Yamaha - Outer Plate Cartridge - Water Pump Housing Component - 6H3-44323-40-00

Overview

When you’re rebuilding a water pump, the small housing components matter just as much as the impeller. I’ve seen pumps lose efficiency simply because the wear plates were scored or warped. This outer plate helps keep everything sealed and moving water the way it should. It’s one of those parts you replace while you’re in there to avoid doing the job twice.

Key Features

• Water Pump Housing Support – Forms part of the pump assembly that directs water flow through the system.
• Smooth Internal Surface – Helps maintain efficient impeller operation and consistent water movement.
• OEM-Spec Fitment – Built to Yamaha dimensions for proper alignment within the pump housing.
• Wear-Resistant Design – Designed to handle constant contact and reduce internal scoring over time.
• Cooling System Efficiency – Supports proper water circulation to help prevent overheating.

Engine & Boat Compatibility

Designed for Yamaha outboards with compatible water pump and cooling system assemblies. Commonly used across small to mid-size engines found on fishing boats, skiffs, and recreational vessels. Always confirm compatibility with your specific engine before installation.

FAQ

Q: What happens if this plate is worn or damaged?
A: It can reduce water pump efficiency, leading to weak water flow and potential overheating.

Q: Should I replace this during impeller service?
A: Yes, especially if there are visible grooves or wear—it helps ensure the pump works properly.

Q: Can this part cause overheating on its own?
A: Indirectly, yes—if it’s worn, it can reduce water flow enough to impact cooling.

Q: Is installation complicated?
A: Not usually, but it needs to be seated correctly within the pump housing.

Q: Does debris in the water affect this part?
A: Over time, sand and debris can cause wear, which is why inspection during service is important.