Water Pump Impeller SIERRA 118-3104-1

Compatible Engines

The SIERRA 118-3104-1 water pump impeller is a critical component of the cooling system, specifically engineered for JOHNSON and EVINRUDE outboard motors. This part is designed for units with power outputs of 40 HP, 48 HP, and 50 HP, manufactured between 1989 and 1994. With precise dimensions of 91.3x25.5x19 mm, it ensures a perfect fit and efficient water pumping, which is essential for maintaining stable engine operating temperatures.

Important Compatibility Note: Due to limited specific model data in official catalogs, we recommend verifying part compatibility. The safest approach is to compare the manufacturer catalog number 118-3104-1 with the OE (original) number in your owner's manual. If you have any doubts about selecting the correct impeller, please contact our customer support team—we are happy to assist you in choosing the right part.

Installation and Maintenance

• SIERRA Original Quality – guarantees durability and corrosion resistance in harsh marine environments.
• Safe Operation – prevents engine overheating, protecting expensive components from damage.
• Easy Installation – impeller replacement is a standard service that can be performed in workshop conditions.
• Optimal Performance – regular impeller replacement ensures a steady flow of cooling water.

Regular replacement of the water pump impeller is an investment in your engine's longevity. A failed impeller can lead to breakdowns, where repairs are significantly more expensive than replacing this affordable part. Always check the impeller condition during seasonal inspections.