To change the impeller on a Yamaha outboard marine pump, first remove the lower unit to access the water pump housing. Carefully extract the old impeller and inspect the housing for wear or damage. Install the new impeller, ensuring proper alignment, and reassemble the pump before testing for proper water flow.

Size: Typically ranges from 2.5 to 6 inches in diameter, depending on the model.

Grade: Marine-grade impellers designed for saltwater and freshwater use.

Viscosity: Compatible with lubricants having a viscosity range of SAE 10W-30 to SAE 25W-40.

Buoyancy: Neutral buoyancy to minimize drag and ensure efficient operation.

Material: Nitrile rubber (NBR) or neoprene for durability and resistance to corrosion and abrasion.

Operating Temperature: -20°F to 180°F (-29°C to 82°C).

Pressure Rating: Designed to handle pressures up to 50 PSI (3.4 bar).

Compatibility: Fits Yamaha outboard marine pumps, including models like F25, F50, F75, and F115.

Installation Torque: 7-10 ft-lbs (9.5-13.5 Nm) for secure mounting.

Lifespan: Approximately 100-300 hours of operation, depending on usage conditions.