Home Forum Ask A Member Mercury KD4

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  • #236233
    green-thumbs
    Participant

      US Member - 2 Years

      Removing and installing crankshaft/reed block is not difficult if you
      have a press or can fabricate a substitute. There are a few things to
      keep in mind to do it right. I will dig up photos that will explain process
      Bear in mind that to get to point where crankshaft can be removed involves a complete disassembly of powerhead. Upper and lower seal
      can be changed without taking powerhed to pieces. Most of the motors
      I have came as rusted, busted, or stuck or all 3 so full rebuild was a given. If you like wrenching that is not a problem,
      Louis
      Pressing crankshaft/reed block in or out of crankcase involves a lot of force applied to crankshaft. To avoid springing the crankshaft install nut and bolt jacks between cheeks of crank throws. I use 1/4×20 bolt
      and nut jacks turned snug ,but, not to tight.

      Sharp eyes will notice crankshaft is from KE4/Mark 7. which has a thinner reed block and 4 reed petals,

      • This reply was modified 3 years, 1 month ago by green-thumbs.
      • This reply was modified 3 years, 1 month ago by green-thumbs.
      #236241
      Boonie
      Participant

        Canada Member

        Thanks Louis. Is this procedure necessary to replace the crank seal?

        #236244
        dave-bernard
        Participant

          US Member

          NO !

          #236246
          opposedtwin
          Participant

            US Member - 2 Years

            NO !

            Dave,
            How do you remove that upper crank seal without removing the shaft?
            Does mercury have a special tool for this procedure? I have a seal remover for OMC upper crank seals and it works very well.

            Scott

            #236249
            Buccaneer
            Participant

              US Member

              It appears to come out the bottom of the crankcase.

              KD4-Powerhead

              Prepare to be boarded!

              #236255
              Boonie
              Participant

                Canada Member

                Yes it does. But I can’t see going thru all of that just to change the upper crank seal!

                #236285
                Boonie
                Participant

                  Canada Member

                  So I can remove the seal with crank still in the engine case? Just try to pry it out?

                  #236299
                  green-thumbs
                  Participant

                    US Member - 2 Years

                    Upper seal can be removed by drilling 2 small holes on opposite sides of the seal, screwing 2 sheet metal screws and prying the seal out, If screws pull out drill 2 more holes and repeat,
                    Mercury part # for seal is 26-21642
                    C/R seal 7415 will work
                    Be sure to lube seal and crankshaft when installing new seal to avoid
                    damage to seal lip.’

                    It isa good practice to have 7/16″x20 fine thread nut on
                    crankshaft when working on powerhead to prevent damaged thread.
                    Before using a nut for this purpose, run a tap thru the nut to be sure
                    the thread us good, As a part of preparing a powerhed for assembly
                    it is an excellent practice to run die over all threads and a tap thru
                    all nuts and threaded holes. Picky Picky, but very often needed,
                    Louis

                    • This reply was modified 3 years, 1 month ago by green-thumbs.
                    #236303
                    Boonie
                    Participant

                      Canada Member

                      Thanks Louis. Ordered new rings from Poole yesterday. When they arrive the assembly will begin.

                      #236323
                      green-thumbs
                      Participant

                        US Member - 2 Years

                        A bit more about removing and installing crankshHaft/reed block assembly
                        1) Nut and bolt jacks are installed thru openings on either side of carburetor opeing. Cover plate has to be removed
                        2) Bolt in side of crankcase screws in to reed block. Remove before pressing and replace after crankshaft is installed.
                        3) When replacing reed block on crankshaft the screw hole and carburetor passage have to line up,,,
                        4) Small hole in reed block is key to aligning reed block so that
                        thread in reed block and bolt hole in crankcase are spot on.

                        • This reply was modified 3 years, 1 month ago by green-thumbs.
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