Yamaha - Water Pump Repair Kit - Cooling System - 6E0-W0078-A4-00

Overview

When you’re servicing a Yamaha water pump, it’s usually not just the impeller that needs attention. I’ve opened up plenty of lower units where the whole pump was worn, not just one piece. A full repair kit like this lets you go through everything at once and know it’s done right. It saves time, prevents repeat issues, and keeps your cooling system strong every time you hit the water.

Key Features

• Complete Pump Rebuild Kit – Includes essential components needed for a full water pump service.
• Restores Cooling Efficiency – Helps bring water flow and pressure back to proper levels.
• Matched Internal Components – Designed to work together for consistent fit and reliable operation.
• Durable Marine Materials – Built to handle heat, friction, and debris in real-world conditions.

Engine & Boat Compatibility

Designed for Yamaha 2-stroke outboard engines using standard water pump systems. Commonly used on smaller horsepower motors found on skiffs, jon boats, and lightweight fishing setups.

FAQ

Q: When should I use a full repair kit instead of just replacing the impeller?
A: If there’s visible wear or you want to avoid repeat repairs, it’s best to replace everything at once.

Q: What are signs the water pump needs servicing?
A: Weak telltale flow, overheating, or inconsistent water pressure are common indicators.

Q: What does it mean this part is superseded?
A: It means Yamaha has released an updated version that replaces this kit.

Q: Is installation difficult?
A: It’s manageable if you’re comfortable removing the lower unit and following a service guide.

Q: Does running in shallow or sandy water affect the pump?
A: Yes, debris can wear down internal components much faster.

• Supersessions
  6E0-W0078-A3-00, 6E0-W0078-A5-00, 6E0-W0078-A5-00