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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

Speedometer jumping

Old Sep 6, 2014 | 01:12 PM
  #1  
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50trucking
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Speedometer jumping

My stock 50 F1 speedometer is causing problems and I need some assistance on pinpointing the problem.

First the needle would not stay steady when running at a steady speed. It would jump about 3 mph back and forth. I took the cable out and greased it with Vaseline it worked for a few days and went to doing it again. This time I greased it with white lithium. It worked for a while but now sometimes the neddle will jump back and forth all the way and some times it will stay pegged out and make a noise until I stop and it will come back to zero.

I am wondering if it is in the speedometer itself. Any thoughts are appreciated.
 
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Old Sep 6, 2014 | 02:43 PM
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Originally Posted by 50trucking
My stock 50 F1 speedometer is causing problems and I need some assistance on pinpointing the problem.

First the needle would not stay steady when running at a steady speed. It would jump about 3 mph back and forth. I took the cable out and greased it with Vaseline it worked for a few days and went to doing it again. This time I greased it with white lithium. It worked for a while but now sometimes the neddle will jump back and forth all the way and some times it will stay pegged out and make a noise until I stop and it will come back to zero.

I am wondering if it is in the speedometer itself. Any thoughts are appreciated.
Mine does that at times. Last time I took the cable out and greased it real good, and did what yours did, so I took it out again and examined it real close. I found several spots where the cable had kinked, so I spent some time trying to straighten them, re-greased the cable and reinstalled it. It was fine for a few days, but then when back to the erratic behavior again. I bought a new cable and casing and before I had a chance to install it, the old one started working smooth again. It's been that way for about two months now.... go figure.
 
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Old Sep 8, 2014 | 07:31 AM
  #3  
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From: central texas
bouncing speedo

time to replace the cable and housing.... it won't get better...
 
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