Replacing the impeller on an Evinrude outboard marine pump involves removing the lower unit to access the water pump housing. Carefully remove the old impeller and install the new one, ensuring proper alignment and orientation. Reassemble the pump housing and lower unit, then test for proper water circulation to confirm successful replacement.

Size: Varies by model (commonly 3-5 inches in diameter)

Grade: OEM or equivalent marine-grade

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

Buoyancy: Neutral (non-buoyant, designed for submerged operation)

Material: Nitrile rubber, neoprene, or reinforced elastomer

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

Pressure Rating: 10-30 PSI (depending on pump model)

Impeller Type: Flexible vane design (6-12 vanes)

Shaft Compatibility: Stainless steel or corrosion-resistant alloy

Seal Type: Mechanical or lip seal (water-resistant)

Chemical Resistance: Fuel, oil, and water-resistant

Installation Torque: 5-15 ft-lbs (varies by housing)

Replacement Interval: Every 2-3 years or 300-500 hours