Speedometer Problems for 64 F100
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Joined: Mar 2004
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Speedometer Problems for 64 F100
I hope someone out there can help. My speedometer cable broke. After I replaced it, my speedometer reads about 15 - 20 miles per hour less. So If I get caught driving at 80 mph, I can tell the officer I was only going 60. Does anyone know whats wrong.
Thanks
Thanks
Logistics Pro
Joined: Feb 2000
Posts: 3,565
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From: Sun River St. George
Did you change the drive gear? Just replacing the cable should not make any changes in the reading. Make sure the cable "lays" properly with no sharp turns or kinks. Keep it off the exhaust system as well.
Laughing Gas
Joined: Oct 2001
Posts: 957
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From: Winchendon MA
Did you use one of those make your own kits? If so you might have made it just a little to long on the speedo end this would / could put presure on the drive unit in the axial direction thus add some friction to the movement.
Speedos work by haveing a wheel with a pair of magnets spinning on a drum on the outside of the drum is a second drum/disk with two fingers that hang down the magnets try to hold the fingers still but they can't but it will move the fingers at a know angle the pointer on the speedo it attached to the fingers. so you might have some added presure from the cable.
Did you grease the new cable?
Did the old cable ball up inside the caseing? if so it could have damaged the plastic teeth on the drive gear thus it might not turn the cable at the full speed.
Best of luck
44
Speedos work by haveing a wheel with a pair of magnets spinning on a drum on the outside of the drum is a second drum/disk with two fingers that hang down the magnets try to hold the fingers still but they can't but it will move the fingers at a know angle the pointer on the speedo it attached to the fingers. so you might have some added presure from the cable.
Did you grease the new cable?
Did the old cable ball up inside the caseing? if so it could have damaged the plastic teeth on the drive gear thus it might not turn the cable at the full speed.
Best of luck
44
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Thankyou. I did order the cable from a ford parts cataloge and did notice it was alittle long. I cut it down about 1/4 of an inch and it did fit better but maybe I still have some friction. I did use some liquid graphite but didn't do it when I installed the cable - I tried to poor it down the cable (probably should have pulled it out and made sure the whole cable was lubed?????.
I checked the plastic gear (original) and the teeth are good.
I checked the plastic gear (original) and the teeth are good.
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