omc thermostat housing gasket sealing

Recently replaced the thermostats on an OMC 1978 115. I noticed two small grooves cut in the adapter face (powerhead side). Sure enough, a fine jet of water would squirt from the groove. I didn't notice this before I changed the the thermostats.

Question - are these grooves supposed to be there? Are they a form of "telltale"? Or should I replace the gasket, use a silicone based sealant and make sure it is sealed 100%?

Thanks, Ben Gray

ben

Dec 19
2005

OK - found my answer. Thermostat housing should be sealed.

ben

Dec 19

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