My understanding (and I use that word with a bit of caution) is that the
substance in there is a salt of some sort. The tube on mine broke off right
at the sender and that's what I found. But the expansion with temperature
still holds true as you thought.
I don't believe this is a do-it-yourself fix. Check with Palo Alto
Speedometer, I've had great luck with them and they can at least tell you
what you are up against here. Or they can do the repair if you wish -
probably much cheaper than replacement I would assume. I don't know if they
have any web presence but they can be reached at 650-323-0243. Usual
disclaimers of course.
Hope that helps.
Rich Williams
'60 SII 109sw "Lucy"
> I am trying to repair my dual Smiths oil pressure/temperature gauge. The
> oil pressure works fine but the temperature gauge won't budge. So, I have
> completely disassembled it and have found the only thing that can't be
> working is the temperature sender from the engine. To me it looks like
the
> sender is filled with liquid and a tube connects it to the gauge. The
> liquid must expand during heating creating pressure which moves the
needle.
> I guess the liquid in mine has leaked out or has air in the line. Anyway,
> it looks like at the end of the sender there is a small hole which has
been
> soldered over. It looks like this is the fill hole for the liquid. Is it
> possible to drill this out, refill and solder closed. If so, what is the
> liquid inside. Alcohol, maybe? If not, does anyone know where to get a
> temperature sender, or a complete gauge at a reasonable price?
>
> Mike
> 64 SIIA
>
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