Yamaha - Water Pump Repair Kit - Cooling System Service - 6H3-W0078-1A-00

Overview

If you run your motor regularly, the water pump is one of those things you stay ahead of, not react to. I’ve seen too many overheating issues that could’ve been avoided with a simple rebuild like this. When the pump starts losing efficiency, it doesn’t take long for temps to climb. This kit gives you everything you need to bring the cooling system back to where it should be.

Key Features

• Complete Pump Service Kit – Includes the essential components needed to restore water pump performance.
• Reliable Cooling Flow – Helps maintain steady water circulation to protect against overheating.
• OEM Fitment Components – Built to Yamaha specifications for proper alignment and sealing.
• Durable Internal Parts – Designed to handle continuous operation in harsh marine environments.
• Preventative Maintenance Solution – Ideal for routine service intervals to avoid unexpected failures.

Engine & Boat Compatibility

Designed for Yamaha outboards with compatible water pump and cooling system assemblies. Commonly used across small to mid-size engines found on fishing boats, skiffs, and recreational vessels. Always verify compatibility with your specific engine before installation.

FAQ

Q: What are signs my water pump needs rebuilding?
A: Weak telltale flow, rising engine temperatures, or overheating alarms are common signs.

Q: How often should I use a repair kit like this?
A: Most boaters service the pump every 1–2 seasons, especially in saltwater use.

Q: Is this something I can install myself?
A: Yes, if you’re comfortable removing the lower unit and following proper steps.

Q: Does sand or debris affect the water pump?
A: Definitely. Running in shallow or dirty water can wear components faster.

Q: Should I replace the whole kit or just the impeller?
A: It’s best to replace the full kit to ensure all wear parts are refreshed together.