first reaction. Did you have any grass in the pump? No need to bleed anything after the pump, and its self priming. Were it me, I'd be looking for a safe way to back flush the raw water intake.
      +1 - sounds just like a raw water flow issue. If you must mess with the thermostats please note they are dual blade designs and repacking them with the wrong units will cause real problems. Best to work through the water flow issues until you are 100% sure that is not the problem.
      Northport NY

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        #4
        After closing the seacock I'm going to remove some raw water hoses to see what's clogged. I squeezed the hose coming off the heat exchanger (stern) and it felt like something was in there.

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          #5
          been there done that twice, if your cap on the screen intake is or can suck air your brand new pump will not do its job, may need a new cork gasket between your glass and cap.
          1988 3270
          135 hinos
          Seldovia ALASKA
          KEVINS UPHOLSTERY
          KEVINSBOATTOPS.COM
          Marine canvas/Upholstery
          since 1975

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            #6
            Don't forget to check your transmission cooler for clog as well
            James
            Kai Nani, Redondo Beach, CA
            1989 MY 3288
            Hino 150hp with Hurth 630A Trannies

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              #7
              You may need to check the intake on the hull as well in case something is restricting the flow.
              "Martini's Law"
              1986 Bayliner 3270, 110 Hino's
              Nova Scotia, Canada

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                #8
                I think I've found the problem. Seagrass clogging the intake. Unfortunately it also destroyed my new impeller.


                Attached files

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                  #9
                  I didn't realize there should be a gasket there, it's definitely missing.

                  Comment


                    #10
                    "SeaQuest" post=816801 wrote:
                    I didn't realize there should be a gasket there, it's definitely missing.
                    It is better to replace the old cork gasket with a new rubber gasket if you can find one. If you have not had a gasket you are not pumping enough water and potentially destroying impellers.
                    Started boating 1965
                    Bayliners owned: 26 Victoria, 28 Bounty, 32, 38, and 47 since 1996

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                      #11
                      Actually there is a gasket but it wasn't noticeable.

                      I might make my own gasket.

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