Hi Simon,
I would add to Alan's recommendations the following:
After removing the speedo and before taking the car for a drive try driving
the speedo using a battery operated drill. You have to run the drill in
reverse and find a suitable bit of something to fit into the chuck which
will engage the square drive recess in the back of the speedo.
It has been my experience that very often cable failures are caused by
problems in the speedo itself, most commonly a seized odometer.
If the speedo starts to "tighten up" as you are spinning it in this way do
not try to force it to turn or you will strip the small fiber gear that
drives either the trip or odometer counter. (don't aske me how I know or how
hard it is to find a replacement gear of the correct type :-))
Michael Salter
On Sun, Nov 21, 2010 at 8:46 PM, Alan Seigrist <healey.nut@gmail.com> wrote:
> Simon -
>
> First remove the speedometer and set it up where you can see the speedo
> cable through the speedo mounting hole.
>
> Be sure the cable is pushed all the way in the sleeve and then take the car
> for a drive. If the cable spins, likely something is wrong with the speedo
> and it needs rebuilding.
>
> If the cable doesn't spin, I suspect the little 1" to 2" cable that is
> in-between the cable drive and the gearbox will have snapped. These
> little cables snap all the time, usually due to a missing sealing washer
> under the cup.
>
> Even if the cable does spin while driving, it's good to pinch your fingers
> on the spinning cable to see if it stops spinning. If it keeps spinning,
> then the problem is your speedo.
>
> My guess it's the little cable between the angle drive and gearbox.
>
> :(
>
> Good Luck,
>
> Alan
>
> On Mon, Nov 22, 2010 at 7:18 AM, Simon Lachlan <
> simon.lachlan@homecall.co.uk
> > wrote:
>
> > My speedometer has stopped working.
> >
> > Now, I have done nothing by way of diagnosis except make sure the cable
> is
> > attached to the speedo at the back. My question is this....is there any
> one
> > thing that one might call the "usual " fault with these things, a "first
> > place to look"?
> >
> > It used to work fine, by which I mean that there has not been a period of
> > on/off or wobbly needle or whatever.....one day fine, next day nothing.
> If
> > it was electric you'd check the fuse!!
> >
> > Thanks,
> >
> > Simon
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