140 Degree Thermostat Kit | Sierra 18-3650
140 Degree Thermostat Kit | Sierra 18-3650
Sierra
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140 Degree Thermostat Kit | Sierra 18-3650
140 degree thermostat fits multiple Mercruiser raw water cooled 4 cylinder marine engines.
- Fits Mercruiser model 120 153CID raw water cooled engines from 1968 to 1972 with serial number range 2324347 to 3377340
- Fits Mercruiser 2.5L 153 CID raw water cooled engines from 1987 to 1989 with serial number range B531854 to C853255
- Fits Mercruiser 3.0L 181 CID raw water cooled engines from 1987 to 1989 with serial number range B450801 to C856558
- Kit includes 18-3550 140 degree thermostat and 18-2831 housing gasket
- Replaces Mercury 59078
- Replaces Mallory 9-43020, 9-43153
! 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.