Description
SIERRA 125°F Mercury/Mariner 2.5-6 HP Outboard Thermostat – 18-3638
The SIERRA 125°F Mercury/Mariner 2.5-6 HP Outboard Thermostat – 18-3638 is a marine cooling-system replacement component designed for Mercury/Mariner 2.5-3.5 HP (0R131842 and up) and 4-6 HP (0R411838 and up) outboards. Its 125°F (52°C) operating rating helps the engine reach and maintain the intended cooling-system temperature. It is a fit-specific service part; confirm the engine model, serial range, cooling configuration, and OEM interchange before installation.
- Designed for Mercury/Mariner 2.5-3.5 HP (0R131842 and up) and 4-6 HP (0R411838 and up) outboards
- Thermostat temperature rating: 125°F (52°C)
- Helps regulate coolant flow as the engine reaches operating temperature
- Direct-fit replacement for the specified marine engine applications
- Suitable for preventive maintenance or replacement of a sticking/corroded thermostat
Specifications
- Manufacturer: Sierra
- Part Number: 18-3638
- Product Type: Thermostat
- Application: Mercury/Mariner 2.5-3.5 HP (0R131842 and up) and 4-6 HP (0R411838 and up) outboards
- Temperature Rating: 125°F (52°C)
- OEM / Aftermarket Interchange: Mercury Marine 804540
- UPC: 808282375430
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