Yamaha - Impeller Key (Tee Key) - Water Pump Component - 63D-JD017-05-00

Overview

The impeller key is a small but critical piece inside the water pump that locks the impeller to the driveshaft. Without it, the impeller won’t spin properly, and that means no water flow through the engine. When this key wears, shears, or goes missing, cooling performance drops off fast and can lead to overheating. This Yamaha impeller tee key is built to keep the impeller turning as it should and maintain steady water circulation through the system.

Key Features

• Impeller Drive Connection – Locks the impeller to the shaft for proper rotation.

• Maintains Water Flow – Ensures consistent cooling system performance.

• OEM Yamaha Fitment – Built to factory specifications for precise fit and function.

• Compact High-Strength Design – Designed to handle rotational force and long-term use.

Engine & Boat Compatibility

• Compatible with select Yamaha outboards that utilize this impeller key (confirm fitment by model and year)

FAQ

Q: What happens if the impeller key fails?
A: The impeller won’t spin correctly, which can lead to overheating.

Q: Is this included in water pump kits?
A: Sometimes, but not always—it's important to check before service.

Q: Should I replace this during impeller service?
A: Yes, especially if there’s any sign of wear or damage.

Q: Can a missing key damage the engine?
A: Yes, it can stop water flow and quickly cause overheating issues.