The Sierra 18-3550 Thermostat is designed to regulate engine operating temperature by controlling cooling-water flow in Mercruiser applications. It replaces Mercruiser 59078.
Fits: Mercruiser 120/2.5L (s/n 2324347 & Up) w/cast iron exhaust manifolds
Fits:Â Mercruiser 140-3.0L (s/n 0L340999 & below) and 165
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-3550?
Sierra 18-3550 is an aftermarket thermostat for Mercruiser applications.
Which part numbers cross-reference Sierra 18-3550?
This listing cross-references Chrysler / Force F84068, Chrysler / Force F84068-1, Chrysler / Force F84068-2 and GLM 13020. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-3550 fits my Mercruiser application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
