Running at the optimum temperature maximizes performance.
A failed or failing thermostat can cause an engine to run at outside of its optimum temperature and adversely affect performance and efficiency. Getting back to the right temperature can be as simple as replacing the thermostat. Sierra makes sourcing parts for the job easier by packaging the thermostat and gaskets for an out of the box installation. Each Sierra part is engineered to meet or exceed Mercury specifications to assure boaters and technicians it will fit right the first time and restore function to OEM specifications.
Use our Engine Parts Selector or call 1-800-BOATING with your outboard’s serial number to confirm this kit is correct for your Mercury
Key Features
- Thermostat meets or exceeds manufacturer specifications
- Temperature rating of 160°F (71°C)
- Complete kit includes thermostat and gaskets to eliminate time spent sourcing individual parts
- Thermostat replaces Mallory 9-43100
The Sierra Engine Parts Selector
In addition to thermostat 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.





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