Water Pump Impeller Kit – Fits Yamaha 4HP, 5HP, 6HP Four-Stroke Outboards (Replaces 6BX-WG078-00, 6EE-W0078-00, 6EE-W0078-01)

Water Pump Impeller Kit – Fits Yamaha 4HP, 5HP, 6HP Four-Stroke Outboards (Replaces 6BX-WG078-00, 6EE-W0078-00, 6EE-W0078-01)

This water pump impeller repair kit is designed for Yamaha 4-stroke outboard engines, including 4HP, 5HP, and 6HP F4B, F5A, and F6C models from 2009–2023.

It serves as a direct replacement for Yamaha part numbers 6BX-WG078-00, 6BX-WG0078-00, 6EE-W0078-00, 6EE-W0078-01, and Sierra 18-3473, ensuring compatibility and reliable performance.

• Includes all essential components for a complete water pump overhaul: impeller, housing, gaskets, and hardware.
• Engineered for a direct OEM replacement fit, simplifying installation.
• Designed for use with gasoline-fueled outboard engines.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Impeller (6E0-44352-00)
• 1 x Housing, Water Pump (6EE-G4311-00)
• 1 x Gasket, Water Pump (6EE-G4315-00)
• 1 x Cup, Insert (6EE-G4322-00)
• 1 x Plate, Wear (6EE-G4323-00)
• 1 x Damper, Water Seal (6EE-G4366-00)
• 2 x Pin, Dowel (93604-18080)
• 4 x Bolt (97080-06045)

Installation Guide

1. Disconnect Power: Disconnect the battery and spark plug wire(s) for safety.
2. Drain Gearcase Oil: Drain the lower unit gearcase oil into a suitable container.
3. Remove Lower Unit: Unbolt and carefully detach the lower unit (gearcase) from the engine's midsection.
4. Access Water Pump: Remove the bolts securing the water pump housing to access the impeller and other components.
5. Replace Components: Remove the old impeller, gaskets, wear plate, and insert cup. Clean all surfaces thoroughly.
6. Install New Parts: Install the new components from the kit in the reverse order of removal. Lightly grease the new impeller.
7. Reassemble: Reattach the water pump housing and torque bolts to the manufacturer's specification.
8. Reattach Lower Unit: Reinstall the lower unit, ensuring the driveshaft and water tube are correctly aligned.
9. Refill Oil & Test: Refill the gearcase with fresh oil. Reconnect the battery and start the engine on a water supply to verify proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
First, check your engine's model and year against the "Compatible Engine Models" table. Second, verify your existing part numbers match those in the "Part Number Cross-Reference" list. If you are unsure, use the linked Yamaha guides to find your serial number and check original part diagrams.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating, an intermittent or weak water stream from the "tell-tale" outlet, or a visible crack or damage on the impeller vanes during inspection.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater).

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.