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Thread: Flush-mount gas cap stuck

  1. #1

    Flush-mount gas cap stuck

    >>I am in a bit of a pickle. My gas cap will not come off and I don't see any way of removing it. There are several (10 +) Phillips head screws that attach the gas cap "opening" to the wing, but I'm guessing that the nuts on the other side of these screws are not captive hardware, and will just spin if loosened. Has anyone here ran across this problem, and if so what did you do to resolve it? Thanks! JM A23-24<<

    The screws hold the mounting ring in place, and its tricky to get it off even when the cap is already off! Although it woudl be theoretically possible to drill the heads off the screws, this wuld be an absolute LAST DITCH effort, and only after considering the possibilities of a spark from the steel screw and the steel drill bit igniting the fuel vapors in the tank!

    If your cap's tab will lift and rotate, so that the cap is unlatched, and you can not get the cap up out of the hole, it may be that the o-ring is stuck to the mounting ring. A little careful prying between the aluminum/magnesium cast cap and the stamped steel mounting ring might pop it loose. A new outside O-ring and some Parker Fuel Lube periodically will prevent the o-ring from sticking again.

    If you mean that the cap flip up tab won't budge, you have little choice but to pry it up. If its up and you can't turn it to unlock the cap, then some penetrant (I like Mouse Milk) down the center of the cap may help loosen the corrosion that is binding the shaft in the cap. A pair of pliers to rotate the tab may be your next step.

    Off hand I can't think of a cap malfunction that would cause the cap to remain latched when the tab was lifted and turned, so I think this covers the possibilities.

    There are parts available for the Shaw Aero Devices caps. These are an area where little or no maintenance seems to be performed. The caps ought to be disassembled and lubed periodically. There is a small O-ring inside the cap to seal the shaft to the cap body, and these are frequently found to be badly deteriorated from 30 years of neglect. This allows rain/wash water in the fuel tanks and also allows corrosion to form inside the cap.

    --Bob Steward A&P IA
    Birmingham, AL


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  2. #2

    Flush-mount gas cap stuck

    IN ADDITION to doing what Bob suggested, add the following:
    Put an 'ice pack' on top of the cap, and put a very hot towel around the
    cap and let sit for a few minutes. I think you see where I'm going
    with this. GOOD LUCK.
    Bill Passinos
    Still Without Wings

    On Fri, 10 Feb 2006 11:53:29 -0600 (GMT-06:00) n76lima@mindspring.com
    writes:
    >>I am in a bit of a pickle. My gas cap will not come off and I don't see
    any way of removing it. There are several (10 +) Phillips head screws
    that attach the gas cap "opening" to the wing, but I'm guessing that the
    nuts on the other side of these screws are not captive hardware, and will
    just spin if loosened. Has anyone here ran across this problem, and if so
    what did you do to resolve it? Thanks! JM A23-24<<

    The screws hold the mounting ring in place, and its tricky to get it off
    even when the cap is already off! Although it woudl be theoretically
    possible to drill the heads off the screws, this wuld be an absolute LAST
    DITCH effort, and only after considering the possibilities of a spark
    from the steel screw and the steel drill bit igniting the fuel vapors in
    the tank!

    If your cap's tab will lift and rotate, so that the cap is unlatched, and
    you can not get the cap up out of the hole, it may be that the o-ring is
    stuck to the mounting ring. A little careful prying between the
    aluminum/magnesium cast cap and the stamped steel mounting ring might pop
    it loose. A new outside O-ring and some Parker Fuel Lube periodically
    will prevent the o-ring from sticking again.

    If you mean that the cap flip up tab won't budge, you have little choice
    but to pry it up. If its up and you can't turn it to unlock the cap,
    then some penetrant (I like Mouse Milk) down the center of the cap may
    help loosen the corrosion that is binding the shaft in the cap. A pair
    of pliers to rotate the tab may be your next step.

    Off hand I can't think of a cap malfunction that would cause the cap to
    remain latched when the tab was lifted and turned, so I think this covers
    the possibilities.

    There are parts available for the Shaw Aero Devices caps. These are an
    area where little or no maintenance seems to be performed. The caps
    ought to be disassembled and lubed periodically. There is a small O-ring
    inside the cap to seal the shaft to the cap body, and these are
    frequently found to be badly deteriorated from 30 years of neglect. This
    allows rain/wash water in the fuel tanks and also allows corrosion to
    form inside the cap.

    --Bob Steward A&P IA
    Birmingham, AL


    Join BAC today and be a part of the ONLY Type Club for the Musketeer
    series!

    www.beechaeroclub.org






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  3. #3

    Flush-mount gas cap stuck

    As usual Bob provides sage words and you might possibly try some
    silicone spray around the edge, to wick down to the rubber seal.
    What I'd like to add is a rust-breaking trick if it's the tab. Tap
    around the edges with a wood hammer or put a piece of thin rubber on
    the cap to protect the paint and run a vibrating sander on that
    while pressing down hard.
    Bob
    --- In musketeermail@yahoogroups.com, n76lima@... wrote:
    >
    > >>I am in a bit of a pickle. My gas cap will not come off and I
    don't see any way of removing it. There are several (10 +) Phillips
    head screws that attach the gas cap "opening" to the wing, but I'm
    guessing that the nuts on the other side of these screws are not
    captive hardware, and will just spin if loosened. Has anyone here
    ran across this problem, and if so what did you do to resolve it?
    Thanks! JM A23-24<<
    >
    > The screws hold the mounting ring in place, and its tricky to get
    it off even when the cap is already off! Although it woudl be
    theoretically possible to drill the heads off the screws, this wuld
    be an absolute LAST DITCH effort, and only after considering the
    possibilities of a spark from the steel screw and the steel drill
    bit igniting the fuel vapors in the tank!
    >
    > If your cap's tab will lift and rotate, so that the cap is
    unlatched, and you can not get the cap up out of the hole, it may be
    that the o-ring is stuck to the mounting ring. A little careful
    prying between the aluminum/magnesium cast cap and the stamped steel
    mounting ring might pop it loose. A new outside O-ring and some
    Parker Fuel Lube periodically will prevent the o-ring from sticking
    again.
    >
    > If you mean that the cap flip up tab won't budge, you have little
    choice but to pry it up. If its up and you can't turn it to unlock
    the cap, then some penetrant (I like Mouse Milk) down the center of
    the cap may help loosen the corrosion that is binding the shaft in
    the cap. A pair of pliers to rotate the tab may be your next step.
    >
    > Off hand I can't think of a cap malfunction that would cause the
    cap to remain latched when the tab was lifted and turned, so I think
    this covers the possibilities.
    >
    > There are parts available for the Shaw Aero Devices caps. These
    are an area where little or no maintenance seems to be performed.
    The caps ought to be disassembled and lubed periodically. There is
    a small O-ring inside the cap to seal the shaft to the cap body, and
    these are frequently found to be badly deteriorated from 30 years of
    neglect. This allows rain/wash water in the fuel tanks and also
    allows corrosion to form inside the cap.
    >
    > --Bob Steward A&P IA
    > Birmingham, AL
    >







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