The Sierra 18-3631 Thermostat replaces Mercury 135-300HP, Mercury 892864T04, Mercury 8M0174561 for Mercury Outboard applications. It regulates cooling-water flow as the engine warms and cools, helping maintain the intended operating temperature.
Fits:Â 135-300 Verado
Includes thermostat and housing
Temperature Rating: 144°F
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3631?
Sierra 18-3631 is an aftermarket thermostat for Mercury Outboard applications.
Which part numbers cross-reference Sierra 18-3631?
This listing cross-references Mercury 892864T04 and Mercury 8M0174561. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3631 fits my Mercury Outboard application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
