David, I have taken the speedo apart on both the Tiger and Alpine
several times. See article in United.
The current wisdom is that the speedo cable when the nut on the cable is
screwed to the speedo is not support ot hit or bottom out on the
receiver for the cable. This is support to ruin the mechanism.
Current fixes are to measure the depth of the receiver, and length of
the protrusion of the cable and grind off excess so it will not bottom
out. Another fix currently used by MoMa is to add a o ring to the
cable, effectively moving the cable end away for bottom out in the speedo.
That said, I still don't see how a tight cable would effect the speedo,
as there is just a gear on this part of the speedo for the odometer, and
the speedo mechanism is floating in its own portion of the speedo. See
United article, or take yours apart.
In any event you can use current wisdom and if still not working then
the magnet is probably weak, the mechanism is shot, or the jewel for the
speedo is not there anymore. $$$$$$ and a pro fix.
Larry
You are welcome.
david.wedeking@teradyne.com wrote:
>There has been a lot of discussion about the effect of the length of the
>speedometer cable on the behavior of the speedometer. My question is: does
>the speedometer cable float inside the shell or is it retained at one end?
>I have an original shell (the outer, fixed part) with a replacement cable
>(core wire) replaced by a local shop 10 years ago. The cable floats freely
>in my setup. If this is normal, what keeps the cable from always pushing
>on the speedometer mechanism? My speedometer is operating in an unstable
>manor.
>
>
>David Wedeking
>1967 Tiger Mk 1A B382002420LRXFE
>Hillsboro, OR
>
>
>
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