Remove the gauge from the dash. Unscrew the font
chome ring to remove the face glass. Place the
sensor bulb in boiling water. Pull off the
needle, reposition it to point at 212dF, and
press it back on. You can then use a thermometer
with variable water temperatures to check if the
gauge reads correctly at diffeent temperatures.
When it works properly it can read higher
temperatures up into the oil pressure range. The
temperature needle should run out of mechanical
travel around 82-psi (if you can warm it up to
about 250dF). If it stops before it gets that
far, then the bourdon tube may have been stetched
beyond its electic limit by overheating, in which all bets are off on accuracy.
Barney Gaylord
1958 MGA with an attitude
http://MGAguru.com
At 05:04 PM 10/7/2018, Max Heim via Mgs wrote:
>I just got the engine back together, but now the
>temperature gauge is malfunctioning.
>
>It seems to have got stuck at about 220.
>Thatâ??s what it was reading before I even tried
>to start the car. After warming up to operating
>temp (estimated, of course), the gauge had
>climbed into the oil pressure zone, reading at
>85 psi. At this point my cheap temp gun had the
>thermostat housing at around 180.
>
>Anyone seen this before? Any suggestions?
>--
>Max Heim
>'66 MGB
>....
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