142 Degree Thermostat Kit | Sierra 18-3646
142 Degree Thermostat Kit | Sierra 18-3646
Sierra
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142 Degree Thermostat Kit | Sierra 18-3646
142 degree thermostat kit designed to fit many different Mercruiser raw water cooled marine engines.
- Fits Mercruiser model 215 Ford 302 CID raw water cooled engines from 1971 to 1972 with serial number range 3040411 to 3385720
- Fits Mercruiser model 228 GM 305 CID raw water cooled engines from 1977 to 1980 with serial number range 4765100 to 5907057
- Fits Mercruiser model 255 GM 350 CID raw water cooled engines from 1975 to 1980 with serial number range 4175500 to 5907057
- Fits Mercruiser model 260 MIE GM 350 CID raw water cooled engines with serial number range 0B522506 to 0F024999
- Fits Mercruiser 7.4 MIE GM 454 CID raw water cooled engines from 1988 to 1992 with serial number 0B788366 to D715493
- Kit includes 18-3551 142 degree thermostat, 18-2917 housing gasket, 18-2844 cover gasket, 18-2553 cover gasket and 18-2834 cover gasket
- Replaces Mercury 807252Q3
- Replaces Mallory 9-43151
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.