| mjdunn | -- 06-14-2014 @ 7:20 PM |
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On my 1939 Ford, the speedometer needle sticks if I go over 60 mph. I have to slow down to around 50 mph for it to come unstuck. Would the problem be that the speedometer cable needs to be lubricated, and if it does, how do I do that? Or, does the cable need to be replaced. If so, How do I do that? Michael Dunn
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| nelsb01 | -- 06-14-2014 @ 8:35 PM |
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Michael; First I would try and lube the cable. Graphite is a good lubricant. You can reach under the dash and unscrew the cable housing from the back of the speedometer. Gently pour the graphite down the cable housing. You do not have to remove the cable from the housing. You may not need much graphite. You can always add more. Re-attach the cable housing to the speedometer. Test drive. If it is the cable, you will need to know the length as it seems Ford cables were sometimes specific to each model of vehicle. Cables are available, but you will need the correct length.
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| 40 Coupe | -- 06-15-2014 @ 3:20 AM |
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It sounds as if there is some dirt preventing the needle from passing 60MPH. It does not sound like a cable problem. The cable rotates a magnet, the magnet rotates a cup with the pointer, the magnet and the cup do not physically touch each other. The magnet can rotate and the pointer stick if there is dirt in the bearings that support the cup and pointer.
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| mjdunn | -- 06-15-2014 @ 3:50 AM |
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Thank you for all of this good advise. I should have said that the indicator will go past 60mph, it will just stop at the highest point and then will not come back until you drop to about 50 mph. Would that make any difference in your answer 40 Coupe? Michael Dunn
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| trjford8 | -- 06-15-2014 @ 7:09 AM |
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It still sounds as if the problem is in the speedometer itself. Many times the speedometer needs to come apart and be cleaned. Dirt and old sticky lubricant are usually the culprits. See if you know someone with an extra speedometer and give it a try in your car to see if it does the same thing. This message was edited by trjford8 on 6-15-14 @ 7:10 AM
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| mjdunn | -- 06-15-2014 @ 10:36 AM |
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Thanks, very helpful. Michael Dunn
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| supereal | -- 06-15-2014 @ 7:47 PM |
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Your problem isn't unusual. The rear of the speedo depends on the pot metal case instead of a bushing or bearing. When it wears. The cable pulls it out of line, causing the magnetic discs to collide. It is likely that no one expected cars to last decades, so no improvements were called for. We send them to Bob's Speedometer in Michigan they have a website. They will examine the speedo and give you an estmate of the repair cost.
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