Thermostat too dirty

Z

ZafSC

Seaman Apprentice
Joined
Apr 9, 2023
Messages
42
Hello. I removed the thermostat last fall during winterization, and now I wanted to install the new one, but the hole inside it look extremely dirty. Looks like grease and mud, not exactly sure. I didn't notice it previously, because it was full of water (or antifreeze) previously.
Attached are the pictures. Is there some method to clean it before I install the new thermostat? Or I just ignore it?
Thanks
 

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Scott Danforth

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,621
use a wire brush to remove the rust flakes, install new thermostat, sleeve, and gasket and go boating.

extremely common on a raw water cooled boat in either fresh or brackish water.
 
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