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

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

This complete water pump impeller repair kit provides everything needed to restore the cooling system on compatible Yamaha 2-stroke and 4-stroke outboards. It is designed for 40, 50, and 60 horsepower models from 1997 to the current year, including F40, F50, and F60 series engines.

This kit is a direct replacement for Yamaha part numbers 63D-W0078-01 and 63D-W0078-01-00, as well as aftermarket parts from Sierra (18-3415, 18-3434), GLM (12276), and AM (AM63D-W0078-01).

• Complete Repair Kit: Includes the impeller, housing, wear plate, gaskets, and all necessary hardware for a full replacement.
• Durable Construction: Features a high-performance 6-blade neoprene impeller designed for efficient water flow and longevity.
• Installation Method: Engineered as a drop-in replacement for the original factory assembly.

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 4-Stroke Models

Yamaha 2-Stroke Models

Technical Specifications

Package Contents

• 1 x Full Power Plus Neoprene Impeller
• 1 x Wear Plate (Cartridge Outer Plate) (63D-44323-00-00)
• 1 x Insert Cup (Cartridge Insert) (63D-44322-00-00)
• 1 x Gasket Water Pump (63D-44316-00-00)
• 1 x O-Ring (93210-59MG7-00)
• 1 x Woodruff Key (90280-03024-00)
• 1 x Cover Pump Housing (63D-44312-00-00)
• 1 x Damper, Water Seal (663-44366-00-00)
• 4 x Installation bolts with washers (90119-08M15-00)

Explosion Diagram

Installation Guide

1. Disconnect the negative battery cable and remove the lower unit from the outboard motor.
2. Locate and unbolt the water pump housing assembly. Note the position of the bolts.
3. Carefully remove the old housing, wear plate, impeller, and gaskets.
4. Clean all mating surfaces thoroughly, removing any old gasket remnants or corrosion.
5. Install the new insert cup and wear plate into the housing.
6. Slide the new Woodruff key onto the driveshaft, ensuring it is properly seated.
7. Install the new neoprene impeller. Turn the driveshaft clockwise to help seat the blades correctly inside the cup.
8. Place the new gaskets and O-rings, then reinstall the pump housing cover.
9. Tighten the housing bolts evenly to the manufacturer's specified torque.
10. Reinstall the lower unit, reconnect the battery, and test the engine in water to verify a strong tell-tale stream.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Yamaha outboard?
A: This kit is designed for Yamaha 40, 50, and 60 HP outboards (1997-current). Please check the detailed "Compatible Engine Models" table and cross-reference your engine's model and year. Verifying the OEM part number (63D-W0078-01-00) against your current part is the most reliable method.

Q: What are the signs of a failing water pump impeller?
A: Common signs include the engine overheating, a weak or inconsistent "telltale" water stream, or a dry, cracked, or brittle appearance of the old impeller upon inspection.

Q: How often should I replace the water pump impeller?
A: For preventative maintenance, 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).

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.