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The rotating speed
reading dial was stuck at the near zero position and only a sharp tap of the
hand whilst driving would make the dial free to move. It would then work fine
until the next prolonged stop.
As I have not been able to source much information [if any] on this type of speedometer, this article is my experience and the parts names are probably not correct to those given by Lucas.
Tools required: 1 x set of Jeweller’s screw drivers: 1 x tweezers; 1 x small vice or clamp; 1 x clean cloth; 1 x small brush; 1 x small pot of cleaning liquid [paraffin].
Start by removing the speedometer from the car and return to a room with plenty of light.
Inspection of all the parts and very careful cleaning is required. I would leave the rotating speedo face alone as the painted-on numbers are very easily removed.
Re-assembly is basically the reverse of the above but great care and time is needed to ensure that the rotating speedo plate is carefully assembled and the hair spring is back under the screw. There is a very delicate spring finger which prevents the speedo plate from lifting and this can be easily distorted. If the job is not rushed, all goes back as it was.
The reason for the speedo plate sticking was the result of the plate with the numbers on it becoming detached from the small spindle.
This article, written by Mike Davies, originally appeared in CA7C Seven Focus in Feb 2009 pp 16-19.