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Perfect Seal / Permatex Aviation #3 or Ultra RTV

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  • Perfect Seal / Permatex Aviation #3 or Ultra RTV

    In the process of changing my Alpha 1 Gen 2 impeller for the 1st time. I noticed
    the pump housing has a raised lip and the previous owner has a nice gray bead of RTV between the housing and the gasket.

    This makes more sense to me than Perfect or Perm AV #3 which deploys a brush for application.

    Can I use RTV Ultra Blue, Gray or even Black in place of Perfect Seal or Permatex Aviation #3???

    Just seams the "brush on" would be a lot more messier.

    Thanks,
    Sam
    2003 Ford F150 Super Crew 5.4
    1985 Jeep CJ7 258
    1995 Searay 180 Signature Series Merc 5.0 Alpha 1 Gen 2

  • #2
    Re: Perfect Seal / Permatex Aviation #3 or Ultra RTV

    Brush the aviation #3 on to the gasket, not the outdrive. No mess. I would stay away from silicone down there. Your boat looks very familiar.
    Mike
    1995 Searay 180BR
    4.3LX 4bbl, Alpha Gen II

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    • #3
      Re: Perfect Seal / Permatex Aviation #3 or Ultra RTV

      The impeller housing has a "raised lip" to gasket seating....so I was thinking it's better to have a nice sealing bead along the flat surfaces. At least there was a perfectly nice bead of gray RTV when I removed mine.

      2003 Ford F150 Super Crew 5.4
      1985 Jeep CJ7 258
      1995 Searay 180 Signature Series Merc 5.0 Alpha 1 Gen 2

      Comment


      • #4
        Sign up today
        Re: Perfect Seal / Permatex Aviation #3 or Ultra RTV

        I threw some rtv in there as well. I gots the same thing but i just did this 2 weeks ago and it was logic for me.
        1996 Bayliner Capri 1950 CL
        3.0 LX Alpha One Gen. II
        14.25x21P

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