Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP Outboards (Replaces 63D-W0078-01-00)

Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP Outboards (Replaces 63D-W0078-01-00)

This comprehensive water pump impeller repair kit is designed for Yamaha 40-50 HP 2-Stroke (1995–2009) and 40-60 HP 4-Stroke (1995–2009) outboard motors. It contains all necessary components for a complete and reliable water pump service.

It serves as a direct aftermarket replacement for Yamaha part numbers 63D-W0078-01-00, 63D-W0078-00-00, and 63D-W0078-0A-00, as well as aftermarket equivalents Sierra 18-3434 and GLM 12276.

• Provides a direct replacement solution for a complete rebuild.
• Includes a high-performance neoprene impeller for efficient cooling.
• Kit components are built to meet or exceed OEM specifications.

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 Neoprene Impeller (6H3-44352-00-00)
• 1 x Cartridge Outer Plate (63D-44323-00-00)
• 1 x Cartridge Insert/Cup (63D-44322-00-00)
• 1 x Water Pump Gasket (63D-44316-00-00)
• 1 x Woodruff Key (90280-03024-00)
• 1 x O-Ring (93210-59MG7-00)
• 1 x Water Pump Housing Cover (63D-44312-00-00)
• 1 x Water Seal Damper (663-44366-00-00)
• 1 x Installation Bolt With Washer (90119-08M15-00)

Installation Guide

1. Disconnect the battery and shift linkage.
2. Remove the lower unit from the outboard motor.
3. Unbolt and remove the existing water pump housing.
4. Remove the old impeller, plate, and gaskets, noting their orientation.
5. Clean all mating surfaces thoroughly.
6. Install the new gasket, wear plate, and impeller cup.
7. Insert the new Woodruff key and slide the new impeller onto the driveshaft.
8. Install the new housing and O-ring, tightening bolts to the manufacturer's torque specifications.
9. Reassemble the lower unit and reconnect all linkages.
10. Test the engine in water to verify proper cooling system operation.

Troubleshooting & FAQ

Q: How can I be sure this kit will fit my Yamaha engine?

A: The best way to ensure compatibility is to verify your engine's model and year against the "Compatible Engine Models" table. Additionally, you can cross-reference your existing part number with those listed in the "Part Number Cross-Reference" section.

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

A: Common signs include the engine overheating at low speeds, a weak or non-existent "telltale" water stream, or a dry, cracked, or deformed old impeller upon inspection.

Q: How often should the impeller be replaced?

A: As a general maintenance guideline, we recommend replacing the impeller every 1 to 2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).

Q: Is this an OEM part?

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.