Yamaha - Water Pump Repair Kit - Cooling System Service Kit - 6E5-W0078-1A-00

Overview

On these Yamahas, the water pump is one of the first things I check if there’s any question about engine temp. I’ve seen good motors get cooked just because the pump wasn’t serviced in time. This kit is what you use to bring the cooling system back to life without cutting corners. Once it’s done right, you get solid water flow and peace of mind every time you fire it up.

Key Features

• Complete Water Pump Service Kit – Includes essential components to rebuild and restore pump function.
• Restores Cooling Performance – Helps maintain proper engine temperature under load.
• Durable Marine-Grade Materials – Built to handle heat, debris, and continuous water exposure.
• Consistent Water Flow Output – Supports steady cooling system operation across conditions.
• Exact Yamaha Fitment – Matches factory specifications for proper installation and reliability.

Engine & Boat Compatibility

Designed for Yamaha outboard engines utilizing water pump systems that require periodic service or rebuild. Commonly used across a wide range of Yamaha outboards in recreational and commercial marine applications. Suitable for freshwater and saltwater environments where dependable cooling performance is critical.

FAQ

Q: What are signs the water pump needs rebuilding?
A: Weak telltale stream, overheating, or inconsistent cooling are common signs.

Q: How often should I replace the water pump components?
A: Typically once a year or every 100 hours, depending on usage and conditions.

Q: Any tips for installing this repair kit?
A: Make sure the impeller is installed in the correct direction and lubricated during assembly.

Q: Why use a full repair kit instead of just replacing the impeller?
A: Replacing all components ensures proper sealing and longer-lasting performance.

Q: How does running in shallow or dirty water affect the pump?
A: It can wear components faster and reduce efficiency, making regular maintenance even more important.