#1  
Old 08-18-2019, 02:29 PM
elefantrider's Avatar
elefantrider elefantrider is offline
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Default '63 Tempest Speedometer

All of a sudden is making a ton of noise, and the needle is bouncing to 100+mph speed when I go over 30MPH. Can this be lubricated or does the it need to be taken out and sent to a speedometer shop.? What causes the needle to jump so much?
I disconnected the cable under the dash, could not stand the noise.
  #2  
Old 08-18-2019, 03:07 PM
Peter Serio's Avatar
Peter Serio Peter Serio is offline
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Wise move to disconnect the cable.

What has happened is your speedometer is completely dried out. This happens to all old cable driven magnetic speedometers. The cure is to remove the speedometer & send it to a repair shop. These speedometers are not field serviceable and at this age it's long overdue for an overhaul. Cleaning, inspection, replacement of worn parts. Re-magnetize and calibrate. This should be done around once per every 100,000 miles or 25 to 30 years whichever comes first. There are 2 oil-lite bushings inside of these speedometers. One big one and one tiny one. Over time (as well as miles) those 2 bushings dry out and the magnet shaft trying to turn inside of the bigger bushing without any lubrication is what is causing your pointer to "jump." Running one of these old speedometers dry; the magnet shaft gets all torn up by lack of lubrication, often to the point where it's ruined.

I have taken apart 6 old speedometers in the past month and; all of them the magnet shafts are ground up. The steel touch surfaces actually turn blue and purple on account of the heat (friction).
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Old 08-18-2019, 03:59 PM
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elefantrider elefantrider is offline
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Wow Pete......Good thing is right! Thanks.

Can spraying Teflon lubricant in the cable hole help to lube the bushing, at least temporarily?
For sure, I don't want the lubricant to hit the silkscreened(?)-number face.

How hard is it to remove the speedo only from the 63 cluster?
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Old 08-18-2019, 07:16 PM
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hobbygto65 hobbygto65 is offline
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In my experience it's your cable that needs to be lubed and nothing wrong with speedometer head. When the cable sticks it makes the needle jump.
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Old 08-19-2019, 01:05 PM
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Peter Serio Peter Serio is offline
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Default Speedometer Cable Lube.

I agree, try removing the center spinning section of the cable, clean and lubricate that first.

That's a really long cable, I think it's 118" or 121" inches long.

If that doesn't cure the jumping then by process of elimination, it has to be in the speedometer.

You say it's jumping form 30 MPH to 100, that's a pretty big jump. A dry or worn cable will cause the pointer to waver and bounce, sure. +10, +20 But +70 MPH jump I can't recall ever hearing of or seeing a cable that dry.

Try the cable first and report back. DO NOT USE White lithium grease on the cable!!!!! Try this:
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