Yamaha - Water Pump Housing - Cooling System Component - 6L5-44311-00-00

Overview

On these smaller two-stroke Yamahas, the cooling system is simple, but everything has to be in good shape for it to work right. I’ve seen plenty of weak water flow issues come down to a worn or scored housing, even with a new impeller installed. This is the piece that keeps the pump sealed and working efficiently. If you’re already in there servicing the pump, it’s one of those parts worth replacing to avoid doing the job twice.

Key Features

• Maintains Pump Integrity – Provides proper housing for consistent water pump operation.
• Smooth Internal Surface – Ensures efficient impeller rotation and steady water flow.
• Corrosion-Resistant Construction – Built to handle constant exposure to water and marine conditions.
• Factory-Spec Fitment – Designed to match Yamaha cooling system components for proper alignment.
• Supports Reliable Cooling – Helps maintain consistent engine temperature during operation.

Engine & Boat Compatibility

Designed for Yamaha two-stroke outboard engines, including small horsepower models. Commonly used on portable outboards found on tenders, skiffs, and lightweight utility boats. Always confirm part number compatibility before installation.

FAQ

Q: How do I know if the housing needs replacing?
A: If you see grooves, scoring, or uneven wear inside the housing, it’s time to replace it.

Q: Will a worn housing affect water flow?
A: Yes, it can reduce pump efficiency and lead to weak or inconsistent cooling.

Q: Should I replace this with every impeller change?
A: Not always, but it should be inspected closely and replaced if there’s visible wear.

Q: Can this cause overheating issues?
A: Yes, poor water circulation from a worn housing can lead to higher engine temperatures.

Q: Is installation difficult?
A: It’s straightforward if you’re already servicing the water pump, just make sure everything is aligned properly.