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Speedo Cable

Discussion in 'Intermediate CJ-5/6/7/8' started by XXIIILIV, May 15, 2022.

  1. May 15, 2022
    FlatlanderCJ5

    FlatlanderCJ5 New Member

    Wichita, KS
    Joined:
    Jan 2, 2022
    Messages:
    49
    Just a thought, can these cables be chucked in to a drill and then run at various speeds? That would indicate whether it's the speedo itself or the drive gear on the transmission.
     
  2. May 15, 2022
    XXIIILIV

    XXIIILIV New Member

    Las Vegas, nv
    Joined:
    Apr 16, 2022
    Messages:
    33
    Thought about that as well, but, with the odometer working, it seems all from the speedo back, is good
     
  3. May 15, 2022
    XXIIILIV

    XXIIILIV New Member

    Las Vegas, nv
    Joined:
    Apr 16, 2022
    Messages:
    33
    FSM isn’t much help other than to say it’s magnetic. I have it apart, see the magnetic part, and as a bonus, see how to zero the needle. It was way off, almost touching the “T” on the temp gauge. Maybe that’s problematic?
     
  4. May 15, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,502
    There is an aluminum cup that connects to the needle via the coil spring. The cable rotates magnets inside the cup. This makes eddy currents in the cup that couple to the spinning magnets and rotate the cup.

    There are shops that repair speedometers. I don't see much online about DIY speedometer head repair.
     
  5. May 15, 2022
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    8,494
    Part of the specialist know-how is de-gaussing or "burning" the aluminum cup disc and magnet arangement. Don't try this at home, IMHO.
     
  6. May 15, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,502
    XXIIILIV likes this.
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