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Trim Pump Vent Screw

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  • Trim Pump Vent Screw

    Hi There. Just removed the Vent Screw on "my new to me" used trim pump and noticed that it looks like a #10 Sheet Metal Screw with a Blunt Nose.

    Just wondering if that's the correct screw for the vent?
    The fill screw is a machine thread.

    Also, I need to replace the plastic down hose (lower circled fitting) that goes from the pump to the trim indicator piston. What kind of pressure is on this hose?

    Thanks

    1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
    1974 Glastron V-179, Mercruiser 140
    1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
    Manitoba, Canada

  • #2
    Re: Trim Pump Vent Screw

    everyone knows sheet metal screws aren't meant for engines bit some idiot zipped it in there. personally, i would use a tri-tap and rethread the hole to, maybe the next size larger, but one that fit correctly. some may differ and say, if it doesn't leak, it's ok. you're call. about the trim hose, i can't help you there, but i'm sure someone here will, sooner or later. good luck!

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    • #3
      Re: Trim Pump Vent Screw

      Pump pressure is 400 to 600 psi on down side, and 2200 to 2600 psi on the up side.
      Of those who receive good advice, only the wise will profit from it.

      If you need it....Get it
      If you want it....Wait
      If you have it....Flaunt it

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      • #4
        Re: Trim Pump Vent Screw

        Thanks for the prompt replies.

        Anyone know what size fastener should be in the vent hole?

        Also, if it's a machine screw - how does it vent?
        1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
        1974 Glastron V-179, Mercruiser 140
        1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
        Manitoba, Canada

        Comment


        • #5
          Re: Trim Pump Vent Screw

          if yer gonna tap that hole. i'd be concered about where the metal shaveings from the tapping process go. like into the trim pump maybe. that might not be to good for it.....i think if it were mine, i'd just leave the sheet metal screw in it and leave well enough alone...it's just a vent......
          'Lime Time'
          1975 AristoCraft Nineteen
          Mercruiser 165hp (chevy 250 L6), MC-1 drive

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          • #6
            Re: Trim Pump Vent Screw

            Marc C,
            On http://dougrussell.com web site, I found the reservoir fill plug part number 392-7728 for $4.39 each. I looked under Mercruiser Alpha 1 "Hydraulic Pump Prestolite" parts listing.
            Crawdadric

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            • #7
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              Re: Trim Pump Vent Screw

              Originally posted by crawdadric View Post
              Marc C,
              On http://dougrussell.com web site, I found the reservoir fill plug part number 392-7728 for $4.39 each. I looked under Mercruiser Alpha 1 "Hydraulic Pump Prestolite" parts listing.
              Crawdadric
              Thanks for the link. I found some part numbers for an older model that might help me out.
              1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
              1974 Glastron V-179, Mercruiser 140
              1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
              Manitoba, Canada

              Comment

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