The Sierra 18-3543 is a 143°F thermostat for Johnson and Evinrude outboards, cross-referencing OEM numbers including 5005440, 437414 and 434841. The thermostat controls cooling-water flow as the engine warms, helping maintain normal operating temperature.
Temperature Rating: 143°F
Use With:
18-3673D - Thermostat Kit
18-3674D - Thermostat Kit
18-3673 -Â Thermostat Kit (V4 Crossflow)
18-3674 -Â Thermostat Kit (V6 Crossflow)
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3543?
Sierra 18-3543 is an aftermarket thermostat for Johnson / Evinrude Outboard applications.
Which part numbers cross-reference Sierra 18-3543?
This listing cross-references Johnson / Evinrude 378065, Johnson / Evinrude 393659, Johnson / Evinrude 434841 and Johnson / Evinrude 437414. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3543 fits my Johnson / Evinrude Outboard application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
