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    Cooling System-gctid821506

    I just recently acquired a 1989 Trophy 2459 Offshore which is powered by the 5.8 Cobra. The boat has spent the past 28 years on Lake Ontario and I have just brought her out to the West Coast where she will live in The Pacific Ocean. My question is... Does anybody run a raw water cooled boat in salt water and if so, what life expectancy can I expect on the engine?
    The " Jeanne D " is a 1989 2459 Trophy Offshore
    Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
    Victoria, B.C.

    #2
    There are many boats that run a raw water cooled system in salt and live long lives with proper maintenance. With that said, I personally think a closed cooled system is far superior for a couple of reasons: 1) Corrosion protection of the engines internal water jackets. 2) A simpler process when it comes to winterizing the engine.
    Dave
    Edmonds, WA
    "THE FIX"
    '93 2556
    Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

    The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
    Misc. projects thread
    https://www.baylinerownersclub.org/f...56-gctid789773

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      #3
      I agree, but the reason I am asking is that the boat is 28 years old and I have no idea how many hours are on her. So not knowing how much life is left in her engine I am waying the option of getting some good years out of her without the expense of installing a heat exchanger.
      The " Jeanne D " is a 1989 2459 Trophy Offshore
      Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
      Victoria, B.C.

      Comment


        #4
        I agree mine (same boat) has a closed system. Much better for the internal life and ability to run a constant temp. That said imho the weak link is the manifolds whic are cast and have narrow ports for water flow therefore clog up. The new "saltaway" type products are miraculous at removing salt residue and a must use when flushing drive and motor. The exhaust manifolds are NOT available so center discharge swap would be next if they are corroded. bla bla bla. came from fresh if it was flushed it should be good to go. Again "saltaway" or west marine has a clone product for flushing after use will keep it clean as a whistle. Pull the exausts and inspect regularly depending on use. Come to Santa CruzB) B) B) B) B) B)
        I live in Santa Cruz Ca
        1989 trophy 2459 hardtop with omc 5.8L (5.97l now) fresh and closed cooling system w/ OMC cobra stern 15 Evinrude kicker.
        I fish inshore rock, halibut, salmon and tuna within range. Fish Monterey and Half moon bay Calif. Had boat 15 years. Pretty handy.

        Comment


          #5
          I had a 1990 2755 raw water cooled which lived in fresh water from new through 2007 when we took it south with us to the Atlantic coast. I was the 2nd owner bought the boat in 2001 and as far as I knew, risers and manifolds were original. It lasted about 3 years in the salt before starting to overheat. Changed risers and manifolds and it was fine for another 3 years until I sold it. Never had an overheat problem again and subsequent owner never did either as far as I followed it. You will find that risers and manifolds become a 5 year maintenance item in salt water whereas many raw water cooled boats live long lives in freshwater without having to change out those parts. Although the salt probably began to clog the interior engine passages, I never experienced an overheat with the new risers and manifolds installed. Just plan on changing them out every 5 years. You might get longer life out of them if you flush with salt away every time you run the boat. I kept the,boat in a slip the first year then moved to a dry stack and it was flushed with fresh water after each use when in the dry stack

          Perhaps of more importance is your zincs and outdrives. Salt just eats them up. When I had our boat docked full time vs in the dry stack, I had to have new anodes installed every season. They were gone by the end of the year so keep an eye on them. Also in the slip I had to have a diver clean the bottom and outdrive every other week. It would accumulate enough growth that it would not get up on plane if it wasn't cleaned regularly. Imo if you can dry store the boat it will require less maintenance and be easier on the boat overall.
          1990 2755 - sold
          2005 275 - sold (now boatless)

          Comment


            #6
            If you love your 2459 as much as it appears you do, show it the respect it has earned and FULL CLOSE COOL it.


            Attached files

            " WET EVER "
            1989 2459 TROPHY OFFSHORE 5.8L COBRA / SX
            mmsi 338108404
            mmsi 338124956
            "I started with nothing and still have most of it left"

            Comment


              #7
              I converted my old 5.0 from raw water cooling (saltwater) to full cooling. I flushed the engine with acid and then installed a couple of dirt collectors on the risers/exhaust manifolds. These things were made of bronze and with a small stainless filter inside, just unscrew the top and clean the filter if needed, no debris in the heatexchanger.

              Well worth it to install full cooling.
              1995 Bayliner 2452
              Alpha 1 Gen II
              2016 - 5.7 Vortec 4BBL
              Full Closed Cooling

              Comment


                #8
                Had a 86 lived a trailer queen life, only saltwater, flushed after use had the original mani every 5 years new elbow, sold it.

                Flush every time.
                Be good, be happy, for tomorrow is promised to no man !

                1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

                '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

                Manalapan N.J

                Comment


                  #9
                  Thanks for your valuable advice! Much appreciated.
                  The " Jeanne D " is a 1989 2459 Trophy Offshore
                  Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
                  Victoria, B.C.

                  Comment


                    #10
                    Unfortunately it will live in a slip.
                    The " Jeanne D " is a 1989 2459 Trophy Offshore
                    Powered by 5.8L. Member of C.F.B. Esquimalt Power Boat Club
                    Victoria, B.C.

                    Comment


                      #11
                      you can flush in the slip.
                      Be good, be happy, for tomorrow is promised to no man !

                      1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

                      '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

                      Manalapan N.J

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