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What is the Sierra 18-3647 160° MerCruiser Thermostat Kit used for?
The Sierra 18-3647 160° MerCruiser Thermostat Kit is a replacement thermostat kit for GM engines with standard cooling. It is designed for 1987 and newer GM engines and has a 160°F temperature rating. The kit includes the thermostat along with multiple thermostat cover and housing gaskets and an O-ring.
What engines does the Sierra 18-3647 thermostat kit fit?
This thermostat kit is specified for 1987 and newer GM engines with standard cooling. The product description does not provide additional engine model, horsepower, or serial-number details, so verify your engine's year, cooling configuration, and existing thermostat part number before purchasing.
What temperature is the Sierra 18-3647 thermostat rated for?
The Sierra 18-3647 thermostat has a 160°F temperature rating. This rating identifies the thermostat included in the kit and should be considered when verifying that the replacement thermostat matches the requirements of your GM engine with standard cooling.
What is included in the Sierra 18-3647 thermostat kit?
The kit includes a Sie-18-3649 thermostat, Sie-18-2844 thermostat cover gasket, Sie-18-2552 thermostat cover gasket, Sie-18-2553 thermostat cover gasket, Sie-18-7173 O-ring, and Sie-18-2917 thermostat housing gasket. These components are supplied together as part of the thermostat replacement kit.
What parts does Sierra 18-3647 replace?
The Sierra 18-3647 replaces Mercury 807252T8 and 807252Q5, Mallory 9-43157, EMP 75-03222, GLM 13101, Pro Marine 64252K2, and Redline RL3647. If you are replacing one of these listed part numbers, confirm that the application matches your 1987 or newer GM engine with standard cooling.
What should I verify before installing the Sierra 18-3647 thermostat kit?
Before installation, verify that your engine is a 1987 or newer GM engine with standard cooling and that a 160°F thermostat is appropriate for the application. The description does not provide installation instructions, so follow the product label and the applicable engine owner's or service manual for the correct replacement procedure.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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