18-3647D Thermostat Kit for Mercruiser Stern Drives

Maximize performance and efficiency by running your engine at the optimum temperature

A failed thermostat can cause an engine to run at outside of its optimum temperature adversely affect performance and efficiency. The fix can be as simple as replacing the thermostat. Sierra makes it easy by packaging the thermostat with all the necessary components for an easy out the box installation. This thermostat has a temperature rating of 160° and is designed for use with many GM based engines newer than 1987 with standard cooling systems. Gaskets and O-rings are included to make the job quick and easy.

For 50 years Sierra has been producing parts engineered to meet or exceed the specifications of marine engine manufacturers and has gained the confidence of engine manufacturers and boat builders to a point of supplying them with OEM parts. Boaters and technicians can be assured a Sierra part will fit right the first time and restore function to OEM specifications.

Key Features

• Thermostat meets or exceeds manufacturer specifications
• Complete kit includes thermostat, gaskets and O-rings to eliminate time spent sourcing individual parts
• Temperature rating of 160°F
• Compatible with 1987 and newer GM based engines with standard cooling

The Sierra Engine Parts Selector

In addition to carb kits, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see our Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.