Water Pump Impeller Repair Kit – Fits Yamaha 9.9HP/15HP Outboards (Replaces 63V-W0078-00-00, 63V-W0078-01-00)

Water Pump Impeller Repair Kit – Fits Yamaha 9.9HP/15HP Outboards

This water pump impeller repair kit is designed for Yamaha 9.9HP and 15HP outboard motors, covering 2-Stroke models from 1996–2000 and 4-Stroke models from 1998–2009. It provides a reliable solution for maintaining your engine's cooling system.

Engineered to meet OEM specifications, this kit serves as a direct replacement for Yamaha part numbers 63V-W0078-00-00, 63V-W0078-01-00, 63V-W0078-02-00, 63V-W0078-03-00, and 63V-W0078-04-00.

• Complete Kit: Includes the impeller, housing, plate, seals, and all necessary hardware for a full replacement.
• Installation Method: Designed for direct replacement of the original factory unit.
• Aftermarket Warranty: Comes with a 1-year warranty against manufacturing defects.

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 Insert, Cartridge (63V-44322-00-00)
• 1 x Outer Plate, Cartridge (63V-44323-00-00)
• 1 x Impeller (63V-44352-01-00)
• 1 x Water Seal 2 (647-44366-00-00)
• 1 x Key, Woodruff (664-44338-00-00)
• 4 x Bolt, Hexagon (97080-08045-00)
• 1 x O-Ring (93210-44704)

Explosion Diagram

Installation Guide

1. Disconnect the battery and remove the engine cover.
2. Locate and unbolt the lower unit from the upper casing.
3. Carefully separate the lower unit, disconnecting the shift linkage if necessary.
4. Remove the bolts securing the water pump housing.
5. Slide the old housing and impeller assembly off the driveshaft. Note the rotational direction of the old impeller vanes.
6. Clean the base plate and driveshaft area, removing any old gasket material or debris.
7. Install the new Woodruff key into the driveshaft slot.
8. Slide the new impeller onto the shaft, ensuring the vanes are oriented in the same direction as the old one.
9. Place the new cartridge insert and outer plate over the impeller.
10. Install the new O-rings and seals as provided in the kit.
11. Secure the new water pump housing with the provided bolts, tightening them to the manufacturer-specified torque.
12. Reassemble the lower unit, reattach the shift linkage, and test the engine in water to verify proper water circulation from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This kit is designed for Yamaha 9.9HP and 15HP outboards (2-Stroke 1996–2000 and 4-Stroke 1998–2009). Please verify your specific model and year against the detailed "Compatible Engine Models" table. You can also cross-reference your existing part number with our list to ensure a match.

What are the signs of a failing water pump impeller?
Common signs include the engine overheating, a weak or non-existent water stream from the "tell-tale" outlet, and visible cracks or stiffness in the old impeller's rubber vanes upon inspection.

How often should I replace my water pump impeller?
For optimal engine protection, 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.