45 Crankcase Sealant

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  • Rex
    Senior Member
    • Jan 2006
    • 152

    #1

    45 Crankcase Sealant

    Manuals specify shellac, found mine to be sealed with black RTV. What is the best sealant for the crankcase halves today?
  • Rubone
    Senior Member
    • Aug 2004
    • 4769

    #2
    Yamabond, Hondabond, basically any good hylomar non-hardening sealant. And NOT RTV.
    Last edited by Rubone; 05-01-2022, 03:14 PM.
    Robbie Knight Amca #2736

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    • T. Cotten
      Gadfly from the Dumpster
      • Jun 2001
      • 8223

      #3
      3M 'Scotch-Seal' 800 Industrial Sealant, Rex!

      I believe it has an -80 OEM number.

      (But I 'spose I should have searched it to see if it is still produced; I'm down to two tubes.)

      ....Cotten
      PS: I had Yamabond4 fail for me. But it was an OHV with a leaky petcock.
      Last edited by T. Cotten; 05-01-2022, 03:07 PM.
      AMCA #776
      Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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      • Rex
        Senior Member
        • Jan 2006
        • 152

        #4
        Originally posted by Rubone View Post
        Yamabond, Hondabond, basically any good hylomar non-hardening sealant. And NOT RTV.
        hylomar.jpeg

        Seems like I bought a tube of hylomar at NAPA for the Buell several years ago, but it isn't listed now.
        Last edited by Rex; 05-01-2022, 05:57 PM.

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        • Rex
          Senior Member
          • Jan 2006
          • 152

          #5
          Originally posted by T. Cotten View Post
          3M 'Scotch-Seal' 800 Industrial Sealant, Rex!

          I believe it has an -80 OEM number.

          (But I 'spose I should have searched it to see if it is still produced; I'm down to two tubes.)

          ....Cotten
          PS: I had Yamabond4 fail for me. But it was an OHV with a leaky petcock.

          Looks like it's still around.


          800.jpg

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          • Carl Olsen
            Senior Member
            • Jan 2002
            • 261

            #6
            If you do not want to go in a Honda or Yamaha shop, you can get the same thing at an auto supply, Permatex Moto Seal.
            Carl
            http://www.carlscyclesupply.com

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