Buggered speedo?
Discussion
Okay I admit it, I think I've buggered my speedo. The speedo cable threaded connection for the back of the speedo had parted company with the main cable. I carefully got it back together, re-crimped it, araldited it and also added some heat shrink for good measure. When I came to refit things the internal cable seemed quite tight when I tightened up the screwed connection and when I went for a drive the speedo is now recording 70mph when I'm doing 20 and when I stop it now sits at 60mph. I think I must have crimped the end connection on too far up the cable so the inner has put pressure on the internals of the speedo and maybe distorted things.
Can anyone recommend a company that can check and sort out speedos? Just found a company called JDO that can repair for £30. Anyone have any experience with them?
http://www.jdo1.com/Speedometers.html
Thanks.
Can anyone recommend a company that can check and sort out speedos? Just found a company called JDO that can repair for £30. Anyone have any experience with them?
http://www.jdo1.com/Speedometers.html
Thanks.
Edited by KKson on Sunday 11th January 11:38
If you disconnect the cable, does the speedo fall back to zero?
The way these instruments work, there's a magnet attached to the end of the drive cable, so it spins with the cable. The magnet sits inside, but doesn't touch, a steel cup, that in turn is attached to the needle. As the magnet spins it induces a field into the cup that deflects the needle against its return spring. For the needle to be stuck up the scale, it would, as you say, require something to be rubbing or touching, that shouldn't be.
I recall as a 17 year old thinking it might be a good idea to squirt some oil into the back of my speedo: by the time my Simca 1100 was doing 10MPH the needle was off the end of the scale
- the cup had filled with oil, forming a hydrostatic coupling 
The way these instruments work, there's a magnet attached to the end of the drive cable, so it spins with the cable. The magnet sits inside, but doesn't touch, a steel cup, that in turn is attached to the needle. As the magnet spins it induces a field into the cup that deflects the needle against its return spring. For the needle to be stuck up the scale, it would, as you say, require something to be rubbing or touching, that shouldn't be.
I recall as a 17 year old thinking it might be a good idea to squirt some oil into the back of my speedo: by the time my Simca 1100 was doing 10MPH the needle was off the end of the scale
- the cup had filled with oil, forming a hydrostatic coupling 
You may as well have bought a new cable from Cable Tec, was it your post asking about a replacement Speedo cable a couple of weeks ago? I can't remember and not looked back on the posts. I'm sure they do clock repairs too, we were very pleased with Cable Tec and the speedy turn around, I had read on some previous post that Speedy cable were not true to their name which is why I went to Cable Tec.
quote=KKson]Result- David Gerald has the correct cable in stock for £30 plus VAT. Checked out the speedo on the electric drill and all is well so it is only the cable that's causing the issue.
[/quote]
And postage, be around £40 to £42 then all in, would have been around the same price to het one made up, result then.
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And postage, be around £40 to £42 then all in, would have been around the same price to het one made up, result then.
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