Yamaha - Water Pump Cartridge Insert - Cooling System Component - 688-44322-00-00

Overview

When you’re servicing a water pump, the insert is one of those pieces you don’t want to overlook. It’s what the impeller rides against, and if it’s worn or grooved, you’re not getting the water flow you should. I’ve seen engines still run hot even after a new impeller because the insert was shot. Replacing it keeps your cooling system tight and doing its job every time you fire up.

Key Features

• Impeller Contact Surface – Provides the internal surface needed for proper impeller operation and water movement.
• Genuine Yamaha Fitment – Built to match factory pump housing specifications for correct alignment.
• Supports Strong Water Flow – Helps maintain consistent cooling performance across all engine speeds.
• Wear-Resistant Construction – Designed to handle constant friction from impeller rotation.
• Essential Rebuild Component – Ideal for full water pump service and long-term reliability.

Engine & Boat Compatibility

Compatible with select Yamaha outboards using this water pump cartridge insert. Verify fitment based on your specific engine model.

FAQ

Q: What are signs this insert is worn out?
A: Weak telltale stream, overheating, or visible scoring inside the pump housing.

Q: Should I replace this with every impeller change?
A: Not always, but if there’s any wear, it’s best to replace it.

Q: Can a worn insert cause overheating?
A: Yes, it can reduce water flow and lead to higher engine temps.

Q: Is installation difficult?
A: It’s straightforward as part of a standard water pump rebuild.

Q: Does debris affect this part?
A: Yes, sand and debris can accelerate wear on the insert surface.