Roger Moment and I reviewed the one-page flyer that Mike Grant from Moss sent
us. It shows and describes in detail the two sliding-sleeve thermostats Moss
sells. In Roger's opinion, the Moss part 434-165 bellows-type thermostat is
the correct one to use on all Austin-Healeys, but it should be noted that a
seven-pound cap, as original, should be used in conjunction with this
thermostat.
Moss also sells a "wax capsule" thermostat that does have a sliding sleeve,
but it is designed to work with higher-pressure systems using e.g. a 12-pound
cap, and in Roger's view, running a higher pressure in the cooling system might
not be a good thing in Healeys and could lead to other problems.
The worse that's going to happen with an original thermostat and seven-pound
cap is that if the system overheats seriously, the pressure will be exceeded
and the excess coolant will spew out the overflow hose. If that's of concern,
one might consider installing an overflow/return tank that allows the coolant
to return as the system cools down.
Cheers
Gary
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