Description
Water Pump Impeller Repair KitFits Yamaha 40-60 HP Outboards (Replaces 63D-W0078-01-00)
This comprehensive water pump impeller repair kit is designed for Yamaha 40-50 HP 2-Stroke (19952009) and 40-60 HP 4-Stroke (19952009) outboard motors. It contains all necessary components for a complete and reliable water pump service.
It serves as a direct aftermarket replacement for Yamaha part numbers 63D-W0078-01-00, 63D-W0078-00-00, and 63D-W0078-0A-00, as well as aftermarket equivalents Sierra 18-3434 and GLM 12276.
- Provides a direct replacement solution for a complete rebuild.
- Includes a high-performance neoprene impeller for efficient cooling.
- Kit components are built to meet or exceed OEM specifications.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 63D-W0078-01-00 |
| Yamaha | 63D-W0078-00-00 |
| Yamaha | 63D-W0078-0A-00 |
| Sierra | 18-3434 |
| GLM | 12276 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Yamaha owners, heres a guide to help you identify your engines serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | Standard | 40 | 2-Stroke | 19952005 | 63D-W0078-01-00 |
| Yamaha | C40 | 40 | 2-Stroke | 19972003 | 63D-W0078-01-00 |
| Yamaha | P40 | 40 | 2-Stroke | 1998 | 63D-W0078-01-00 |
| Yamaha | Standard | 50 | 2-Stroke | 19982009 | 63D-W0078-01-00 |
| Yamaha | C50 | 50 | 2-Stroke | 19982001 | 63D-W0078-01-00 |
| Yamaha | P50 | 50 | 2-Stroke | 19951996 | 63D-W0078-01-00 |
| Yamaha | F40 | 40 | 4-Stroke | 1999 | 63D-W0078-01-00 |
| Yamaha | F50 | 50 | 4-Stroke | 19952009 | 63D-W0078-01-00 |
| Yamaha | F60 | 60 | 4-Stroke | 20022009 | 63D-W0078-01-00 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Repair Kit |
| Installation | Direct OEM Replacement |
| Housing Material | Metal alloy and neoprene rubber |
| Housing Color | Black |
Package Contents
- 1 x Neoprene Impeller (6H3-44352-00-00)
- 1 x Cartridge Outer Plate (63D-44323-00-00)
- 1 x Cartridge Insert/Cup (63D-44322-00-00)
- 1 x Water Pump Gasket (63D-44316-00-00)
- 1 x Woodruff Key (90280-03024-00)
- 1 x O-Ring (93210-59MG7-00)
- 1 x Water Pump Housing Cover (63D-44312-00-00)
- 1 x Water Seal Damper (663-44366-00-00)
- 1 x Installation Bolt With Washer (90119-08M15-00)
Installation Guide
- Disconnect the battery and shift linkage.
- Remove the lower unit from the outboard motor.
- Unbolt and remove the existing water pump housing.
- Remove the old impeller, plate, and gaskets, noting their orientation.
- Clean all mating surfaces thoroughly.
- Install the new gasket, wear plate, and impeller cup.
- Insert the new Woodruff key and slide the new impeller onto the driveshaft.
- Install the new housing and O-ring, tightening bolts to the manufacturer’s torque specifications.
- Reassemble the lower unit and reconnect all linkages.
- Test the engine in water to verify proper cooling system operation.
Troubleshooting & FAQ
Q: How can I be sure this kit will fit my Yamaha engine?
A: The best way to ensure compatibility is to verify your engine’s model and year against the “Compatible Engine Models” table. Additionally, you can cross-reference your existing part number with those listed in the “Part Number Cross-Reference” section.
Q: What are the symptoms of a failing water pump impeller?
A: Common signs include the engine overheating at low speeds, a weak or non-existent “telltale” water stream, or a dry, cracked, or deformed old impeller upon inspection.
Q: How often should the impeller be replaced?
A: As a general maintenance guideline, we recommend replacing the impeller every 1 to 2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
Q: Is this an OEM 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 shippingtypically 515 days worldwideand 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 existeven if your model is listeddo 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 515 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
