Good idea. Thanks. I can’t remember if the little check ball or vent on thermostat goes up or down or does it matter? Also I was reading another of your post from years ago about some thermostats hitting in housing before correct o-ring compression. It will be close but don’t really have accurate way to measure from block to end of thermostat. my new housing will be here tomorrow so I can measure that part.
Up if possible, it's a small bleeder.
For the thermostat/housing interface, you would need the new housing. Put the thermostat and seal into the housing and see if it hits the housing when you try to press it in. I had a couple that I shaved down the housing side of the thermostat to make them fit. It was a thermostat issue as the center pin was a touch taller than the original. It's been a while, not sure if I used a file or the grinder.
I remembered! The thermostat should fit flush in the cover without the O-ring. Then you will know it will apply enough pressure to the O-ring to seal. The ones I had to shave down would not contact the surface fully.