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Alpha One MCM 200 heat exchanger removal-gctid803182

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    Alpha One MCM 200 heat exchanger removal-gctid803182

    Hello

    I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

    Thoughts?
    ----------------------------------------------------------------------------------------------------------------------
    Ontario
    2016 170BR
    90 HP

    #2
    Yes, you can eliminate the Closed Cooling system..... but I would ask why?

    I would remove the H/E and have it repaired.

    It doesn't get any better than having a Closed Cooling System to protect your engine.

    Better for cabin heater and water heater use, no draining down of cylinder block during winterizing, no interior corrosion issues, etc.

    .

    .
    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

    Comment


      #3
      "heedrix" post=803182 wrote:
      Hello

      I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

      Thoughts?
      Belt driven engine mounted raw water pump on an Alpha?
      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

      Comment


        #4
        "heedrix" post=803182 wrote:
        Hello

        I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

        Thoughts?
        Belt driven engine mounted raw water pump on an Alpha?

        Are you loosing coolant? Pressure test the cooling system and find out where your issue is.

        PS- you'll likely loose some engine coolant (EG) during the overheating, you sure your impeller is pumping The proper volume?
        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

        Comment


          #5
          My first reaction to the op's naraitive is belt driven pump on an alpha??? There have been conversations, but it's not very common. That makes me wonder if he is misunderstanding the raw water cooling side of his closed cooling. Pictures would certainly help if there has been a conversion. Otherwise, Hedrix, do you know that there is a raw water pump in the drive? What kind/type of boat is your engine in?
          P/C Pete
          Edmonds Yacht Club (Commodore 1993)
          1988 3818 "GLAUBEN”
          Hino EH700 175 Onan MDKD Genset
          MMSI 367770440

          Comment


            #6
            Belt driven circulating water pump he meant to say most likely...
            Joon, Kathy, Jaden & Tristan
            Uniflite 42 AC, DD 671N
            93 3058 sold
            92 2855 (day boat)
            91 Fourwinns 205 (lake boat)
            Longbranch WA
            Life is Good

            Comment


              #7
              It's certainly a bit of a mystery, the OP refers to his engine driven pump pulling in lake water on a system that apparently has a heat exchanger fitted :whistle:
              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

              Comment


                #8
                Post some pictures because what you are saying is not the common setup. You have us confused as to how your boat is setup.
                1999 Bayliner Ciera 2655
                5.7 Bravo 3

                Comment


                  #9
                  "Ruffryder" post=803229 wrote:
                  Belt driven circulating water pump he meant to say most likely...
                  Alphas feed water comes from a pump in the lower outdrive......

                  Only pump on the engine is the normal circ pump for engine cooling.

                  But you knew that.
                  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."

                  Comment


                    #10
                    Hi Everyone

                    The engine is in a Cadorette Holiday 200. Here is a pic of the engine.




                    The bottom left pulley (which you can only see half of) is the circulating pump for the lake/raw water.

                    Heedrix
                    ----------------------------------------------------------------------------------------------------------------------
                    Ontario
                    2016 170BR
                    90 HP

                    Comment


                      #11
                      "heedrix" post=803929 wrote:
                      Hi Everyone

                      The engine is in a Cadorette Holiday 200. Here is a pic of the engine.

                      [attachment]35317 wrote:
                      $_27(6).JPG[/attachment]

                      The bottom left pulley (which you can only see half of) is the circulating pump for the lake/raw water.

                      [color]#000088 wrote:
                      That is your belt driven Seawater Pump!

                      The Engine coolant circulating pump is above that. [/color]

                      Heedrix
                      [attachment]35321 wrote:
                      seawaterpumpforheedrix.jpg[/attachment]

                      [color]#000088 wrote:
                      Back to post #1 for a minute.[/color]

                      "heedrix" post=803182 wrote:
                      Hello

                      I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine.
                      [color]#000088 wrote:
                      OK.... as mentioned, the Alpha drive's seawater pump is in the lower gear unit.

                      The seawater path from this pump also aids in the upper gear unit cooling.

                      Your engine is fitted with a belt driven seawater pump that provides seawater to the Heat Exchanger (actual engine cooling is via E/G coolant and the H/E).

                      You must keep the A drive seawater pump active in order to provide the upper gear unit cooling..... or, install a drive shower.... of which I don't actually care for!

                      [/color]

                      .
                      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

                      Comment


                        #12
                        "heedrix" post=803182 wrote:
                        Hello

                        I have a mercruiser alpha one mcm200 with a cooling system that has a heat exchanger. the water is drawn up from the lake, through a hose by a pump driven by the engine. Is there a way to remove the exchanger, to have the water from the lake directly cool the engine? I think the heat exchanger is cracked and coolant from the engine is mixing with lake water, causing the engine to over heat.

                        Thoughts?
                        Engine overheating:

                        -Test the flow rate from the belt driven engine mounted raw water pump,Rick marked with B. See chart for proper volume.

                        - Youre sure it's an Alpha drive? If so has the lower units impeller been removed to allow the engine mounted raw water pump to pull water through the drive? Or is the drive still pumping via the drive impeller and spitting back into the lake or are the "working" together?

                        -if I suspected a leak within the heat exchanger I would pressure test the cooling system.
                        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

                        Comment


                          #13
                          Having freaking difficulties again tryin to attach an image :S


                          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

                          Comment


                            #14
                            Thanks everyone! There's actually a hose that goes from the engine driven pump ( B ) to an intake from the bottom of the boat (indicated by the arrow)



                            ----------------------------------------------------------------------------------------------------------------------
                            Ontario
                            2016 170BR
                            90 HP

                            Comment


                              #15
                              "heedrix" post=804093 wrote:
                              Thanks everyone! There's actually a hose that goes from the engine driven pump ( B ) to an intake from the bottom of the boat (indicated by the arrow)

                              [attachment]35357 wrote:
                              engine.png[/attachment]
                              [color]#000088 wrote:
                              Yes.... that hose would be the lake/river/ocean water supply for the "seawater pump" ("B").

                              Where the red arrow points (and where this hose connects), you should have a "seacock" valve. (I.E., a valve to shut off the supply)

                              Also, since this is equipped with Power Assist steering, you should see the supply from the Alpha Drive seawater pump going to the Power Assist steering pump https://encrypted-tbn0.gstatic.com/s...ooler.</u></b>

                              I would like to know where this supply ends up after having passed through the fluid cooler!

                              [/color]
                              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

                              Comment

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