Geo,
I have the same problem with the tach in my TR3 it had a cable that was
to long and the DPO put too much grease in the cable, the grease worked
it's way into the drag cup causing the same problem you have. I cleaned
everything with alcohol and re-assembled the unit, this cured the
problem when testing the unit on the bench but hooking it up to the
cable it was back, shortening the cable has helped but I think running
it with too long a cable has caused some excess float in the drive end
of the drag cup assembly that I am going to have to address for it to be
totally reliable.
Doug Hamilton
1960 TR3A
1963 Fiat Cabriolet
Date: Wed, 14 Nov 2001 16:06:02 -0700
From: Geo Hahn <geohahn@theriver.com>
Subject: TR3 Speedo Woes
Note: I have consulted Tony Rhodes' excellent speedo site, I was unable
to access the archives....
The symptom is a speedo which gets hung up and does not want to return
to zero. Some jiggling of the cable or loosening of its fitting finally
causes the needle to drop back to zero. A new cable (Moss, black
housing) has recently been fitted.
I can recreate the problem with the unit partially disassembled by
applying pressure to the input shaft... this causes the needle to stick
until I relieve the pressure by pressing back on the hub of the pointer.
Is this play in the main works (being able to push everything fore & aft
about 25 thous) a normal float? Seems like it would need some float to
avoid binding.
ISTR some past comments here that the replacement speedo cables may be a
tad long and cause some binding in the unit. Is this in fact a problem
and is it resolved by grinding a bit off the speedo end of the cable?
I have resisted the temptation to lube anything inside the unit for fear
of attracting dirt and/or creating some adhesion between the magnet and
drag cup. Is there any lubing to be done?
Thanks for any help.
Geo Hahn
59 TR3A
Tucson
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