Another thermostat thread ;D

[Gizmoman]

I'll be getting a new thermostat as part of my AAZ rebuild and after doing some searching here, I can't find what I'm looking for.
Also, the one that was in the motor has 82c stamped on it - made by WAHLER in Germany. It does have the hole with the loose brass thingy.
The distance from the rim of the body to the seat plate is about 1.25. The depth of the seat inside the pump housing is 1.47. In other words, this never did close entirely (not sure if it's supposed to). I have found other brands that are listed for this engine but they all have the same dimensions (at least those that list dimensions). Obviously I'm missing something.


Another odd thing is that the new o-ring doesn't feel like its going to provide enough "squish". The cast aluminum cover looks like it's against the pump housing even before I tighten the two tiny bolts.

Is there a different seal I need rather than the o-ring that came with the new pump? The one I removed has a rectangular cross-section - I'd use it again but it seems a bit brittle.

Any feedback appreciated.