Re: Speedometer / Cable

Posted by 39SixSedanMan On 2023/8/20 8:11:33

Wheelhorse, all,
As Kevin pointed out, the small brass cup and wick allow a lubrication point to the input magnet shaft. It is important to keep this lubed as it gets quite a bit of rotation, thousand RPM at 60 miles an hour.
However, lubricating this point will not correct for a weak magnet or other obstruction keeping the pointer from moving to an accurate speed. Also deeper inside the speedometer, the odometer geartrain also can suffer from old dry lube. Unfortunately the engineers never figured out a good way to provide lube to all those different internal points from the outside of the unit.

Regarding the cable, although graphite will not hurt it, originally, the rotating inner core was given with a thin coat of grease; you don't want to pack it in or pump it in from the bottom. I've repaired many speedometers of which somebody had pumped grease up through the transmission and and all the way into the speedometer making one amazing archaeological dig for me to explore. A little grease is all you need.

I hope this helps, Pat