Ok, now I'm interested. After hacking the thermostat which came from my ST apart to determine failure root cause, I'd do it differently next time. I'd like to check for:
I'd do this by first removing the heat motor from the frame and photographing the actuating rod near the entry to the housing extension. I'd then test to see if the actuating rod is free to move (my guess is no) and finally, de-cap the heat motor by chucking the body in my lathe and cutting off the rolled seals on either end, freeing the extension and diaphragm on one end and freeing the rear steel extension to check for wax leaks from the back of the plug chamber.
As mine is already in pieces, I'd be interested in having a go at a few others, anyone interested in a bit of an experiment? All I really need is the heat motor with actuating rod but if you'd be so kind as to give your old, stuck open thermostat a good rinse and mail it this way, I'd like to gather some data.
-Scot
- Stuck actuating rod
- loss of diaphragm integrity
- condition/location of the piston and seal
- condition of the wax plug
I'd do this by first removing the heat motor from the frame and photographing the actuating rod near the entry to the housing extension. I'd then test to see if the actuating rod is free to move (my guess is no) and finally, de-cap the heat motor by chucking the body in my lathe and cutting off the rolled seals on either end, freeing the extension and diaphragm on one end and freeing the rear steel extension to check for wax leaks from the back of the plug chamber.
As mine is already in pieces, I'd be interested in having a go at a few others, anyone interested in a bit of an experiment? All I really need is the heat motor with actuating rod but if you'd be so kind as to give your old, stuck open thermostat a good rinse and mail it this way, I'd like to gather some data.
-Scot
