There's been a lot of informative and helpful replies to my jumpy speedo
problem, so I'd like to share what I've found. Today, I dropped in my
"backup" speedo that's geared for a 3.9 rear end. It was steady and
solid (well, at least as solid as any Healey speedo I've seen ;) This
indicated that the cable and right angle drive were OK, so I screwed up
the courage to disassemble the jumpy speedo. Besides some gunk from a
rubber buffer that is apparently used to isolate the movement from the
case (this stuff had turned gooey), there was no obvious problem.
So, I started turning the mechanism with a small screwdriver and lo and
behold, it's binding at a regular interval. On closer inspection, I
noticed that one of the small gears that drive either the odometer or
the trip meter had a radial crack and, sure enough, that's where the
binding occurred. Long story short, I believe the movement would bind
every 10 or so turns of the cable, causing the cable to wind up then
release when the binding area moved past the worm gear.
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Bob Spidell San Jose, CA bspidell@comcast.net
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