1916 48B 7 pass, touring, FR Wood body- new owner, where do I begin?

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  • December 19, 2017 at 11:56 pm #405719
    Author nameAuthor names are only available to PAS members.

    Regarding the needle for your fuel gauge: The gauge needle is not attached to the pin that rises from the center of the fuel gauge face or dial.. Note i did not say shaft, I said pin.. The pin is fixed it does not turn..

    The indiction needle dose not fit on the pin, it rests on the tip of the pin, and pivots. it is much like the needle on a compass you sure in Boy Scouts or the Service. The needle swings freely and pivots on the fixed pin.

    Underneath the face or dial of the gauge is the pressurized side of the gauge. The gauge does not leak, letting air pressure out of the tank..

    So, what makes the gauge indication needle point to a correct number or fraction on the face of the gauge.? Under the face, on the pressurized side of the gauge, there is a shaft that is aligned with the pin that the needle rests on and spins on. One end of the shaft is a gear, that meshes with another pivoting gear, and at the opposite end of the pivot is a float. The float rides the top of the fuel level, The gear on the float arm turns the gear on the vertical shaft that rises up to just below the underside of the gauge’s dial or face..

    At the end of the shaft, there is a small bar magnet, it is about the same length as the indication needle above the face of the gauge..

    The needle is captured in the magnetic flux coming through the brass or aluminum face of the gauge. The magnet keeps the needle pointing to the correct fraction of fuel in the tank..

    Characteristics of a fuel gauge needle:

    It has a pivot in it’s center, usually brass with a small hole or bore into the pivot, it is a blind hole, it does not go through the pivot.

    The needle has to be balanced. since it is not forced onto a shaft to keep it level with the gauge’s face or dial. The needle must balance on the fixed pin.. so it usually is nearly symmetrical or equal on each side of the pivot.

    I’ll post a photo of a fuel gauge needle tomorrow if I find time..

    Greg Long

    December 20, 2017 at 12:33 pm #405713
    Author nameAuthor names are only available to PAS members.

    Greg’s explanation is technically interesting, but it doesn’t solve the problem.

    Perhaps a small bead of JB Weld on the center hole of a watch hand would close the hole and a touch with a Dremel on the underside would make a indentation sufficient to make the hand / needle sit on the pin.

    Then, the magnetic field described above would hold it in place, but I don’t know.

    Perhaps Greg know how to fix or replace the gauge, as I do not beyond my previously offered suggestions.

    Maybe a Compass Needle is the solution.

    BTW, per the description above, that is how Wayne Hancock’s reproduction Gas Gauges operate, and perhaps Wayne has a spare needle to sell, albeit smaller than.

    If not, he may have information that will lead to a solution.

    Finally Bill, if all else fails, your watchmaker should be able to fabricate what you need from a pocket watch hand.

    Peter

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