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Thread: Speedometer Question

Forum to discuss Austin Healey Sports Cars

  1. #1
    Jedi Hopeful
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    Speedometer Question

    I have read that you can check if your speedometer is working by attaching a drill to the speedometer cable. Someone told me you have to run the drill in reverse?
    Before I do this I wanted to check if anybody has done this and is there any harm that can be done to the speedometer or cable.
    Is there anything else I need to know before I trash a perfectly good speedo.

    Thank you in advance.

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    Jedi Hopeful
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    Re: Speedometer Question

    Yes you can... I suggest that you give it a good covering of WD40 and turn it by hand before attaching the drill. I assume that you want to test for accuracy ? If so, there are far more qualified members on this forum that can give you guidance on calibration..

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    Jedi Knight bighealeysource's Avatar
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    Re: Speedometer Question

    Hey TodE,
    If you're just wanting to check the accuracy of it, download one the free "speedometer" apps to your smart phone that have the built in GPS. Thought mine was off but after comparing it to the app speeds via GPS, found it was almost spot on.
    Regards
    Mike
    Mike Lewis, 1956 Austin Healey 100M - Registry Confirmed

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    Yoda
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    Re: Speedometer Question

    If you have an old speedometer cable cut it off at about 12", chuck the cut end in your drill and use it to drive the speedo. Twirl the cable with your fingers first to make sure the speedo isn't frozen. It should spin in either direction--CC or CCW--but the needle will only respond in one (think it's reverse, but not sure).

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    Obi Wan Johnny's Avatar
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    Re: Speedometer Question

    You haven't said if yours is working or not? What's the problem?
    By just observing the speedo you can learn a lot.

  6. #6
    Obi Wan Patrick67BJ8's Avatar
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    Re: Speedometer Question

    The drill speed will normally run faster then the speedo cable does from the trans so be careful.
    Patrick
    '67 Metallic Golden Beige/Red
    Owned since '72

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    Re: Speedometer Question

    Johnny, Yes I just want to see if it is working. I had the speedo in the car, with the car on jack stands, I started the car put it in gear and slowly depressed the pedal. The cable in the angle drive broke. (I later found out you need the copper washer on the angle drive on the transmission side.) I thought the speedo was froze, but now I am not sure. This speedo did not come out of this car, it was a used one I bought.
    Does anybody know if Nisonger rebuilds angle drives? If so does anybody know the cost?

  8. #8
    Yoda
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    Re: Speedometer Question

    At $43.50 from Moss, it's not worth rebuilding. We rebuilt a BN2 drive from a couple donors, but those are a couple hundred bucks.

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