Disconnect the lower unit and remove the water pump housing to access the impeller.

Replace the worn impeller with a new one, ensuring the vanes are oriented correctly.

Reassemble the pump housing and lower unit, then test for proper water flow.

Impeller Size: Typically 30mm to 60mm diameter depending on Yamaha outboard model.

Grade: Nitrile rubber (NBR) or neoprene for durability and chemical resistance.

Viscosity: Not applicable (impeller is a solid component).

Buoyancy: Neutral to slightly negative (non-floating material).

Material: Flexible rubber with reinforced vanes for water propulsion.

Hub Material: Stainless steel or brass for corrosion resistance.

Operating Temperature Range: -20°C to 90°C (-4°F to 194°F).

Compatibility: Matches OEM specifications for Yamaha marine pumps.

Installation Torque: 7-10 Nm (for securing impeller housing).

Lubrication: Requires marine-grade grease during installation.

Replacement Interval: Every 1-2 years or 300-500 engine hours.