Sierra 18-3544 Thermostat for Johnson Evinrude Outboard Engines

The Sierra 18-3544 is a high-quality replacement thermostat designed specifically for Johnson and Evinrude outboard engines. This precision-engineered cooling system component maintains optimal engine operating temperature, ensuring reliable performance and protecting against overheating damage.

Key Features:

• Temperature rating: 140°F (60°C) for precise engine cooling control
• Direct OEM replacement meeting or exceeding original equipment specifications
• Compatible with a wide range of Johnson and Evinrude 2-stroke and 4-stroke outboards
• Fits 75, 80, 90, 100, 105, 115, 150, and 175 HP models from the 1990s through mid-2000s
• Manufactured by Sierra International, a trusted name in marine aftermarket parts

OEM Cross References:

• Johnson/Evinrude: 435491, 437090
• Mallory: 9-43032, 9-43036

This thermostat is an essential maintenance component for keeping your outboard engine running at peak efficiency. Regular thermostat replacement helps prevent costly engine damage and ensures consistent performance on the water.