The Sierra 18-1989 Thermostat replaces Mercruiser 861006A1, Mercruiser 8M0061381, Mercruiser 87290A4 for Mercruiser applications. It regulates cooling-water flow as the engine warms and cools, helping maintain the intended operating temperature.
Material:Â Stainless Steel
Fits:Â MCM/MIE GM V-8 (454 & 502 cid) engines
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-1989?
Sierra 18-1989 is an aftermarket thermostat for Mercruiser applications.
Which part numbers cross-reference Sierra 18-1989?
This listing cross-references Mallory 9-42500, Mercruiser 861006A1, Mercruiser 87290A4 and Mercruiser 8M0061381. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-1989 fits my Mercruiser application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
