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Discussion Topic:
Speedometer
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51f1 |
11-23-2009 @ 5:18 PM
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Senior
Posts: 573
Joined: Oct 2009
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Why does my 1951 truck speedometer pointer bounce? I have a NOS speedometer The pointer bounces below 25 mph. The slower, the more it bounces. Above 25 mph it is rock solid smooth. Richard
This message was edited by 51f1 on 11-23-09 @ 5:21 PM
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40guy |
11-23-2009 @ 5:36 PM
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Posts: 270
Joined: Oct 2009
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This is common with old speedometers. The bounce at low speeds is due to the fact that the speedometer has spent most of its life in this range and the internal components are more worn in this area than others i.e. higher speeds. I have never known the bounce to be a problem and the only remedy is probably a complete rebuild with new gears etc. However; I just let em bounce.
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carcrazy |
11-23-2009 @ 7:37 PM
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Senior
Posts: 1656
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You might want to try lubricating the speedometer cable. Pull out the inner cable and if it is frayed, replace it.
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51f1 |
11-24-2009 @ 2:08 AM
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The cable and the speedometer are new. I have pulled the cable and lubricated it. There shouldn't be any wear on either.
Richard
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mvillebob |
11-24-2009 @ 12:36 PM
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Richard, The lube should help. Also, make sure there are no sharp turns in the cable housing. Lets us know what happens with the lube. Best,
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37RAGTOPMAN |
11-24-2009 @ 4:58 PM
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Make sure you use GRAPHITE LUBE on the cable, you could also remove the speedo and use a drill and lube the drive unit when the speedo is upside down, do this very carefully, [ make sure you are going in the right direction ] ,I have freed up quite a few speedo using this process, it might be in the shaft,that come out of the back. make a square drive from a old scewdriver,and a grinder, and see if the shaft coming out of the speedo is hard to turn, if it is a few drops of oil might free it up, hope this helps 37RAGTOPMAN LETS HEAR HOW YOU MADE OUT,,,
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tudorbilll |
11-24-2009 @ 11:24 PM
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New Member
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You can buy the fluid and fill it yourself.Comes whith instructions. I did mine about 15 yrs ago.Be carful taking it dont break it. its not a fun place to work they never are. Get a trouble lite and take a look.the air in that little line is pushed buy the gas in the tank.more gas more push. the air in the line in turn pushes the fluid up in the tube. Even when your done I would keep track of miles I drive.After a fillup you can go about 150 miles,you have a 14 gal tank so you drive on about 10--11 gal.
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supereal |
11-25-2009 @ 6:00 AM
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As the cable is new, be sure it isn't just a small bit too long. If it is, it will cause needle jumping from being jammed in the sheath and/or at one end or the other.
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51f1 |
11-25-2009 @ 7:29 AM
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Senior
Posts: 573
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Why does this problem occur only below 25-30 mph? I installed the NOS speedometer and a new replacementcable over a year ago. I haven't devoted my full time to this problem as it is part of a long-time body-off total restoration of my truck, which I just finished with the installation of a new bed. When I installed the cable, I felt that the inner cable was a bit long and ground off some of the speedometer end. I later loosened (backed off) the attachments on both ends in case that was forcing the cable too far in and causing binding. Those two actions seemed to help by confining the bouncing to below 25-30 mph. I think that I will connect my drill motor to the lower end and spin the cable to see what happens. If the speedometer works o.k., that means it may be a problem with the drive gears (unlikely) or the Chinese inner cable is still too long (more likely). But why does the problem occur only below 25-30 mph? Anymore ideas?
Richard
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JebNY |
11-25-2009 @ 6:04 PM
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Posts: 44
Joined: Nov 2009
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Turning slower the resistance is allowing it to grab.
Jim... 1950 F1 Stake
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