The Sierra 18-3650 Thermostat Kit replaces Mercruiser 59078Q3, Mercruiser 59078T3, Mercruiser 59078T4 for Mercruiser applications. It renews the thermostat and associated sealing components used to regulate engine operating temperature.
Suits Mercruiser engines:
1998 & older MCM GM in-line 4 & 6 cyl. engines
140 degree F thermostat
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3650?
Sierra 18-3650 is an aftermarket thermostat kit for Mercruiser applications.
Which part numbers cross-reference Sierra 18-3650?
This listing cross-references Mercruiser 59078Q3, Mercruiser 59078T3 and Mercruiser 59078T4. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3650 fits my Mercruiser application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
