Water Pump Impeller Repair Kit – Fits Yamaha 9.9/15 HP (1996-2024) (Replaces 63V-W0078-01-00)

Water Pump Impeller Repair Kit – Fits Yamaha 9.9/15 HP (1996-2024)

This water pump impeller repair kit is designed for Yamaha 9.9 HP & 15 HP, 2-Stroke & 4-Stroke, 2-cylinder outboard engines (1996-2024). It provides all necessary components for a complete and reliable water pump service.

This kit is a direct replacement for Yamaha part numbers 63V-W0078-00-00, 63V-W0078-01-00, 63V-W0078-02-00, and 63V-W0078-03-00, as well as several aftermarket equivalents.

• Includes a high-performance impeller, housing plate, and all required gaskets.
• Engineered for a direct OEM replacement fit.
• Constructed from materials suitable for salt water use.

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 Impeller (Replaces 63V-44352-00-00/63V-44352-01-00)
• 1 x Housing Gasket
• 1 x Housing Plate
• 1 x Upper Gasket
• 1 x Lower Gasket

Installation Guide

1. Safety First: Disconnect the engine's battery and shift the outboard into the neutral position.
2. Access the Pump: Remove the bolts securing the lower unit (gearcase) and carefully lower it from the midsection.
3. Disassemble Housing: Locate the water pump assembly on top of the gearcase. Unbolt and remove the pump housing to expose the impeller.
4. Remove Old Components: Take note of the impeller's rotational direction. Remove the old impeller, gaskets, and wear plate.
5. Clean Surfaces: Thoroughly clean all sealant and corrosion from the housing, plate, and gearcase mating surfaces.
6. Install New Gaskets: Place the new lower gasket and housing plate onto the gearcase.
7. Insert New Impeller: Slide the new impeller into the housing. Rotate the driveshaft in its normal direction of operation to help seat the impeller vanes correctly.
8. Reassemble and Secure: Reinstall the pump housing with the new upper gasket and tighten the bolts to the manufacturer's specified torque.
9. Final Steps: Reattach the lower unit to the engine, ensuring all connections are secure. Once assembled, test the engine using a water source ("muffs") to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

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

A: This kit is confirmed to fit Yamaha 9.9 HP and 15 HP, 2-stroke and 4-stroke, 2-cylinder models manufactured between 1996 and 2024. To be certain, please cross-reference your engine's model and year in the "Compatible Engine Models" table above.

Q: What are the signs that my water pump impeller is failing?

A: Common symptoms of a worn or damaged impeller include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or steam from the exhaust. We recommend visually inspecting the impeller during annual service.

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

A: As a preventative maintenance measure, it is best practice to replace your impeller every 1-2 years or every 100-200 hours of operation. Frequent use in saltwater or sandy/silty conditions may require more frequent replacement.

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.