Hi, I installed a complete speedo cable and speedometer but the needle still keeps jumping. What next?
jumping speedo needle
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Make sure you don't have a kink in it. Make sweeping bends in it as you route it up to the dash. Wouldn't hurt to drip a little oil down the cable either. -
If it's routed without any sharp bends then check to make sure both ends are engaged in their drives properly and check to make sure the rear output flange nut is tight as the speedo drive gear is driven by nothing more than a friction fit IIRC.
Jason T.Jason
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Originally posted by yocHi, Thanks for the reply Jim and Jason. I don't think it could be the cable being kinked. I'll check the rear output flange nut. Is that the nut with the locking washer just ahead of the od?
You have to remove the rear drive shaft to see it.
It should also have a cotter pin in the nut you would have to remove first before you can thighten it.
I hope this works for you.
I checked everything on mine before I finely replaced the speedo and all is well now.
Steve71 IIa 88
01 D2Comment
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Is the speedo new?
If not and if the Landy speedo is anything like the ones in my MGs, it's probably the speedo. Most Smith's speedos have a spinning bar magnet that rotates inside a shallow disc inside the speedo housing. The magnetic force drags this disc (rotates it) as the cable drives the magnet. The needle is attached to a shaft that passes through a brass friction bar and then attaches to the disc. Usually what happens is the one side of the magnet weakens and this unevenly "drags" the needle around. There is a margin of adjustment via the brass friction bar. To access it, remove the needle and face and you'll see it. The bar is supposed to dampen needle movement, so if you get too loose or too tight, the needle movement won't be smooth. It might be possible to re-magnetize the magnet, but I've never tried it. You can test the speedo by isolation with a square-drive bit in a drill. Hope this helps.© 1974 Apis Mellifera. Few rights preserved.Comment
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Wait.... ...some of them DON'T jump?1958 107 SW - Sold to a better home
1965 109 SW - nearly running well
1966 88 SW - running but needing attention
1969 109 P-UP
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If both are new, then my guess is lube, or too small a bend in the routing of the cable somewhere. Don't use a light oil, it just drips down to the bottom of the cable over time Either use a graphite lube, or a viscuss dino lube of some type. I've used lithium grease before because I did'nt have anything else at arms reach, and it worked fine.Travis
'66 IIa 88Comment
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