70 Eldorado speedometer sticks
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  • 1 Post By BRUCE ROE
The Classic Cadillac Forum Discussion, 70 Eldorado speedometer sticks in Past Cadillac Vehicle Discussion; Hi, I recently replaced the speedometer and transmission cable as the one I had between the cruise control and the ...
  1. #1
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
    Automobile(s): 1970 Eldorado.
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    70 Eldorado speedometer sticks

    Hi, I recently replaced the speedometer and transmission cable as the one I had between the cruise control and the speedometer was too long. I had to route an extra loop in the cable to fit it somewhere. Because of the tight loop the twist wire inside the cable would then catch the insulation and the speedometer needle would wobble up and down because of it.

    Initially the needle was stable again after I replaced the cables. Which was to be expected. But Last weekend I made a short trip and the needle would stick at some speed and release when the speed would be significantly (+20mph) higher. The needle would also stick at 20mph at a stop.

    Is this something mechanical I need to clean? Or is this something electrical? And how do I fix that?

    Thanks!

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  3. #2
    77CDV's Avatar
    77CDV is offline Cadillac Owners Master
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    Re: 70 Eldorado speedometer sticks

    Sounds like lubrication is in order.

  4. #3
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
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    Re: 70 Eldorado speedometer sticks

    Of course I completely lubricated the twist cable before I installed it.

    As far as I understood the rotation of the cable will translate in a magnetic flux in the speedometer to make the speedometer needle (spring loaded) move. I can only think of dust or dirt (or lube?) that could make the needle stick at a speed indication when the car is not moving, but I am not sure. Can I open the speedometer assembly at all? Someone has experience in that?
    I can only recall a sealed clear plastic box the speedometer assembly consists of when I was working behind the dash for the radio and the speakers...

  5. #4
    BRUCE ROE is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado
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    Re: 70 Eldorado speedometer sticks

    There are 3 bearings in the needle setup. The cable plugs into the back input shaft, to
    spin the magnet on the other side of the bearing. The back of the needle rests in a
    bearing in the center of the magnet. Likely neither of these are your problem today.
    The front of the needle is clipped loosely in place; sticking while motionless implies
    dirt, etc in this area. Bruce Roe
    70eldo likes this.

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