[Healeys] Speedo Info (Pt. 1)

[Bob Spidell]

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 at comcast.net
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