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    Block Test-gctid804681

    Learned Scholars, I have a 1991 Bayliner Capri 1850 with the Mercruiser 3.0 I/O.

    I have the classic "Cappuccino" oil , and am suspicious of an internal leak.

    My question is this, I am removing the head and manifold to check for cracks, is there any advantage to making a 6" x 19" 1/4" plate with a rubber gasket that I can bolt on the block to seal it.

    This would replace the cylinder head and completely seal of the block.I can then pressure test the block I believe, if this is feasible, where should I introduce air and to what pressure ?

    Thanks in advance,

    Andy

    #2
    "Moss" post=804681 wrote:
    Learned Scholars, I have a 1991 Bayliner Capri 1850 with the Mercruiser 3.0 I/O.

    I have the classic "Cappuccino" oil , and am suspicious of an internal leak.

    My question is this, I am removing the head and manifold to check for cracks, is there any advantage to making a 6" x 19" 1/4" plate with a rubber gasket that I can bolt on the block to seal it.

    This would replace the cylinder head and completely seal of the block.I can then pressure test the block I believe, if this is feasible, where should I introduce air and to what pressure ?
    [color]#000088 wrote:
    Andy, before you remove the cylinder head:

    1...... check the exhaust manifold for cracks within the cooling passages.

    You may find that the water in the oil is due to a crack. If so, water could be entering a cylinder at low rpm, and could be getting past the piston rings.

    2.... perform a cylinder leak-down test.

    [/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


      #3
      Thanks Bounty, I will do that this weekend, I wanted the head off because I did a pressure test and got 130 psi, 130, psi,130 psi, and then 107 psi on first cyl (nearest Thermostat end).

      My initial thought was that on the plate I make I could also machine four tapped ports to put four gauges (one above each cylinder and pressurize the block to see if one was leaking by the rings worse than the others).

      I've never really had much luck doing leak-down tests, I think my hearing may be on the way out ! LOL

      Andy

      Comment


        #4
        A cylinder pressure test (aka compression check) and a cylinder leak-down are not the same. The leak-down test involves a special tester and a compressed air supply

        Once the cylinder head is removed, the oportunity for a leak-down test is gone.
        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
          Was there any water in the cylinders when you preformed the compression test ?

          We can rule out exhaust manifold if there is no water in the cylinders, leaving blown head gasket or cracked block. Since the compression is present, this would indicate a cracked block.

          We can pressure test the engine block by removing the water supply hose from the drive connecting to the thermostat housing.

          Disconnect the hose going to the exhaust manifold and plugging on the engine side. Where you disconnected the hose from the drive use a short piece of hose and connect to the thermostat housing and using regulated compressed air after removing the plugs , and dip stick apply the air.. If air flows out spark plugs you have a cracked head or block, if water comes out the dip stick you have a cracked block.

          Post back AFTER you preform the test, we will go from there.

          DO NOT DISASSEMBLE ANYTHING YET !

          I can explain that low number on #1 cylinder, but first the test !

          I have had this exact same problem .
          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
            Thanks Chief, I will do the tests this weekend.

            Bounty, I have a leak-down test kit, but part of the tests require a keen ear.... sadly I don't have that.

            Chief, if my issue turns out to be the same as yours ....,.... was it an easy fix or new block ?

            Thanks,

            Andy

            Comment


              #7
              First time it happened to me it was the head.

              I took off the t- stat housing off and shined a light into the hole, probed the wall opposit with a screw driver low and behold there was a hole into the pushrod hole.

              Second time the mani went.

              Where generally are you located in the real world ?
              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


                #8
                Test Results !

                Pressurized the block through an adaptor I made through the thermostat hose, using the plate I made to 20 PSI, and smeared soapy water over the dip-stick tube and watched tiny bubbles appear and then burst.

                This means the block is leaking, correct ?

                That being the case , is there an automotive block I can use instead ? I realize I have to swap out parts, but am fine with that.

                The used Mercruisers I have found are around $1500 here (Ontario Canada).

                The Engine is a 1991 Mercruiser 3.0 L and is a Bayliner Capri 1850

                Thanks again Folks,

                Andy

                Comment


                  #9
                  "Moss" post=805161 wrote:


                  That being the case , is there an automotive block I can use instead ? I realize I have to swap out parts, but am fine with that.

                  The used Mercruisers I have found are around $1500 here (Ontario Canada).

                  The Engine is a 1991 Mercruiser 3.0 L and is a Bayliner Capri 1850

                  Thanks again Folks,

                  Andy
                  [color]#000088 wrote:
                  Andy, I am not certain but I'm thinking that the 3.0L may have been used in the Chevy II cars, and for only a few years.

                  However, since it also worked well in the Marine environment, GM continued producing the 3.0L for Marine use, and it is still being used today.

                  So in short........ I doubt that you can find one from an automotive application.

                  Take a look here.

                  [/color]https://www.google.com/search?hl=en&source=hp&biw=&bih=&q=GM+3.0L+cylinde r+block+&gbv=2&oq=GM+3.0L+cylinder+block+&gs_l=hei rloom-hp.12...1963.8522.0.10104.23.18.0.5.0.0.105.1466.1 5j3.18.0....0...1ac.1.34.heirloom-hp..6.17.1407.cR4JayKgXNw#spf=1
                  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


                    #10
                    The 3.0 l GM engine used in boats has never ever been used in automotive application.
                    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


                      #11
                      Thanks guys, it looks like I may be in trouble then !

                      Anyone got any info on the "Iron Duke" I keep hearing about, is that a replacement for this engine ?

                      Andy

                      Comment


                        #12
                        The 3.0 l GM engine used in boats has never ever been used in automotive application.
                        I was thinking Chevy II, but was not quite sure.

                        However, the inception of the 3.0L 4 banger was used in the Chevy Chevette beginning as a either a 1.5L or 1.6L (coined the "iron duke").

                        It later underwent a cylinder diameter change to 4.000".

                        The 4.000" bore gave it a 3.0L displacement.

                        From there it was primarily used in industrial applications, and simultaneously it found it's way into the Marine environment.

                        So...... the answer to finding an actual automotive 3.0L cylinder block is NO!

                        Industrial or Marine..... yes!

                        .
                        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


                          #13
                          Nope GM 3.0 181 CID never been used in auto application!

                          http://m.ebay.com/itm/Mercruiser-GM-...%257Ciid%253A1
                          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


                            #14
                            Well Gents, I appreciate all suggestions and help.

                            I'll have to explore some other options ....(if there are any) .

                            Andy

                            Comment


                              #15
                              Find a good 3.0 donor boat,

                              Michigan motorz long block for $1800,
                              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

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