The outboard engine water pump circulates water to cool the engine and prevent overheating. Marine pumps are essential for maintaining proper engine temperature and performance. They typically feature an impeller that draws water from the surrounding environment.

Size: Typically ranges from 1.5 to 4 inches in diameter for impeller housing.

Grade: Marine-grade materials, often compliant with ASTM or ISO standards.

Viscosity: Suitable for fluids with viscosities up to 1000 cSt (centistokes).

Buoyancy: Not applicable, as pumps are fixed to the engine or hull.

Material: Impeller—nitrile rubber or neoprene; housing—stainless steel, aluminum, or reinforced plastic.

Flow Rate: 5 to 50 gallons per minute (GPM), depending on engine size.

Pressure Rating: 10 to 60 PSI, varying by pump type and application.

Temperature Range: -20°F to 200°F (-29°C to 93°C) for standard models.

Seal Type: Mechanical seals or lip seals, often corrosion-resistant.

Mounting: Bolt-on or clamp-on, compatible with standard marine engine configurations.