For What Its Worth
Fixing an old speedometer yourself
In my younger
days I tore apart speedometers. The old mechanical style is a
spring and a magnetic coupling for the needle. If it is not
moving, or barely, you may be able to open it up and check. May
need some cleaning and oil on the needle mount. Sometimes a piece
that is press fit begins to turn on the shaft. Epoxy can fix
that. Otherwise there is not a lot you can do.
If it is rusty/dirty don't forget to oil the odometer gears.
Watch what oil you use with plastic. Most oils will cause plastic to
swell/soften. I have Model train oil that works with metal
and plastic. Do not adjust the spring. It will change the
speed reading. Probability of success is about %15 since it is usually
a problem caused by too much wear. Who thought cars would go more
than a 100,000 miles in their useful life way back then.
VHubbard. May 2009
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