Water Pump Impeller Kit – Fits Yamaha 40/50/60HP 2-Stroke & 4-Stroke (Replaces 63D-W0078-01-00)

Water Pump Impeller Kit – Fits Yamaha 40/50/60HP 2-Stroke & 4-Stroke (Replaces 63D-W0078-01-00)

This water pump repair kit is designed for Yamaha outboard engines, containing all necessary components to service the water pump and restore proper cooling system function. It is compatible with a wide range of Yamaha 2-stroke and 4-stroke engines in the 40HP, 50HP, and 60HP categories.

This kit is a direct replacement for multiple Yamaha and Sierra part numbers, ensuring a precise fit and reliable performance for the specified engine models.

• Fits Yamaha 2-Stroke (40HP, 50HP) and 4-Stroke (F40, F50, F60) models.
• Includes a new housing, impeller, gaskets, and hardware for a complete rebuild.
• Engineered as a direct, ready-to-install replacement for the original 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 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: Disconnect the battery and remove the spark plug wires to prevent accidental starting. Tilt the outboard motor up and secure it.
2. Access the Lower Unit: Remove the bolts securing the lower unit (gearcase) to the engine's midsection. Carefully lower the unit to access the water pump.
3. Disassemble the Pump: Remove the bolts holding the water pump housing cover. Take note of the position of all parts as you remove them.
4. Inspect and Remove Old Parts: Remove the old housing, impeller, gaskets, and wear plates. Clean all mating surfaces thoroughly.
5. Install New Components: Lightly lubricate the new impeller and housing interior with marine grease. Install the new Woodruff key, impeller (turning clockwise), O-rings, and gaskets as per the kit.
6. Reassemble and Test: Reassemble the water pump housing and torque bolts to manufacturer specifications. Reinstall the lower unit, reconnect controls, and test the engine in water to confirm a steady stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How can I be sure this kit fits my exact Yamaha model?

A: The best way is to check the part number on your existing water pump housing or consult your engine's service manual. Cross-reference this number with those listed in our "Part Number Cross-Reference" table. Also, carefully check your model and year against our "Compatible Engine Models" list.

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

A: Common signs include an engine that is overheating, a weak or non-existent water stream from the "tell-tale" outlet port, and a dry, cracked, or brittle appearance of the old impeller upon inspection.

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

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.