Water Pump Impeller Repair Kit – Fits Yamaha 40/50/60 HP Outboards (Replaces 63D-W0078-01-00, 6H3-44352-00-00)

Water Pump Impeller Repair Kit – Fits Yamaha 40/50/60 HP Outboards

This water pump impeller repair kit provides a complete solution for servicing the cooling system on a wide range of Yamaha outboards. It is designed for Yamaha 2-Stroke 40 HP and 50 HP models (1997–2006) and 4-Stroke F40, F50, and F60 models (1997–Current).

Engineered as a direct replacement for OEM part numbers 63D-W0078-01-00, this kit ensures proper fit and function, restoring your engine's cooling performance and preventing overheating.

• Includes a high-quality neoprene impeller, stainless steel cup and plate, and necessary gaskets and seals for a comprehensive installation.
• Crafted for direct OEM replacement, ensuring seamless installation without modifications.
• Restores cooling system efficiency, a critical maintenance task for engine longevity and reliability.

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 Models

Yamaha 4-Stroke Models

Technical Specifications

Package Contents

• 1 x Cartridge Insert (63D-44322-00-00)
• 1 x Impeller (6H3-44352-00-00)
• 1 x Pump Housing Cover (63D-44312-00-00)
• 1 x Cartridge Outer Plate (63D-44323-00-00)
• 1 x O-Ring (93210-59MG7-00)
• 1 x Water Pump Gasket (63D-44316-00-00)
• 4 x Bolts with Washers (90119-08M15-00)
• 1 x Water Seal Damper 2 (663-44366-00-00)
• 1 x Woodruff Key (90280-03024-00)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine cannot start accidentally. Disconnect the shift linkage before proceeding.
2. Remove Lower Unit: Remove the mounting bolts that secure the lower unit (gearcase) to the engine's midsection and carefully lower it.
3. Access the Pump: With the lower unit removed, locate and unbolt the water pump housing (typically 4-5 bolts).
4. Disassemble Old Pump: Remove the old housing, impeller, wear plate, gaskets, and seals. Take note of the orientation of the old impeller's fins.
5. Clean Surfaces: Thoroughly clean the mounting surfaces on the driveshaft and lower unit to remove any old gasket material or corrosion.
6. Install New Components: Install the new water pump gasket, outer plate, and Woodruff key on the driveshaft.
7. Install Impeller: Slide the new impeller onto the driveshaft, rotating it clockwise to bend the vanes correctly as it enters the lubricated housing.
8. Reassemble Housing: Secure the new housing with the new bolts and tighten them to the manufacturer's specified torque.
9. Reinstall Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align. Re-secure the mounting bolts.
10. Final Checks: Reconnect the shift linkage and battery. Test the engine on a water supply (using "ear muffs" or in the water) and confirm a steady stream 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 cross-reference your engine's model and year with the detailed lists in the 'Compatible Engine Models' section. Verifying the OEM part number (63D-W0078-01-00) against your service manual or existing part also ensures a correct match.

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

A: Key signs include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "telltale" outlet, or finding brittle, cracked, or missing vanes on the old impeller during inspection.

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

A: As a crucial part of preventative maintenance, we recommend replacing the impeller every 1 to 2 years or every 100-200 hours of use. This can vary based on operating conditions, especially in saltwater or sandy/silty environments.

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.