Water Pump Impeller Kit – Fits Yamaha 9.9/13.5/15/20HP 4-Stroke Outboards (Replaces 6AH-W0078-00)

Water Pump Impeller Kit – Fits Yamaha 9.9/13.5/15/20HP 4-Stroke Outboards

This water pump impeller repair kit provides a complete solution for servicing Yamaha 4-stroke outboards, including models F9.9, F13.5, F15C, and F20 (9.9HP, 13.5HP, 15HP, 20HP) from 2006 to 2023. It is designed to meet or exceed OEM specifications for reliable performance.

This kit directly replaces Yamaha OEM part numbers: 6AH-W0078-00-00, 6AH-W0078-01-00, and 6AH-W0078-02-00.

• Engineered for direct OEM replacement to ensure a precise fit and easy installation.
• Features a durable cast iron housing for enhanced longevity and corrosion resistance.
• Includes all necessary components for a comprehensive water pump service, including the impeller, housing, plates, and gaskets.

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 Water Pump Housing (6AH-44311-00-00)
• 1 x Cartridge Insert (63V-44322-00-00)
• 1 x Water Seal Damper (6L2-44367-00-00 / 6L2-44367-01-00)
• 1 x Impeller (63V-44352-01-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x O-Ring (93210-49046-00)
• 1 x Cartridge Outer Plate (68T-44323-00-00)
• 2 x Dowel Pins (93604-10M03-00)
• 4 x Bolts (97095-08045-00)
• 2 x Plates (63V-44328-01-00)

Installation Guide

1. Disconnect Power: Disconnect the battery and spark plug wires for safety.
2. Access the Lower Unit: Drain the gearcase oil. Remove the bolts securing the lower unit to the engine and carefully lower it.
3. Remove Old Pump: Unbolt and remove the old water pump housing assembly from the driveshaft.
4. Clean Surfaces: Thoroughly clean the mounting surfaces, removing any old gasket material or debris.
5. Install New Components: Slide the new Woodruff key and impeller onto the driveshaft. Install the new plates, o-ring, and cartridge insert into the housing.
6. Mount New Pump: Place the new housing assembly over the impeller, ensuring the impeller fins are correctly oriented (typically clockwise). Secure it with the new bolts.
7. Reassemble: Re-install the lower unit, reconnect all linkages, and refill the gearcase with fresh oil.
8. Test Operation: Reconnect the battery and test the engine using a water source (flushing muffs) to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific engine model?

A: The most reliable method is to check your engine's model and year against the compatibility chart above. We also recommend using the official Yamaha guides linked above to verify your serial number and review parts diagrams to ensure all components match.

Q: What are the common signs of a failing water pump or impeller?

A: Key symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" indicator, or a brittle or cracked appearance on the old impeller's vanes upon inspection.

Q: How often should I replace my water pump impeller?

A: For preventative maintenance, it is recommended to inspect and/or replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.

Q: What is the difference between this part and an OEM component?

A: 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.

Q: How fast do you ship and how much does it cost?

A: 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.

Q: What is your warranty and return policy?

A: 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.