SIERRA 223-3666 Cooling Water Thermostat

Compatible Engines

The SIERRA 223-3666 cooling water thermostat is a critical component of the cooling system, responsible for maintaining the optimal operating temperature of your outboard motor. By precisely regulating coolant flow, it prevents engine overheating in demanding conditions while reducing warm-up time. With an opening temperature of 90 °C (195 °F), this part ensures stable engine performance, enhancing durability and efficiency.

As specific engine model compatibility data is not available in the source records, we strongly recommend verifying fitment. The safest method is to compare the catalog number 223-3666 with the OE (Original Equipment) number listed in your unit's manual. If you have doubts or need confirmation for a specific model, please contact our customer support team for assistance.

Installation and Operation

Replacing the thermostat requires caution and precision. Before removing the old unit, ensure the engine is cool and the cooling system is completely drained to avoid burns and leaks. When installing the new SIERRA thermostat, pay close attention to valve orientation and seal condition. We recommend replacing seals to ensure system integrity. After installation, refill the cooling system with fresh fluid of appropriate concentration before starting the engine to provide effective corrosion and freeze protection.

• Original quality and precision manufacturing by SIERRA.
• Optimal 90 °C opening temperature for stable operation.
• Effective protection against overheating and wear.
• Easy installation following standard safety procedures.
• Part number 223-3666 for precise identification.