The Sierra 18-3544 Thermostat replaces Johnson / Evinrude 435491, Johnson / Evinrude 437090 for Johnson / Evinrude Outboard applications. It regulates cooling-water flow as the engine warms and cools, helping maintain the intended operating temperature.
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3544?
Sierra 18-3544 is an aftermarket thermostat for Johnson / Evinrude Outboard applications.
Which part numbers cross-reference Sierra 18-3544?
This listing cross-references Johnson / Evinrude 437090, Mallory 9-43031 and Johnson / Evinrude 435491. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3544 fits my Johnson / Evinrude Outboard application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
