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| | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | I know I've read about this before but I can't seem to find it anywhere with the search.
What causes the speedometer needle to bounce?
I have a new cable and a rebuilt and cleaned speedometer in my '51 3100. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | the needle is moved by a magnet, it can only react to the movement of the cable if nothing is binding .... I'd think something would have to be sticky [likely what you recall reading about], unless maybe there was a bad drive gear in the trans
Bill | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | It spun fine with a drill. The drive gear is what I think I remember reading about. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | maybe drive it with the speedo end of the cable disconnected and feel it with fingers to see if it spins smoothly or is jumpy  Bill | | | | | Joined: Aug 2011 Posts: 835 Shop Shark | | Shop Shark Joined: Aug 2011 Posts: 835 | You might try unscrewing the cable a bit in case there is a mismatch with the cable length and cable housing length. It might be binding when screwed tight.
Kurt | | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | maybe drive it with the speedo end of the cable disconnected and feel it with fingers to see if it spins smoothly or is jumpy Bill You might try unscrewing the cable a bit in case there is a mismatch with the cable length and cable housing length. It might be binding when screwed tight.
Kurt Thanks Bill and Kurt! I'll give both of these a shot today. Any thoughts on the drive gear? I vaguely remember reading about it causing the same problem but I still am not finding any info on it. | | | | | Joined: Apr 2005 Posts: 1,971 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,971 | I think the problem lies in the speedometer head. shoot a little wd-40 inside the cable hole and drive it for a while. Eventually it will smooth out. | | | | | Joined: Sep 2010 Posts: 698 Shop Shark | | Shop Shark Joined: Sep 2010 Posts: 698 | Check the cable to make sure it isn't bent at any tight angles - the cable has to spin freely inside the casing.
My Fleet: 19411953195919651966 1953 Willy's Pickup John Vegetarian- old Indian word for bad hunter
| | | | | Joined: Mar 2011 Posts: 940 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 940 | I loosened the cable at the back of the speedo and it seems to have helped a bit but it's still not 100% I'm going to try a drop or two of naptha on the back of the speedo to see if that cleans things up any. | | |
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