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

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

This water pump impeller kit is designed for Yamaha 4-stroke F9.9C (1998-2008) and F15A (1998-2007) outboard motors. It also fits various 2-stroke 9.9/15 HP models (1996-2000) and newer 9.9/15 HP (2004+) engines.

This kit is a direct replacement for Yamaha part numbers 63V-W0078-01-00, 63V-W0078-00-00, 63V-W0078-02-00, 63V-W0078-03-00 and aftermarket part numbers from Sierra and GLM.

• Installation: Direct replacement for a straightforward installation.
• Complete Kit: Includes the impeller, woodruff key, gaskets, and all other necessary components shown.
• Wide Compatibility: Fits a broad range of popular Yamaha 9.9 HP and 15 HP 2-stroke and 4-stroke models.

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.

Yamaha 2-Stroke

Yamaha 4-Stroke

Technical Specifications

Package Contents

• 1 x Impeller (63V-44352-01-00)
• 1 x Woodruff Key (664-44338-00-00)
• 1 x Outer Plate (63V-44323-00)
• 4 x Bolts (97095-08045-00)
• 1 x Cartridge Insert (63V-44322-00)
• 1 x Water Seal Damper (647-44366-00-00)
• 1 x O-ring (93210-44704)

Installation Guide

1. Disconnect the spark plug leads and battery cables for safety.
2. Place a drain pan under the lower unit and remove the gear oil drain screw to empty the oil.
3. Remove the bolts securing the lower unit (gearcase) to the upper casing.
4. Carefully lower and separate the gearcase from the drive shaft housing.
5. Unscrew the bolts on the water pump housing and lift it off.
6. Remove the old impeller, gaskets, wear plate, and any seals. Note their orientation.
7. Clean all mating surfaces thoroughly, removing any old gasket material or debris.
8. Install the new components from the kit in reverse order. Lightly grease the new impeller and housing interior.
9. When installing the new impeller, turn the driveshaft clockwise to help seat the vanes correctly.
10. Reassemble the housing and torque the bolts to the manufacturer's specification.
11. Re-install the lower unit, ensuring the water tube, shift shaft, and driveshaft align correctly.
12. Refill the lower unit with the specified marine gear lubricant before starting the engine.

Troubleshooting & FAQ

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

A: Please review the compatible engine tables on this page for your specific model and year. For further verification, we recommend using the Yamaha Serial Number Guide to identify your engine and cross-referencing the OEM part number (63V-W0078-01) with your service manual or existing parts.

Q: What are the symptoms of a bad water pump impeller?

A: Common signs include the engine overheating, especially at idle or low speeds, and a weak or non-existent stream of water from the "tell-tale" outlet. A visual inspection may also reveal cracked, broken, or worn impeller vanes.

Q: How often should the water pump impeller be replaced?

A: As a preventative maintenance measure, it is best to replace the impeller every one to two years, or every 100-200 hours of operation. Frequent use in saltwater, silty, or sandy conditions may require more frequent inspections and replacements.

Q: OEM vs. Aftermarket?

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.