[TR] TR4 Gremlins

[Roger Wilson]

Jim,

I replaced a nonfunctional temp gauge in my gt6 and the new unit read
extremely high when the engine warmed up. I replaced the sending unit &
voltage stabilizer and it didn’t change anything.

Then I calibrated the gauge -there are 2 adjustment ports covered with
black stoppers on the back. One of them adjusts the needle location. Using
a hand held HF digital sensor I adjust the needle to 185F, measured from
the thermostat housing, to the center mark of the gauge. Seems to work fine
now.

I think it was the adjustment screw on the left side looking at the rear of
the unit. It will look like you can adjust it with screwdriver, but the
metal is fragile. I ground down a hex wrench that fit snug in the opening
with a blade end and it turned easily with no damage.

Roger Wilson

On Mon, Sep 2, 2019 at 7:45 AM Dave Connitt <dconnitt at fuse.net> wrote:

> Hi Jim,
> Does the temperature gauge reading ever settle back to a normal reading?
> It will be interesting to see what suggestions you get. I fought the same
> issue and finally replaced the electrical gauge with one of those
> mechanical dual temperature/oil pressure gauges that other British cars
> have.  I filled the empty gauge hole with a mechanical oil temperature
> gauge.
> If you are interested I can send you a picture of the center gauges.
> Good Luck,
> Dave Connitt
>
> Sent from my iPhone
>
> > On Sep 2, 2019, at 10:22 AM, Jim Henningsen <trguy75 at gmail.com> wrote:
> >
> > Hello list,
> > Still tracking down the gremlins in my freshly restored TR4.  Replaced
> the
> > fuel sending unit and the voltage stabilizer and I now have fuel gauge
> and
> > temp gauge working.  The curious part is the temp gauge pegged to max
> temp
> > shortly after startup on fast idle.  I pulled the contact wire from
> sending
> > unit in thermo housing and reseated and the same.  Digital temp reading
> on
> > coolant in radiator was 165 and then up to 181 at operating temp at
> normal
> > idle.  Any thoughts on why temp gauge is going to max?  Bad sending unit
> > (its new)?  Doesn't like later TR4A neg ground voltage stabilizer?  Car
> is
> > set to neg ground.  62 TR4 CT5212LO.
> >
> > Thanks,
> > Jim Henningsen
> > Ocala, FL
> >
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