Re: [T3] Thermostats

[John Jaranson <jaransonT3@comcast.net>]

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On Jun 14, 2006, at 12:25 AM, Jim Adney wrote:

> On 13 Jun 2006 at 21:43, Keith Park wrote:
>
> > Question... what was in them? If I find the hole I could solder it up 
> > but
> > was there a vacuum in them? Special gas?
>
> It had to be something that boils at about 165F. Not very much of it;
> just enough to expand the bellows when it turns to vapor.

My understanding and experience is that when a thermostat fails due to 
a breech of the bellows, it expands to its full height.  This indicates 
to me that the free state of the bellows is expanded...so what ever is 
in there must change state (solid to liquid or more likely liquid to 
gas) at 165F as JIm stated.....but it must be put in and sealed at the 
hot state (expanded) and then as things cool down and it condenses (and 
shrinks), the vacuum created contracts the bellows.

I think this would make it harder to do a home repair on a damaged 
bellows.

Make sense?

Later,
John Jaranson
'66 Square (Sophy)
'70 Fasty (Jane 2 - Type 3 Lead Sled wannabe)
'71 Fasty (Jane -parts car due to rust)
http://mywebpages.comcast.net/carartbyjohn/
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