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Speedometer Repair


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When the magnet does not spin, I soak the end of the housing in Marvel Mystery Oil. It may take a couple of weeks to free it up. Try turning it ccw every couple of days. The second photo shows a severely damaged speedometer. The spring will have to  be replaced along with the needle. If it were mine, I would look for another unit.

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I filled a container with MMO and then submerged the portion of the speedometer housing that has the magnet. The container that I used was an old tin measuring cup, the housing just fit into it. I did not disassemble the speedometer, as it was a NOS one that had just been in its packaging for 75 years.

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Thank's Ken, your idea did loosen the magnet however there is still significant resistance . I will keep heating it with the wife's hair dryer over the next couple of day's. If that does not work I will remove the housing and try to squirt some contact cleaner down inside the magnet. I know the short cable just needs the nut removed to enable the cable to slide right on through with the unit. hopefully I won't drop it. 

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OK, Removed it from the main housing, that enabled me to shoot some contact cleaner then WD40 inside the lower drum . This loosen the old dried grease and I was able to clean it up . It spins like a dream. I will not lubricate it because I am not sure what is required.

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