This impeller is a precision-fit water pump component designed for Yamaha 5C series outboard engines, helping ensure effective cooling water flow through the engine's cooling system. It is sized at 52 mm overall diameter × 12.86 mm vane depth × 13.86 mm hub height and engineered to match the water pump requirements for select Yamaha models with those dimensions. This impeller draws water from the body of water you're navigating and forces it through the engine's heat exchanger or jackets, helping prevent overheating and maintain stable engine temperatures during operation. Over time, impeller vanes can wear, harden, crack, or lose flexibility due to heat, vibration, debris ingestion, and regular use, which reduces cooling efficiency and can lead to overheating or engine damage if left unaddressed. Replacing the impeller at recommended service intervals helps restore proper water flow, protect internal engine components, and maintain dependable performance on the water. This compatible impeller fits Yamaha 5C (2002), 5CM (2005), and 5CMH (2004) outboard engines and may also be suitable for Sierra part 18-3063, offering flexibility across applications. Proper installation in the water pump housing with correct orientation and lubrication ensures the vanes remain flexible and perform as intended. Paying attention to impeller condition and replacing it when wear is evident is an important part of marine engine maintenance that helps support long-term engine reliability.
For Yamaha:
5C (2002)
5CM (2005)
5CMH (2004)
Interchangeable with Sierra 18-3063
Compatible with Yamaha 5C series outboards: Designed specifically to fit the water pump housing of Yamaha 5C (2002), 5CM (2005), and 5CMH (2004) outboard engines, this impeller offers correct dimensions and vane engagement for reliable performance. Accurate compatibility ensures the part seats properly inside the pump housing and delivers consistent water flow when installed according to service guidelines, helping maintain normal cooling system operation.
Restores effective cooling water flow: The impeller's flexible vanes draw water from outside the hull and push it through the engine's internal cooling passages, helping prevent overheating and maintain stable operating temperatures. Adequate cooling is essential for protecting pistons, cylinder walls, and exhaust components from heat-related wear or damage, particularly in high-load or extended operation scenarios.
Manufactured for marine environment durability: Impellers in marine water pumps must withstand constant exposure to water, heat, debris, and vibration, and this compatible unit is constructed from materials that balance flexibility with strength. Durable vanes resist cracking and deformation, helping ensure continuous performance even in demanding boating environments where saltwater or foreign matter can stress pump components.
Helps prevent heat-related engine damage: Worn impeller vanes can significantly reduce cooling water output, increasing the risk of elevated engine temperatures that can cause serious damage to internal components. Regular replacement before the vanes harden or deform helps maintain pump efficiency, reducing the likelihood of overheating issues that can lead to costly repairs or engine failure while underway.
May also be suitable for Sierra 18-3063: In addition to Yamaha models, this impeller's dimensions and design may make it compatible with Sierra part number 18-3063, offering a potential alternative for owners or technicians who maintain multiple engine brands or prefer a specific aftermarket part reference. Cross-reference compatibility can simplify inventory or maintenance planning for fleet operators or marine service professionals.
Straightforward installation when servicing the water pump: When the water pump is accessed for maintenance, this impeller can be installed in place of the old unit with standard tools and procedures. Proper installation includes orienting the vanes correctly and lubricating them lightly before assembly, helping ensure flexibility and full vane contact during initial pump operation after service. Following the engine manufacturer's service manual ensures proper sequence and torque for reliable operation.
Supports long-term engine performance and cooling reliability: Maintaining a healthy impeller and cooling system contributes to stable temperatures, improved component longevity, and fewer heat-related performance issues over the life of the engine. A well-functioning cooling pump system helps sustain fuel efficiency and power delivery while protecting critical engine internals, making impeller condition an important factor in overall boating reliability and enjoyment.
Replacing the impeller on your Yamaha 5C series outboard is an essential part of routine marine engine maintenance that supports effective water cooling, helps prevent overheating, and protects vital internal components from heat-induced wear. With proper fitment at 52 × 12.86 × 13.86 mm, this compatible impeller matches the pump requirements for Yamaha 5C (2002), 5CM (2005), and 5CMH (2004) engines and may also suit Sierra reference 18-3063. Installing a flexible, undamaged impeller helps maintain steady water flow, consistent engine temperatures, and reliable performance over time. Regular inspection and timely replacement contribute to smoother operation, better fuel efficiency, and greater confidence while navigating, whether cruising, fishing, or enjoying recreational use. Long-term attention to the cooling system's components is a key part of protecting your outboard and reducing costly downtime.
Please refer to the image to ensure suitability.
What's in the box
1 x Impeller
