SUZUKI IMPELLER COVER 17471-97J00

Function and technical context

This impeller cover is part of the outboard motor's water cooling system, acting as a cover for the chamber where the water pump impeller works. Its function is to seal and contain the flow of water that the impeller drives towards the engine cooling circuit, guaranteeing the pressure and flow rate necessary to maintain the working temperature within safe limits. Without a cover in good condition, the pump loses efficiency, the cooling flow is compromised and the motor is exposed to the risk of overheating. In compact, low-displacement engines such as the DF2.5, where the pump components work under constant stress in saline and corrosive environments, the integrity of this part is decisive for the reliability of the assembly.

When to replace this part?

The most common signs of deterioration in the impeller cover include wear marks or erosion on the inner contact surface, microcracks caused by galvanic corrosion or repeated thermal cycling, and cooling flow losses detectable by weak or irregular exhaust water jet. It is recommended to inspect this part every time impeller maintenance is performed, an operation that on outboard engines is usually carried out every 300-400 hours of navigation or every two seasons. Replacing it preventively along with the impeller and the seat prevents breakdowns due to overheating in navigation situations far from the port.