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    water in cylinders-gctid811071

    Need help from the pros.Omc 4.3 gas engine in 24ft hard top has run well on 4 trips.Today after an hour running to fishing spot,engine started to act up and died.Would not start but would turn over.Got towed home.Pulled spark plugs and found water on the plugs.Temp gauge has never shown over heating and it does work.Temp goes up but never red lines at 18 knots.Temp drop to half gauge when at 5 knots.No water in oil.Pulled large fuel filter and did a slow pour.Saw no water dropps.Vacuum pulled fuel from fuel line.Pour out on to white metal and saw no water.Engine and all the hard parts are 1988 vintages.So is the exhaust heads bad? Or I am missing something?

    #2
    compression test first all the plugs out, throttle advanced.

    Write down the numbers.

    Do not remvoe manifolds heads anything off the engine yet.

    I already have my suspicions what it is.

    Post back.
    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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      #3
      Try that tomarrow.let you know.thanks for info

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        #4
        Did a compression test.2-6 are steady at 140.psi.Now the down side 1 =150 3=150 5=120.Retested right bank 3 times to comfirm.#3 cylinder was high in water content.Pulled oil cap[its on right cylinder head]Found milky oil on cap.Rechecked oil dip stick.No water or milky stuff.Oil was changed march.No water was found on left bank cylinders.So either the head gasket or head itself is bad or exhaust manifold is bad on right side.FYI compression test rig is top notch.

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          #5
          Elbow, mani or head gasket went that side.

          If it was the intake you would have water both sides.

          Pressure test the block.

          Put air to the green hose, and block the red X hoses ....


          Attached files

          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


            #6
            It could be a head gasket although the #'s aren't horrible. Not good either . I'm going to guess exhaust manifold. After you do you pressure test pull that side manifold off and see what the exhaust port looks like. If there is rust or corrosion of any kind well then there is or has been a leaking exhaust.
            1989 Avanti 3450 Sunbridge
            twin 454's
            MV Mar-Y-Sol
            1979 Bayliner Conquest 3150 hardtop ocean express.
            Twin chevy 350's inboard
            Ben- Jamin
            spokane Washington

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              #7
              Thanks for help.Going at it again monday on this thing.

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                #8
                After the pressure test take off the manifold on that side (original OMC one piece V6 units?) and set it on a level surface. Carefully fill it with acetone and watch the exhaust ports for any signs of leaks. If so you know that's your source. Take a look inside the exhaust ports in the cyl head on that side and look for rusted ports and exhaust valves.
                88 Four Winns 200 Horizon 4.3 OMC
                98 Jeep Grand Cherokee 4.0/Selectrac
                07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

                Long Island Sound Region

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                  #9
                  Just want to get it out the 4.3l will crack right in the valley between the heads if not winterized correctly.
                  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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