MERCURY IMPELLER 47-89983T

Function and technical context

The impeller is a critical component of the marine engine's cooling system, responsible for pumping water from the inlet to the engine block to dissipate the heat generated during combustion. This element works directly coupled to the engine's transmission shaft, rotating continuously to maintain a constant flow of cooling water. Without an impeller in optimal condition, the engine suffers progressive overheating, which can lead to irreversible damage to cylinders, head gaskets and crankcase, as well as loss of power and failure of critical internal components.

When to replace this part?

The impeller presents characteristic symptoms of wear such as a visible decrease in the cooling water flow (weaker output line), overheating of the engine even when sailing at low speed, or damaged, fractured or deformed blades. It is recommended that the impeller be inspected and replaced every 300-400 hours of operation or annually before the boating season, especially if it has been operated in water with sediment or algae. Preventive replacement is the best guarantee to avoid costly engine repairs; A failed impeller can compromise the entire reliability of the boat in the middle of the trip.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers