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Thread: the intriging case of the variable rate speedo

  1. 21st September 2009, 12:25 PM #1
    incisor's Avatar
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    the intriging case of the variable rate speedo

    just to keep me interested, my 110 has decided to play tricks on me..

    when cold and for the first couple kilometers my speedo runs pretty much smack on what the gps tells me i am really doing..

    after about 3 or so kilometers this accuracy drifts off with the fairies...

    after about 5 klms it settles out and shows 85 kph when i am really doing about 100 kph

    anyone have a clue what would be causing this?
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  2. 21st September 2009, 12:50 PM #2
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    There has been a warp in the space-time continuum. Dur to a technical error at the speedo manufacturers, a top-secret device that measures this and was disguised as a defender speedo got switched with your speedo intead of sent to the MOD.

    Or perhaps there is some water or condensation in a plug/the instrument? Is it an electronic speedo or mechanical?
    If mecanical, maybe a slipping drive gear or busted cable that still has some connection through friction?

    Have fun!

    Dave
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  3. 21st September 2009, 12:51 PM #3
    mike 90 RR Guest
    Which setup do you have?? ....

    A All cable connection from gearbox to speedo ...
    B Short cable from gearbox to transducer ... then spark wires to speedo??

    Mike
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  4. 21st September 2009, 01:40 PM #4
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    A. all cable i believe.
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius
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  5. 21st September 2009, 01:41 PM #5
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    Quote Originally Posted by davros View Post
    There has been a warp in the space-time continuum. Dur to a technical error at the speedo manufacturers, a top-secret device that measures this and was disguised as a defender speedo got switched with your speedo intead of sent to the MOD.
    i'll have some of what your having :P
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius
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  6. 21st September 2009, 01:48 PM #6
    mike 90 RR Guest
    Quote Originally Posted by incisor View Post
    this accuracy drifts off with the fairies...

    anyone have a clue what would be causing this?
    British standard's ... I believe

    Quote Originally Posted by incisor View Post
    A. all cable i believe.
    Well ... If you chose "B" ... I could have made it easy for you

    But you HAD to choose "A" .....

    Borrow someones speedo cable
    Try another speedo
    Check the gear cog at the end of the cable (gearbox end)

    Mike
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  7. 21st September 2009, 01:53 PM #7
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    Or possibly the worm drive on the output shaft slipping. This is held by a collar and then the rear output drive flange. Check that the nut is tight on the output flange - that could explain the difference between cold and hot................Brian
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  8. 21st September 2009, 06:39 PM #8
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    Is it there any oil in the speedo head?
    Seen it twice on Jap. cars were the oil had worked it's way up the inner speedo cable.

    Cheers, Kyle.
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  9. 21st September 2009, 06:59 PM #9
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    a, the cable slipping tho this usually shows up as jumping.

    b, the magnets in the speedo are giving up with heat, if youve got the time heat the speedo up with the wifes hair drier for about 20 minutes/ half an hour before driving and if it does the fault straight up its the head unit.

    No I dont have a spare one.
    Dave

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  10. 21st September 2009, 07:40 PM #10
    Bush65
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    I had this happen for a while in my rangie and on a trip back from QLD I was booked twice in the same day for speeding.

    In my rangie's speedo, the spindle with the needle on it is coupled to a spindle with the driven disc by an aluminium sleeve. Both spindles are pressed into opposite ends of the sleeve.

    As the temperature increased, differential expansion rates allowed one, or both spindles to slip inside the sleeve. The fix was simply to squeeze the aluminium sleeve to increase the grip on the spindles.
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