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EFV-8 Club Forum / General Ford Discussion / Jumping Speedometer Needle

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Discussion Topic: Jumping Speedometer Needle

Dream38v8

10-13-2017 @ 12:43 PM

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I've reviewed the speedometer post from carcrazy and responses from 56MarII, nesbo1, BUCKAWHO, 1932BB and jwitt. The prior owner, of my '38 Deluxe, stated he replaced the cable twice. When I purchased the car 18 months ago the needle was jumping around again. Also the needle came loose and is laying at the base. I have looked everywhere for liquid graphite with no luck. On the web I located AGS Lock-Ease graphited Lock Fluid. Can I use sewing machine oil or 3-1? Should I purchase the AGS product? Once I remove the speedometer will I be able to replace the needle?

Ray

trjford8

10-13-2017 @ 6:01 PM

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The speedometer needle can be replaced and you will need to do the following: remove the speedometer and check around the chrome rim. You will see that it is crimped in about for spots to the housing. Be very careful to pry the crimps away from the housing as too much pressure in the wring area can break the glass. Once the rim and glass are removed you can replace the needle by simply putting it on the shaft and pressing downward. Prior to putting it back together you can remove the screws at the back of the housing and remove the mechanism from the housing so you can inspect it to see why it may be jumping around.

pauls39coupe

10-13-2017 @ 6:08 PM

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Speedo grease is still available, a tube will last a lifetime. I would check the cable housing for kinks and correct routing. It is not too close to the exhaust header or near a dual exhaust pipe, I hope!
You can fix it yourself or save a lot of grief by sending the unit to Bob's Speedometer shop in Howell Michigan.

supereal

10-15-2017 @ 11:52 AM

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More often than not, a jumpy speedometer is caused by wear of the case where the drive shaft enters the unit. The speedometer uses the die cast body of the instrument without what we would call a bushing. The wobbling allows the magnetic disks that drive needle against spring pressure. if the interval between the disks changes, or rub together the needle will jump or not move. Lubrication, other than the drive cable, will probably not help. We also use Bob's Speedometer. reach them at 1-800-592-9673.

fordv8j

10-15-2017 @ 4:47 PM

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I read in the times once about that problem, the guy loosened the nut on the cable a little, and it quit jumping, so he cut a little off the square end of the cable, it was apparently a little to long, this solved his problem, we have a 38 dlx coupe and a 38 conv. coupe, good luck

jdleach

10-16-2017 @ 9:50 AM

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I third the recommendation of using Bob's.

I have a '49 Ford F-2 that has been in the family for almost 50 years, and that I have owned since 1982. Started having issues with speedo around 1987. Went through my Cars and Parts and Hemmings mags and found out about Bob's. Sent the speedometer off to him for repair. After about a month or so, I got back what looked like a brand new speedo (same one, just completely reworked).

Here we are in 2017, and although the needle is faded, and it is beginning to bounce a little again, it still works fine. Called them up a couple weeks ago, and am getting ready to send the entire instrument cluster off for restoration.

They do outstanding work.

Dave

Dream38v8

10-16-2017 @ 12:47 PM

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I may try the home remedies first before using Bob's. It maybe awhile as I hurt my back. Hard to crawl under the dash with a bad back. I am not sure if the speedometer has ever been out. Bob's will probably be it later.

Thanks,

Ray

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