Water Pump Impeller & Key – Fits Yamaha 425HP 450HP (Replaces 6GR-44352-00, 6AW-44336-00-0)

Product Details

This Water Pump Impeller & Key is designed for Yamaha 425HP and 450HP outboard motors. Engineered as a direct-fit aftermarket replacement, this impeller ensures reliable water circulation to keep your high-performance XF series engine running cool under demanding conditions.

This component directly replaces Yamaha OEM part numbers 6GR-44352-00-00 and 6GR-44352-00, offering full interchange compatibility for your service needs.

• Complete kit includes impeller and drive key for immediate installation
• Designed for high-output Yamaha XF 425 HP and XF 450 HP engines
• Precision-molded rubber construction for consistent water flow and durability

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

OEM Reference

6GR-44352

Application

Outboard water pump impeller replacement

Compatible Engines

Yamaha XF 425 HP, Yamaha XF 450 HP

Kit Contents

Impeller with drive key/pin

What's in the Box

• Outboard rubber impeller with key/pin

Installation Notes

1. Disconnect the battery and ensure the engine is off and cool before beginning work.
2. Remove the lower unit according to your engine's service manual.
3. Access the water pump housing and remove the cover plate.
4. Extract the old impeller, noting the orientation of the blades.
5. Inspect the pump housing and plate for scoring, corrosion, or debris; clean or replace as needed.
6. Lubricate the new impeller with glycerin or soapy water—never petroleum-based lubricants.
7. Insert the drive key into the driveshaft slot.
8. Install the new impeller onto the driveshaft, rotating blades in the correct direction.
9. Reassemble the pump housing, ensuring all O-rings and gaskets are properly seated.
10. Reinstall the lower unit, torque all fasteners to specification, and reconnect the battery.
11. Run a water test to confirm proper cooling system operation and check for leaks.

Troubleshooting & FAQ

How do I know when to replace my impeller?

Replace your impeller annually or every 200–300 operating hours, whichever comes first. Signs of failure include engine overheating, weak water stream from the tell-tale, or visible cracking and missing blades during inspection.

Will this impeller fit both the 425 HP and 450 HP models?

Yes, this impeller is designed to fit both Yamaha XF 425 HP and XF 450 HP outboard engines using OEM part number 6GR-44352-00-00.

Do I need to replace the drive key every time I change the impeller?

It is highly recommended. The drive key can wear or deform over time, and replacing it ensures reliable torque transfer and prevents slippage that could damage the new impeller.

What type of lubricant should I use during installation?

Use only glycerin, dishwashing liquid, or a water-based lubricant. Never use petroleum-based products, as they can swell and degrade the rubber impeller material.

Can I install this myself, or do I need a professional?

If you have mechanical experience and the proper tools, installation is straightforward following your engine's service manual. For those unfamiliar with lower unit service, professional installation is recommended to ensure correct assembly and torque specifications.

What causes impeller failure?

Common causes include running the engine dry, debris in the cooling system, prolonged idle time causing blade set, chemical degradation, and normal wear from continuous flexing during operation.

Safety & Important Info

• Verify images/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.