The Sierra 18-3647 Thermostat Kit replaces 807252Q5 and 8M0109441 in Mercruiser applications. It regulates engine operating temperature by controlling cooling-water flow as the engine warms and cools.
Suits Mercruiser engines:
3.0L (SN: 0L341000 and up), GM V6 & V8 with standard cooling.
160 degree F thermostat
OEM fitment: GM V6 & V8 Mercruiser engines, model years 1987-2016, with standard cooling requiring a 160°F thermostat.
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3647?
Sierra 18-3647 is an aftermarket thermostat kit for Mercruiser applications.
Which part numbers cross-reference Sierra 18-3647?
This listing cross-references Mercruiser 807252Q5 and Mercruiser 8M0109441. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3647 fits my Mercruiser application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
