Replacing the water pump on a Yamaha 150 outboard involves removing the lower unit to access the pump housing.

The old impeller and housing components are then replaced with new parts to ensure proper cooling system function.

Reassembly and testing verify the pump is working correctly to prevent engine overheating.

Size: Typically 2.5 to 3 inches in diameter

Grade: Marine-grade components

Viscosity: Compatible with 10W-30 or 25W-40 marine engine oil

Buoyancy: N/A (non-floating component)

Material: Stainless steel, brass, or composite housing with rubber impeller

Impeller Material: Nitrile rubber (NBR) or neoprene

Pressure Rating: 15-30 PSI (varies by model)

Flow Rate: Approximately 20-30 gallons per hour

Compatibility: Designed for Yamaha 150 HP outboard engines

Seal Type: Mechanical or lip seal for watertight operation

Mounting: Bolt-on or press-fit depending on model

Operating Temperature: -20°F to 200°F (-29°C to 93°C)

Corrosion Resistance: Saltwater-resistant coatings or materials