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

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

Reassembly and testing verify that water flows correctly to prevent engine overheating.

Size: Varies by model (commonly 1.5" to 3" diameter impeller)

Grade: Marine-grade components

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

Buoyancy: N/A (non-floating component)

Material: Stainless steel housing, nitrile or neoprene impeller

Pressure Rating: 15-30 PSI (varies by engine size)

Flow Rate: 20-60 GPM (depending on engine displacement)

Seal Type: Ceramic or carbon mechanical seal

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

Drive Type: Direct crankshaft gear engagement