Speedometer Jumping
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New User
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Speedometer Jumping
Speedo on my ‘63 F100 started jumping. It makes a clicking noise and jumps up about 20mph. The cable is just a year old and the splines on the drive gear at the transmission end are in good shape. Any suggestions? Will I damage the gauge if I keep driving it until I figure out a fix?
Senior User
Joined: Dec 2011
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Is the needle bent a little bit and now rubbing against the glass?
That happened to mine. If so, place some spacers between the front of the speedo and the glass when installing.
I glued some nuts to the speedo face to keep them in position for installation.
That happened to mine. If so, place some spacers between the front of the speedo and the glass when installing.
I glued some nuts to the speedo face to keep them in position for installation.
Lead Driver
Joined: Aug 2003
Posts: 6,305
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From: Boulder Creek, Ca
Replaced speedo cable and purchased a tube of the cable lube from popular online Ford part supplier. Found within several months the needle acquired the jitters, I removed the cable, cleaned and lubed using lithium grease; found there are differing opinions on which is best. Anyhow seems the jitters have settled down but I failed to lube the felt washer that sets inside the speedometer inlet housing..
Anyhow, food for thought??
Anyhow, food for thought??
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Thanks for the help. Speedo is still jumping. My guess is that the cable is not seating properly at the gauge end. I don’t know if the tiny nut near the end of the cable is supposed to engage or not. I you look at the pick, it looks like something has sheared off, but I’ve never worked back there and the parts manual pictures aren’t very clear. The gauge isn’t burned, that just the graphite.
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Lead Driver
Joined: Jul 2011
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From: Rockingham, VA
It looks like the end came off the cable and is stuck in the back of the speedo. Or is the end of the cable the same shape as the "hole" it goes into? It looks like the cable end is square and where it fits is round.
Was this a cable kit where you have to cut it to length and smash the end onto it?
Was this a cable kit where you have to cut it to length and smash the end onto it?
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Lead Driver
Joined: Aug 2003
Posts: 6,305
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From: Boulder Creek, Ca
Do you recall the part number on the replacement speedometer cable, if so, post the # perhaps member's can offer some suggestions?? I had an issue locating the correct speedometer cable for the 65 with the T-18, it appeared majority of the Ford part supplier's offered a generic cable but not specific for my application. Thanks to the help of members I was able to locate the correct cable.
As mention inspect the end of the speedo cable to determine if portion broke off, also check inside the cable housing.
The end of the speedometer cable end should be correctly aligned when inserted into the speedometer housing and make sure the threaded portion is aligned and hand tightened.
Anyhow, just tossing out food for thought?
As mention inspect the end of the speedo cable to determine if portion broke off, also check inside the cable housing.
The end of the speedometer cable end should be correctly aligned when inserted into the speedometer housing and make sure the threaded portion is aligned and hand tightened.
Anyhow, just tossing out food for thought?
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Finally - success!
After bench testing the speedo, I bought a new cable from Dennis Carpenter. It came with a metal sleeve and had no kinks or bends. The old one was only a year old, but I couldn't make it work. I pulled the new inner cable and dusted it with graphite, put it back together and after a few misfires it is working nicely. It was important to really tighten the cable onto the back of the speedo. Finger tight leaves about 1/16 of an inch for the inner cable to bounce in and out, which caused the jumping.
Thanks to all for the advice.
Thanks to all for the advice.
Lead Driver
Joined: Aug 2003
Posts: 6,305
Likes: 18
From: Boulder Creek, Ca
After bench testing the speedo, I bought a new cable from Dennis Carpenter. It came with a metal sleeve and had no kinks or bends. The old one was only a year old, but I couldn't make it work. I pulled the new inner cable and dusted it with graphite, put it back together and after a few misfires it is working nicely. It was important to really tighten the cable onto the back of the speedo. Finger tight leaves about 1/16 of an inch for the inner cable to bounce in and out, which caused the jumping.
Thanks to all for the advice.
Thanks to all for the advice.
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