Re: change thermostat on 9.5hp
There is a gasket in there. Probably was re-used with a sealer.<br /><br />Try working around the gasket with a utility knife. If you try wedging it out, it may break the ears, so go slowly. I sacrificed a couple of chisels on exactly this problem without breaking the ears. If you don't have a new gasket, you can make one. Don't put sealer on it and next time it will come off easily.