This discussion took place during my holiday in San Diego/Las Vegas/
Grand Canyon/Mohave and other Deserts, Quartzsite etc.
I have tried to respond but I am uncertain if anything at all came
through, the WiFi in most h/motels was atrocious, very slow.
For your information I still have the following sleeved bellow
thermostats available:
4 x AC TF1, 720C / 1620F
3 x AC TF3, 680C / 1540F
4 x AC TF4, 860C / 1870F
2 x Smiths 85025/.., 860C / 1870F
2 x Smiths 85025/.., 800C / 1760F
1 x Smiths 85025/.., 820C / 1800F
Smiths and AC thermostats are interchangeable/equivalent. Smiths was
mostly used as OE on the AH, AC on the TR2/3/4.
Officially these thermostats should be used with a pressure cap of no
more than 7psi to prevent collapse of the bellows, however I know of
several people that use 10psi pressure caps without any trouble.
If you have sufficient,meaning overcapacity of the radiator, or if your
engine does never run hotter than say 50 over the opening temperature of
the thermostat, use the 860C / 1870F thermostat with a 7psi pressure cap
plus proper overflow bottle. The engine will run better and more
efficiently. Fill up the radiator to the top of its neck and the
overflow bottle to half way with the tube reaching the bottom. After
topping up a few times all air will be expelled from the cooling system
and the radiator will be fully filled up with coolant.
If your car runs to hot at any time there is no way you can fix this
with an other thermostat with a lower opening temperature, you just buy
a little extra time only before the engine starts boiling
If you want to buy thermostats ($40 each, except the AC TF3 which will
be $55), get a few mates together (AH, TR2/3, Jaguar etc.) as shipping 1
thermostat to the US costs the same as shipping 13, i.e. $31 registered
post (parcel up to 2kg).
Kees Oudesluijs
NL
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