Leaking diaphragm... AGAIN.

[Rawze]

(11-16-2019 )Evotrucker Wrote:  

(11-15-2019 )Lonestar10 Wrote:  my thermostat had those same wear marks after only being in the engine 6 months when we did my head i went from the 190 i had put in back to a stocker.

So i tested the thermostat with some boiling water and it worked just fine.

I'm going to finish up the job tomorrow and go on from there.

I have found that if the brass ring is distorted and the thermostat is tight in it, then it will hang up and cause issues with the water temps.

When I install a new one, I always check it for this, and when needed, I will usually also use a dremel /w sanding disk to adjust the turkon seal inside the brass ring a bit if needed to make sure it is not a too tight fit to the moving part of the thermostat.

Yours looks like it was possibly scraping pretty hard on one side in those pics.