Yamaha - Water Pump Impeller - Cooling System Component - 6H4-44352-02-00

Overview

The impeller is one of those parts I tell people not to push their luck with. I’ve seen engines run fine one day and overheat the next just because an old impeller finally gave out. It’s the heart of your cooling system, constantly moving water every time the motor is running. Staying ahead of it with a fresh one is just part of owning a Yamaha and keeping it reliable.

Key Features

• Primary Water Pump Driver – Circulates cooling water through the engine to regulate temperature.
• Flexible Blade Design – Allows consistent water flow even at varying engine speeds.
• OEM-Spec Fitment – Built to Yamaha standards for proper fit and pump housing alignment.
• Heat-Resistant Material – Designed to handle constant rotation and exposure to engine heat.
• Preventative Maintenance Essential – Helps avoid overheating and costly engine damage.

Engine & Boat Compatibility

Designed for Yamaha outboards with compatible water pump systems. Commonly used across a range of 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 a worn impeller is failing?
A: Weak or no telltale stream, overheating alarms, or rising engine temperature are common signs.

Q: How often should I replace my impeller?
A: Most boaters replace it every 1–2 seasons, especially with regular use or saltwater operation.

Q: Can I run the engine with a bad impeller?
A: It’s risky—without proper water flow, the engine can overheat quickly.

Q: Does sitting unused damage the impeller?
A: Yes, the blades can stiffen or take a set over time, reducing performance.

Q: Should I replace other parts at the same time?
A: It’s a good idea to inspect or replace the full water pump kit while you’re in there.

• Supersessions
  6H4-44352-01-00, 6H4-44352-00-00