Yamaha - Water Pump Cartridge Outer Plate - Cooling System Component - 61N-44323-40-00

Overview

The outer plate is a critical component inside the water pump assembly, providing the surface the impeller rotates against. Over time, this surface can wear down, reducing water pressure and overall cooling performance. This Yamaha outer plate is designed to restore a smooth contact surface, helping maintain consistent water flow and proper engine cooling. Replacing it during water pump service helps prevent overheating and keeps your outboard running reliably.

Key Features

• Impeller Contact Surface – Provides a smooth surface for efficient impeller rotation.
• Maintains Cooling Efficiency – Helps ensure consistent water flow through the engine.
• OEM Yamaha Fitment – Built to factory specifications for proper alignment and installation.
• Wear-Resistant Design – Designed to handle continuous water flow and internal friction.

Engine & Boat Compatibility

• Compatible with select Yamaha outboards that utilize this outer plate (confirm fitment by model and year)

FAQ

Q: What happens if the outer plate is worn?
A: It can reduce water pressure and lead to overheating, especially at low speeds.

Q: Should I replace this during a water pump rebuild?
A: Yes, especially if there are grooves or visible wear.

Q: Can I reuse the old plate?
A: It’s possible, but even minor wear can reduce cooling efficiency.

Q: Does this affect impeller lifespan?
A: Yes, a worn plate can shorten impeller life and reduce performance.