Re: Shutter-Opening Thermostat

Posted by Packard Newbie On 2021/10/17 13:25:07

Greenfield.
On my unit ('39) there are gaskets on BOTH sides of the Sylphon thermostat. I agree with you that the 'receiving' flange on the rad is less-than, but I'm not sure I'd put silicone on there to seal it, as errant gobs can really cause havoc in cooling systems. (or any internal system) The outer cover gasket on mine looked good upon removal, but the 'back' one came off in pieces. I remade it out of some good quality gasket stock and will seal it with a light buttering of 'Form-a-Gasket'. It is a zero pressure system, but hot antifreeze sure can find a leak-path if not perfectly sealed. Chris.