Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke, F40/F50/F60 4-Stroke (Replaces 63D-W0078-01-00)

Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke, F40/F50/F60 4-Stroke (Replaces 63D-W0078-01-00)

This water pump impeller kit is designed for a range of Yamaha outboard motors, providing a comprehensive solution for cooling system maintenance. It fits specific Yamaha 2-Stroke 40/50 HP models produced between 1994 and 2005, and 4-Stroke F40, F50, and F60 HP models from 1996 to 2015.

This kit serves as a direct aftermarket replacement for Yamaha part number 63D-W0078-01-00 and JLM Marine part number 17KY011.

• Full Service Kit: Contains all necessary components, including the impeller, housing, plate, gaskets, and hardware for a complete overhaul.
• Installation: Designed as a direct OEM-fit replacement, requiring no modifications.
• Materials: Built with marine-grade materials to withstand demanding saltwater and freshwater conditions.

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 Water 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: Ensure the engine is off and disconnected from the power source. Allow the engine to cool completely before starting.
2. Access the Pump: Remove the lower unit (gearcase) assembly from the outboard's midsection to access the water pump.
3. Disassemble Housing: Carefully unbolt and remove the existing water pump housing. Pay close attention to the order and orientation of the components as you remove them.
4. Remove Old Parts: Take out the old impeller, gaskets, wear plate, and seals. Clean any corrosion or debris from the housing surfaces.
5. Install New Components: Place the new gasket and outer wear plate, then install the new woodruff key into its slot on the driveshaft.
6. Seat the Impeller: Slide the new impeller down the driveshaft over the key. Turn the driveshaft clockwise while pushing down to correctly seat the impeller vanes inside the housing cup.
7. Reassemble Housing: Install the new cartridge insert and O-ring. Secure the new housing cover with the provided bolts, tightening them evenly to the manufacturer's torque specifications.
8. Reinstall and Test: Reattach the lower unit to the engine. Once secured, start the engine in water to verify that water is exiting the tell-tale port, indicating proper pump function.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific Yamaha engine?
A: Review the 'Compatible Engine Models' tables on this page to match your engine's model, HP, stroke, and year range. For additional verification, you can use the linked Yamaha Serial Number Guide to confirm your engine's details before purchase.

Q: What are the symptoms of a failing water pump?
A: Common signs include a weak or inconsistent water stream from the engine's tell-tale outlet, engine overheating alarms, or a reduction in overall engine performance. A damaged or worn impeller is a frequent cause of these issues.

Q: How often should the water pump impeller be replaced?
A: As a general maintenance rule, it is recommended to inspect the impeller annually and replace it every 100-200 hours of operation or every 1-2 years, whichever comes first. Service intervals may need to be shorter in saltwater or silty/sandy water conditions.

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.