Yamaha - Water Pump Gasket - Cooling System Seal - 6H3-44315-A0-00

Overview

Water pump issues don’t always come from the impeller—sometimes it’s a simple gasket that’s not sealing right. I’ve seen small leaks or air gaps throw off cooling performance more than people expect. When this gasket wears out, you can lose pressure in the system and start running hotter than normal. It’s a small part, but it plays a big role in keeping the cooling system tight and working properly.

Key Features

• Seals Water Pump Housing – Prevents leaks and maintains proper cooling system pressure.
• Precision Fit Design – Matches Yamaha specifications for accurate alignment and sealing.
• Heat-Resistant Material – Built to withstand constant exposure to temperature changes.
• Supports Efficient Cooling – Helps ensure consistent water flow through the engine.
• Ideal for Service Replacement – Commonly replaced during water pump maintenance.

Engine & Boat Compatibility

Designed for Yamaha outboard engines with compatible water pump and cooling systems. Commonly used across small to mid-range outboards on fishing boats, skiffs, and utility vessels. Always confirm part number compatibility before installation.

FAQ

Q: What are signs this gasket is failing?
A: Water leaks, reduced cooling performance, or overheating can indicate a bad seal.

Q: Should I replace this during an impeller change?
A: Yes, it’s best practice to replace gaskets whenever the pump is serviced.

Q: Can a bad gasket cause overheating?
A: Yes, it can reduce system pressure and affect water circulation.

Q: Is installation difficult?
A: It’s straightforward, just make sure surfaces are clean and properly aligned.

Q: Does saltwater affect this gasket?
A: Over time it can, which is why regular inspection and replacement is important.

• Supersessions
  6H3-44315-00-00