Hey Alan,
Since one else has jumped in yet I'll give it a stab...
Depending on your elevation above sea level, a reading just to the right of
center could be good. Water boils at a lower temperature the higher the
elevation. Next time you test on the stove, borrow the wife's meat
thermometer and confirm how hot the water is, boiling doesn't always mean
212*F.
As for the longer capillary tube, maybe the COE's had longer ones, just a
guess...
Tapping the glass sounds like the gauge is sticking and or bad, or a loose
wire.
Good luck,
Mike Boteler
'56 4400 Stake
'56 6400 Stake
'56 8400 Wrecker w/Holmes 525
'56 9200 Tractor w/Allison Automatic
'57 10500 Fire Truck
Hughesville, MD
----- Original Message -----
From: "Alan Quin" <alquin@telus.net>
To: <oletrucks@autox.team.net>
Sent: Wednesday, May 26, 2004 11:23 PM
Subject: [oletrucks] Fw: Water temp gauge question
> Can any one of you experts out there help with a couple of things that
have
> arose while doing a reading test on a stock A.D. water temp gauge. Letting
the
> mercury bulb sit in a boiling pot of water on the stove, the needle will
go no
> further than just to the right of center.Does this mean the unit needs
> serviceing. I wish to install in place of an electric GM gauge 6V. I had a
> chap install in my 12V. 350CI system. It works only if I rap the Gauge
glass,
> right to 220 Degrees.The engine has never overheated and I suspect the
> gauge.How accurate are the bulb type units I 'm lucky to have obtained ?
Also
> the copper line to the bulb seems long enough to get to the thermostat
housing
> on my V8. Am I dreaming or did some trucks use a longer tube? Any
suggestions
> to these queries woald be appreciated . Thanks Al Quin 52 Canadian GMC
Half
> ton 350 Powerglide.
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