[T3] my long term issue have to unplug TS1 for a smooth idle.

[William Jahn]

Jim;

 Here's the link to the AAR not my photo's , scroll  down to Rays it shows
the pin and stop and why you can't get the spring on wrong.

https://www.thesamba.com/vw/forum/viewtopic.php?t=610070&highlight=aar

On Tue, Oct 1, 2019 at 1:51 PM Jim Adney <jadney at vwtype3.org> wrote:

> On 1 Oct 2019 at 11:03, William Jahn wrote:
>
> > You can't get the flat wound thermal spring on wrong because the
> > valve stem is slotted to fit the inner most part of the spring the a hole
> > in the slotted shaft for the screw and spring for the +/- adjustment the
> > hole is slotted .
>
> I'm at a disadvantage here because I've never been inside one of the AT
> AARs, but I'm willing to believe that the design is at least similar to
> the MT
> version. The MT version was designed first and the only change they had to
> make was to add electric heat to the the AT version. The parts you
> describe
> sound much the same as the MT version.
>
> With the slotted shaft, it's easy to rotate the spring by 180 deg.
>
> When adjusting the +/- screw in the slot. It's easy to over/under-think
> that
> and get it backwards.
>
> > Over years of heating and cooling cycles I imagine the spring changes I
> > just adjusted to the far end of the slot so it would close sooner it's
> > marked with a red dot center on screw factory calibration.
>
> The MT versions don't seem to have a problem with the "spring." The only
> problem they have is that the zinc metal housing warps over time and
> causes the valve to stick. I regularly fix these. The AT version also
> appears
> to have a zinc die cast housing, but it's much harder to take apart.
> That's
> unfortunate, because the only problem I've seen with them is that they get
> stuck in one position.
>
> That "spring" is a bimetal strip, a very well understood mechanical temp
> sensor. I don't see long term fatigue problems in these at all. All older
> heating thermostats have them, and they last for decades. I replaced our
> home thermostat a few years ago, but not because of the bimetal strip.
> That
> thermostat was nearly 80 years old by that time. I know someone at
> Honeywell who once told me that the only thing that ever fails in their
> old
> round thermostats was the wires that flex every time the bimetal spring
> moves the mecury capsule. They don't sell thermostats with mercury any
> more, but the old ones never had trouble with the bimetal strips (which
> were
> also wound in a spiral, like our AARs.)
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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