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Thread: Speedo doesn't work but odometer does

  1. #1
    Starpilot Guest

    Question

    1956 Special: The Speedometer doesn't work but odometer does. Does anyone know what the likely reason is? Is there any chance that is a fuse or something easy to fix like that?

    Also, my wife just pointed out that the brake lights aren't working.... I will have to test the bulb and a fuse for that. The directionals work, but not the bulbs.... I remember a Fiat Spyder that I once had were I was certain there was a major problem, when it turned out that both bulbs had burned our at the same time. I would have bet money on the unlikeness of that, but sure enough. Two new bulbs and good as new.

    Thanks for you help - Louis, NJ

  2. #2
    Join Date
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    Arrow

    Louis, everything inside the speedometer is mechanical. Since the odometer still works, the cable up from the transmission is still rotating properly. What you can see as a speed indicator from the driver's seat is a long painted drum lying on its side. It rotates through part of a revolution in an arc proportional to the RPM of the cable coming up from the transmission. A spiral paint band on the drum makes the pointer look like an arrow through the viewing window.

    This type of speedo was more troublesome even in the old days than the more conventional visible-pointer type (cost about twice as much too). The drum bearings may have worn out and the drum cannot revolve freely any more. Drum might be stuck from dirt or have a broken return spring also.

    The complete head can be removed from the dash for repair. The cause may be something easy once the case is opened up for inspection. Unless you like working on delicate mechanisms like clocks, it would be best to send it off to a specialist dealing in speedometer/instrument repairs.
    What has been, can be again. (Bob Wills, 1942)

  3. #3
    Starpilot Guest

    Post

    Bob, Thank you got your assistance. I was thinking something similiar, but really didn't know.
    Your reply is greatly appreciated.

    Louis

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