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    Confused ?

    Have a 1991 bayliner trophy 24 ft, mercruiser 305 cid ,mercruiser alpha 1 outdrive. closed cooling for block, salt water cooled manifolds and risers. In a covered heated garage. Pulled out of garage a few days ago and started right up with muff.Most all exhaust water was coming out of the port side, very little coming from the starboard side. Stbd Riser was hot to the touch, Port riser was cool. New mercruiser manifolds and risers 4 years ago. Removed starboard side manifold and riser. Still looked brand new inside. No corrosion at all. Replaced with new gaskets. Hooked up the muff again and restarted. Now most of the exhaust water is coming out of the starboard side and just a trickle out of the port side, totally opposite from the previous day. Port side riser is hot and stbd is cool. Nothing else was changed or worked on. Don't know what to look for at this point.

    #2
    Checked flappers and seemed ok.

    Comment


      #3
      Try running it at 1200-1500 rpm when on the muffs.
      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


      • pilchrod
        pilchrod commented
        Editing a comment
        Probably be a couple hours yet and will try this. Crew is worn out and still in bed. lol

      • pilchrod
        pilchrod commented
        Editing a comment
        Ran it 1500 rpm for 10 minutes. both manifolds and risers were about the same temp. the exhaust elbow difference was 25 degrees on both sides at the very top of the exhaust elbows. High temp there was 225 degrees.

      #4
      It may be the impeller is worn or damaged and not pumping enough water for full flow to both sides...


      NU LIBERTE'
      Salem, OR

      1989 Bayliner 2556 Convertible
      5.7 OMC Cobra - 15.5x11 prop
      N2K equipped throughout..
      2014 Ram 3500 crew cab, 6.7 Cummins
      2007 M-3705 SLC weekend warrior, 5th wheel
      '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
      Heavy Equipment Repair and Specialty Welding

      Comment


        #5
        Turned the muff around and started it. All the conditions from my original post have reversed again! Port side is cool, stbd side is hot. 50 degree temperature difference on the exhaust elbows

        Comment


          #6
          Sounds like some floating debris... if havent swapped impeller I would start there
          2008 H210SS Four Winns
          Volvo Penta 5.7 GISX
          Prior: 1997 2050SS Bayliner
          Brad / Texas Gulf Coast

          Comment


            #7
            I'm starting to believe it is impeller related.

            Comment


              #8
              You need to take real readings with an IR temp sensor of the manifolds and elbows. Is the boat sitting level?
              1997 Maxum 2400 SCR 5.7LX Bravo II

              Mike

              Comment


              • pilchrod
                pilchrod commented
                Editing a comment
                The boat is level, the readings were with an ir temp sensor. the manifolds and risers were not hot.

              #9
              225 degrees is way to hot for the exhaust. What is the engine reading on the closedcooling side?
              1997 Maxum 2400 SCR 5.7LX Bravo II

              Mike

              Comment


              • builderdude
                builderdude commented
                Editing a comment
                Yep, 225 is not good, should be able to keep your hand on it no problem.

              • pilchrod
                pilchrod commented
                Editing a comment
                around 160-165 degrees on engine

              • Nauti_Mike
                Nauti_Mike commented
                Editing a comment
                Ok engine temp is good but exhaust should be around 120 +/- 10 degrees.

              #10
              Try removing the raw water inlet hose to the heatexchanger to see if it can fill a 5 gallon bucket in a minute or two. If not either the impeller is bad or there is a blockage.
              1997 Maxum 2400 SCR 5.7LX Bravo II

              Mike

              Comment


                #11
                I agree with Mike, do an impeller flow test and also take note of any debris in the exchanger.
                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


                • Nauti_Mike
                  Nauti_Mike commented
                  Editing a comment
                  Dave what’s the proper flow measurement per time? you have posted a chart before.

                #12
                Going to change the impeller and work from there. It hasn't been changed in several years. No parts available until tomorrow. Thanks for all the guidance and will post results when available.

                Comment


                  #13
                  Click image for larger version

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                  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


                    #14
                    Originally posted by builderdude View Post
                    Click image for larger version  Name:	image.jpeg Views:	21 Size:	136.8 KB ID:	527804
                    Our seawater pumps are RPM driven.
                    Flow becomes greater with increases in RPM, and flow diminishes with decreases in RPM.


                    This test would appear to be missing an associated RPM during the testing........ Yes/No?

                    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


                    • Nauti_Mike
                      Nauti_Mike commented
                      Editing a comment
                      Yes but Dave cut off the steps before #5 so maybe there are words that indicate the rpm.

                    • builderdude
                      builderdude commented
                      Editing a comment
                      I fix

                    • Nauti_Mike
                      Nauti_Mike commented
                      Editing a comment
                      Good Boy

                    #15
                    Yep, muffed up on the crop job😕 1000 rpm
                    Click image for larger version

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                    Attached Files
                    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

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