Shaft Coupling Inner Coupling will not come apart of outer coupling

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  • ColeHarmening
    Senior Member
    • Apr 2020
    • 24

    Shaft Coupling Inner Coupling will not come apart of outer coupling

    Hello,

    I am removing my prop shaft and I can not for the life of me get the inner and outer part of the coupling to come apart. All 4 bolts are removed and the shaft keys are removed. I can see the hairline seem that connects the two halfs of the coupling but they will not come apart. Any tips on getting these two apart?

    I have tried going around the edge with a chisel and have tried knocking the shaft aft by lightly hammering the prop. Last thing I can think of is heat but I do not like torching things inside a gas engine bilge.
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  • ndutton
    Afourian MVP
    • May 2009
    • 9780

    #2
    Have a look at this thread from 7 years ago:
    Neil
    1977 Catalina 30
    San Pedro, California
    prior boats 1987 Westsail 32, 1970 Catalina 22
    Had my hands in a few others

    Comment

    • Dave Neptune
      Afourian MVP, Professor Emeritus
      • Jan 2007
      • 5115

      #3
      For the most part a chisel is not a sharp enough edge. I have had pretty good luck using a "thin blade" stainless steel kitchen knife, usually a small one like for paring. Be sure the knife is parallel to the halves and strike lightly. The sharper edge will have much more wedge power for separating the halves. Rotate around the outside and tap lightly and slowly increase the tapping pressure as you work around the coupling.

      Clean off the rust with a wire brush so you can see the halves better and start the smacking when you can see a good spot to start.

      I have also used a Hyde brand thick blade putty knife as the blade is one piece all the way through the handle for hammering lightly.

      Don't use heat unless you are also replacing the seals which will be ruined by the heat of a torch.

      Dave Neptune

      Comment

      • ColeHarmening
        Senior Member
        • Apr 2020
        • 24

        #4
        Originally posted by ndutton View Post
        Have a look at this thread from 7 years ago:
        https://www.moyermarineforum.com/for...ad.php?t=10142
        Wow you smart! How Can I get in touch with you to get that tool shipped to me?

        Comment

        • ndutton
          Afourian MVP
          • May 2009
          • 9780

          #5
          I haven't seen it in a while, let me see if I can find it. I'll contact you through the forum software. Ooh, Oceanside. We're somewhat local.
          Neil
          1977 Catalina 30
          San Pedro, California
          prior boats 1987 Westsail 32, 1970 Catalina 22
          Had my hands in a few others

          Comment

          • ColeHarmening
            Senior Member
            • Apr 2020
            • 24

            #6
            Well Oceanside is where I started from. Been cruising Mexico 2 years and now at the top of the Sea of cortez at Cabrales boat yard.

            Comment

            • ndutton
              Afourian MVP
              • May 2009
              • 9780

              #7
              Okay, found it. PM coming your way.
              Neil
              1977 Catalina 30
              San Pedro, California
              prior boats 1987 Westsail 32, 1970 Catalina 22
              Had my hands in a few others

              Comment

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