Doug,
On the '73, the ignition timing is retarded at idle (for emissions purposes).
Unfortunately, retarding the ignition can cause overheating. The purpose of
the thermo switch is to interrupt the vaccum retard when the engine coolant
gets too hot. This advances the timing and allows the engine temp to cool. If
your emissions standards are like California, you will have to hook up the
hoses even though your switch probably no longer functions (and the switches
are NLA).
Hope this helps,
Hugh Barber
Hollister, CA
'73 TR6
On Tue, 23 October 2001, Doug Nicotera wrote:
>
> I've recently purchased a 73 TR6 that has been garaged for many years. In
> preparation to start it up, I'm doing and replacing all of the recommended
> stuff.
> I've got a question, though, about the thermostatic switch that is placed
> in the top radiator hose. I can see from Bentley's workshop manual that
> there are two vacuum pipes that should be atached to this valve. I also can
> see that one should be atached to the rear carb. Due to a PO, however,
> there are no lines attached at the moment.
> Here's my questions:
> 1. what does the switch do and what should the vacuum pipes be attached to?
> 2. should these be hooked up to run the car at length? In other words, is
> it mechanically and environmentally correct to fix this?
> Any advice would be greatly appreciated.
> PS-thanks to all who replied to my recent "test" message. All is working well.
>
> Doug Nicotera
> 73 TR6
> Harrisburg PA
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