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)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

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.