Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke (1994-2005) & F40/F50/F60 4-Stroke (1996+) (Replaces 63D-W0078-01-00)

Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke (1994-2005) & F40/F50/F60 4-Stroke (1996+) (Replaces 63D-W0078-01-00)Water Pump Impeller Kit Fits Yamaha 40 50 HP 2 Stroke & F40 F50 F60 4 Stroke This water pump impeller repair kit is designed for a wide range of Yamaha outboard engines, including Yamaha 2 Stroke 40 50 HP (19942005) models such as the C40, P40, C50, and P50 series. It also fits Yamaha 4 Stroke F40 (1999), F50 (1997 and newer), and F60 (2002 and newer) outboard engines. It serves as a direct replacement for Yamaha OEM part numbers 63D W0078 01 00, 63D

Water Pump Impeller Kit – Fits Yamaha 40/50 HP 2-Stroke & F40/F50/F60 4-Stroke

This water pump impeller repair kit is designed for a wide range of Yamaha outboard engines, including Yamaha 2-Stroke 40/50 HP (1994–2005) models such as the C40, P40, C50, and P50 series. It also fits Yamaha 4-Stroke F40 (1999), F50 (1997 and newer), and F60 (2002 and newer) outboard engines.

It serves as a direct replacement for Yamaha OEM part numbers 63D-W0078-01-00, 63D-W0078-03-00, 63D-W0078-02-00, and 63D-W0078-00-00, ensuring a precise fit and restoring cooling system performance. This kit provides all the necessary components for a complete and professional water pump service.

• Comprehensive Kit: Includes impeller, housing, gaskets, plate, and hardware for a full overhaul.
• Direct Replacement: Engineered to meet OEM specifications for a direct, hassle-free installation.
• Quality Manufacturing: Produced in an ISO9002-certified facility to ensure reliability and durability.

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 the spark plug wires before beginning work.
2. Drain Gearcase Oil: Place a drain pan under the lower unit and remove the drain/fill screws to empty the gearcase oil.
3. Remove Lower Unit: Unbolt the lower unit (outdrive) from the upper section of the engine. This may require removing a trim tab to access a hidden bolt.
4. Access the Water Pump: With the lower unit removed, locate and unbolt the water pump housing cover.
5. Inspect and Replace: Remove the old impeller, gaskets, plates, and seals. Clean all mating surfaces thoroughly, checking for corrosion or wear.
6. Install New Components: Install the new components from the kit in the reverse order of disassembly. Lightly grease the new impeller and insert it while turning the driveshaft clockwise.
7. Reassemble: Reinstall the water pump housing, ensuring bolts are torqued to the manufacturer's specification. Reattach the lower unit to the engine and refill the gearcase with fresh oil.
8. Test Operation: Reconnect the battery and spark plugs. Start the engine using a water source (flushing muffs) and verify a strong, steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Yamaha engine?

A: The best way is to match your engine's model and year to the compatibility tables provided above. We also recommend using the official Yamaha Serial Number Guide and Parts Catalog linked above to cross-reference the OEM part number (63D-W0078-01-00) with your specific engine diagram.

Q: What are the signs my water pump impeller needs replacing?

A: Common indicators of a failing impeller include the engine overheating alarm sounding, a weak or intermittent water stream from the "tell-tale" outlet, or a temperature gauge reading higher than normal. Visual inspection during regular maintenance may also reveal cracked, brittle, or worn impeller vanes.

Q: How often should I replace the impeller?

A: As a general maintenance guideline, we recommend replacing the water pump impeller and gaskets every 1 to 2 years or every 100-200 operating hours, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.

Q: Is this an OEM part or an aftermarket part?

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.