Yamaha - Cartridge Outer Plate - Cooling System Component - 6L5-44323-00-00

Overview

When you’re rebuilding a water pump, it’s not just about the impeller—the surrounding parts matter just as much. I’ve seen plenty of pumps underperform because the plate was worn or uneven. This outer plate helps keep everything aligned and sealed so the pump can actually do its job. It’s a small piece, but without it in good shape, you won’t get proper water flow.

Key Features

• Supports Pump Structure – Helps maintain proper alignment of internal water pump components.
• Smooth Contact Surface – Provides a consistent surface for efficient impeller operation.
• Corrosion-Resistant Build – Designed to withstand constant exposure to water and marine conditions.
• Factory-Spec Fitment – Matches Yamaha cooling system components for proper installation.
• Ideal for Pump Rebuilds – Commonly replaced during full water pump service.

Engine & Boat Compatibility

Designed for Yamaha outboard engines with compatible water pump systems. Commonly used across small to mid-range outboards on fishing boats, skiffs, and utility vessels. Always confirm part number compatibility before installation.

FAQ

Q: What happens if this outer plate is worn?
A: It can reduce pump efficiency, leading to weaker water flow and potential cooling issues.

Q: Should I replace this with the impeller?
A: It’s a good idea to inspect it every time and replace it if there’s any scoring or wear.

Q: Can this cause overheating problems?
A: Yes, if the pump can’t move water efficiently, the engine may run hotter than normal.

Q: Is installation difficult?
A: Not usually—it fits into the pump assembly, just make sure it’s seated properly.

Q: Does saltwater use wear this part faster?
A: Over time, yes—regular inspection helps catch wear before it affects performance.