About that erroneous speedometer...

June 1, 2011 | By Richard Prince


In regard to Jeffery Huntsman’s speedometer showing a higher reading than it should (January), the likely cause is the speedometer cable or housing being bent, or the cable is binding because it’s dry or has the wrong kind of grease inside the housing.

If the cable is binding, it will “torque up” and when it breaks free it will spin the inside of the head faster than normal causing the speedometer to read erroneously higher.

This can be simulated with a speedometer by spinning the input with a sudden blow from your finger or something like an electric drill. The speedometer needle will jump higher and then settle back to a lower reading.


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