[TR] TR2 fuel gauge

[Greg Lemon]

Randall wrote: "I never did get mine very accurate across the scale; but it
pointed to 'E'
before I ran out of gas, and 'F' after I filled the tank, so I thought it
close enough."

I think that is about how they came from the factory, seems like the gauges
would usually spend about 3/4 of a tank reading over half a tank, then
seemingly run down the last half of the gauge very quickly.

Greg Lemon
TR250

On Mon, Jan 27, 2020, 6:37 PM Randall <TR3driver at ca.rr.com> wrote:

> Check that the resistor value has not drifted too much.  I don't recall the
> correct value for the TR gauge offhand, but it's not the same as the MGA
> that Barney "MGAguru" was working on.  It's worth checking the magnetic
> coils as well, not only for resistance but for a short to ground inside the
> coil.
>
> Also make sure both the gauge and the sending unit are securely grounded.
>
> When doing mine, I found that the tabs on the coils were not adequate to
> keep them from turning.  They have to be turned so the gap between the pole
> pieces and the moving armature is reasonably constant across the width of
> the pole piece; which you can only see with the face removed.  Mine wanted
> to turn so one corner was almost touching the armature.
>
> I never did get mine very accurate across the scale; but it pointed to 'E'
> before I ran out of gas, and 'F' after I filled the tank, so I thought it
> close enough.
>
> -- Randall
> 56 TR3 TS13571L once and future daily driver
> 71 Stag LE1473 - awaiting engine rebuild
> 71-2-3 Stag - awaiting gearbox rebuild
>
> > Listers,
> > I'm completing a restoration on a 1955 TR2.  The fuel gauge
> > isn't working.  Wiring is good, gauge was dead.  Finally
> > opened the gauge and found a broken wire.  Repaired the wire.
> >  Using mga guru instructions, I tried, for a long time, to
> > calibrate the gauge.  I can set the Full position, but can't
> > get close to calibrating the 1/2 mark.  When I get it close,
> > just the slightest pressure on the nut drives it to one end
> > or the other.  Took what I had for calibration and tried it
> > on the cars's 3/4 full tank.  It read about 1/4.  I'm
> > thinking that because the calibration for 1/2 tank is so
> > touchy, there is a bigger problem.  Any thoughts will be appreciated.
> > John DeLuca
> >
>
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