THERMOSTAT KIT

Function and Technical Context

The REC13280 thermostat kit is part of the Johnson Evinrude V6 Crossflow 143 °F outboard engine cooling system, regulating the water temperature in the cooling circuit to keep the engine within the optimal operating range. The thermostat acts as a thermal control valve: it remains closed during warm-up so that the engine reaches its operating temperature quickly, and it opens progressively to allow cold water to circulate once the set threshold is exceeded. A damaged or stuck thermostat causes the engine block to overheat, resulting in power loss, increased fuel consumption, or, conversely, an engine that fails to reach operating temperature and produces excessive internal condensation. This kit includes all the components necessary for a complete replacement: part numbers REC6F5-12411-03, REC27-62386001, REC321184, REC317245, REC320880, REC321222, REC321221, REC321220, and REC321027, ensuring a comprehensive repair without the need to purchase additional parts.

When should this part be replaced?

The most common symptoms of a faulty thermostat in outboard motors include the high-temperature warning light coming on repeatedly, abnormal fluctuations in the temperature gauge, the engine warming up excessively slowly, or, conversely, sudden overheating even when the cooling system is in good condition. It is recommended to inspect the thermostat during every seasonal maintenance check or every 300 hours of operation, as limescale buildup and corrosion typical of the marine environment accelerate its deterioration. Replacing the thermostat as a preventive measure during the winter layup prevents serious engine block or cylinder head failures that would result in much more costly repairs.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer Part Numbers