IMPELLER 47-8037481 REC3B2-65021-1

Function and technical context

The impeller is the central component of the water cooling system in Tohatsu engines, responsible for pumping coolant through the circuit to maintain optimal operating temperatures. This flexible rubber rotor rotates driven by the drive shaft, generating the necessary flow to extract heat from the engine and prevent overheating. Its correct operation is critical for the durability of the engine, since a worn impeller significantly reduces the efficiency of the cooling system, potentially causing overheating and serious damage to cylinders and gaskets.

When to replace this part?

Impellers should be inspected regularly, especially after periods of heavy use or if the motor shows signs of overheating such as frequent thermal alarms or reduced cooling flow. It is recommended to change the impeller preventively every 300-400 hours of operation or annually before the start of the boating season, depending on the conditions of use. Timely preventive replacement prevents costly breakdowns at sea and ensures that the cooling system maintains its maximum efficiency throughout the life of the engine.

Equivalent manufacturer part numbers