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Changing The water pump on 350 MPI mercruiser

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    Changing The water pump on 350 MPI mercruiser

    Hi
    Does anyone know the OEM part no for the 350 Mercuiser water pump assembly,
    and do you have to take the boat out of the water to change the pump over, if not what is the procedure
    Thanks

    #2
    Originally posted by Gregg View Post
    Hi
    Does anyone know the OEM part no for the 350 Mercuiser water pump assembly,
    and do you have to take the boat out of the water to change the pump over, if not what is the procedure
    Thanks
    You didn’t say but being a 350 MPI I’m assuming it’s connected to a Bravo drive. All Bravos use the same water pump impeller. You’ll need to block off the input hoseto ensure water doesn’t come in.
    1997 Maxum 2400 SCR 5.7LX Bravo II

    Mike

    Comment


      #3
      Raw water pump or engine circ pump? Closed cooled or raw water cooled?
      Dave
      Edmonds, WA
      "THE FIX"
      '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
      (.030 over-Vortec top end-part closed cooled)
      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
        Originally posted by Gregg View Post
        Hi
        Does anyone know the OEM part no for the 350 Mercuiser water pump assembly,
        and do you have to take the boat out of the water to change the pump over, if not what is the procedure
        Thanks
        I agree with Mike and Dave....... we need more info, Gregg.

        The GM pump on the front of the engine is the "Coolant Circulating Pump".
        The Mercruiser pump is the "Seawater Pump"!

        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


          #5
          Hi
          The engine uses raw sea water drawn from the stern drive it is an open system
          The pump is leaking at the pulley , it sits on the right hand side of the engine, facing the front of the boat, down the bottom underneath the alternator
          thanks

          Comment


            #6
            Post #2
            heres the Mercruiser housing and impeller kit but sounds like you may need the shaft seal.

            https://www.michiganmotorz.com/mercr...ng-p-1206.html
            Dave
            Edmonds, WA
            "THE FIX"
            '93 2556 5.7 Bravo II 2.0:1 18 1/4x19 P
            (.030 over-Vortec top end-part closed cooled)
            The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
            Misc. projects thread
            https://www.baylinerownersclub.org/f...56-gctid789773

            Comment


              #7
              Suggestion:
              Rid yourself of that over-priced, silly configuration, time consuming impeller replacement, OEM belt driven seawater pump and install a crankshaft pump in it's place.
              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


              • builderdude
                builderdude commented
                Editing a comment
                Good suggestion Rick but he may lack the space needed. Op never gave us any year, make, or model
                ​​​​​​​

              #8
              Originally posted by 2850Bounty View Post
              Suggestion:
              Rid yourself of that over-priced, silly configuration, time consuming impeller replacement, OEM belt driven seawater pump and install a crankshaft pump in it's place.
              If the OP is interested, I made this switch on my last boat and documented it here including all the parts required. The pulley driven pumps fail frequently and need to be rebuilt. The crank driven pumps last longer and are much easier to service. In the end, it was actually less expensive to make the switch to a crank driven pump.

              https://www.baylinerownersclub.org/f...pi-gctid406273
              Terry
              1999 Bayliner 3388
              Twin Cummins 4BTA
              Fisherman, Cruiser, Boaticus-enthusiasticus-maximus
              Member Royal Victoria Yacht Club

              Comment


                #9
                Had the same leak at the sea water pump shaft seal last summer. Mechanic changed out the whole thing - Pulley, housing, and impeller while the boat was in the water - assume he slipped a black garbage bag over the drive to prevent water from coming in. Parts and labor $500
                Ted
                2005 288 Command Bridge
                350 Mag MPI / BRAVO III

                Every Day Is Saturday

                Comment


                  #10
                  Thanks for that info
                  I will now consider my options

                  Comment

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