Water Pump Impeller Repair Kit for Yamaha 40–60HP Outboards – 2-Stroke and F50/F60 4-Stroke – Replaces 63D-W0078-00, 63D-W0078-01-00 and 63D-W0078-03-00
Water Pump Impeller Repair Kit for Yamaha 40–60HP Outboards – 2-Stroke and F50/F60 4-Stroke – Replaces 63D-W0078-00, 63D-W0078-01-00 and 63D-W0078-03-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit for Yamaha 40–60HP Outboards – 2-Str...
Water Pump Impeller Repair Kit for Yamaha 40–60HP Outboards – 2-Stroke and F50/F60 4-Stroke – Replaces 63D-W0078-00, 63D-W0078-01-00 and 63D-W0078-03-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller repair kit is designed for selected Yamaha 40–60HP outboard applications. Cataloged applications include Yamaha 40HP and 50HP 2-stroke models from the 1990s, as well as selected Yamaha F50 and F60 4-stroke models from 2021 through 2024. Always match the complete engine model, year, stroke, and original part number before ordering.
The kit is associated with Yamaha water pump repair kit references 63D-W0078-00, 63D-W0078-00-00, 63D-W0078-01-00, and 63D-W0078-03-00. Equivalent references can vary by engine application; these numbers should not be treated as a universal fitment claim.
- Services the water pump in the lower unit or gear case.
- Helps restore cooling-water circulation when the existing impeller is worn or damaged.
- Suitable for selected Yamaha 40–60HP 2-stroke and F50/F60 4-stroke applications listed below.
- Aftermarket replacement kit; not a Genuine Yamaha part.
Part Number References
The following manufacturer and aftermarket references are associated with this water pump repair kit in the available parts data. Verify the number shown on your original part and confirm the engine application before installation.
| Brand | Part Number | Reference Type |
|---|---|---|
| Yamaha | 63D-W0078-00 | Primary catalog reference |
| Yamaha | 63D-W0078-00-00 | Application reference |
| Yamaha | 63D-W0078-01-00 | Application reference |
| Yamaha | 63D-W0078-03-00 | Application reference |
| Sierra | 18-3415 | Aftermarket cross-reference |
| Sierra | 18-3434 | Aftermarket cross-reference |
Engine & Model Compatibility
Fitment is application-specific. The records available for these references confirm the following representative Yamaha applications. Models, years, stroke type, and serial-number conditions must be matched together.
| Brand | Model | Rated HP | Stroke | Years | Reference | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40EJRV, 40ELRV, 40ESRV, 40MJHV, 40MLHV, 40MSHV, 40TLHV, 40TLRV | 40 | 2-Stroke | 1997 | 63D-W0078-01-00 | Water pump repair kit application |
| Yamaha | 40EJRW, 40ELRW, 40ESRW, 40MJHW, 40MLHW, 40MSHW, 40TLRW | 40 | 2-Stroke | 1998 | 63D-W0078-01-00 | Water pump repair kit application |
| Yamaha | 40EJRT, 40ELRT, 40ESRT, 40MJHT, 40MLHT, 40MSHT, 40TLRT | 40 | 2-Stroke | 1995 | 63D-W0078-00-00 | Water pump repair kit application |
| Yamaha | 40EJRU, 40ELRU, 40ESRU, 40MJHU, 40MLHU, 40MSHU, 40TLHU | 40 | 2-Stroke | 1996 | 63D-W0078-00-00 | Water pump repair kit application |
| Yamaha | 50EJRV, 50ELRV, 50TLHV, 50TLRV | 50 | 2-Stroke | 1997 | 63D-W0078-01-00 | Water pump repair kit application |
| Yamaha | 50EJRW, 50ELRW, 50TLHW | 50 | 2-Stroke | 1998 | 63D-W0078-01-00 | Water pump repair kit application |
| Yamaha | F50LB, F50LB2 | 50 | 4-Stroke | 2021–2024 | 63D-W0078-03-00 | Selected models and configurations |
| Yamaha | F60JB, F60LB | 60 | 4-Stroke | 2021–2024 | 63D-W0078-03-00 | Selected models and configurations |
Technical Specifications
- Product Type
- Water pump impeller repair kit
- Installation Location
- Lower unit / gear case water pump
- Engine Brand
- Yamaha applications listed above
- Stroke Types
- Selected 2-stroke and 4-stroke applications
- Product Status
- Aftermarket replacement part
What’s in the Box
This listing is for one water pump repair kit. The kit is intended to provide the water pump service components required for the applicable cataloged application. Component shape and included hardware may vary by application, so compare the kit with the original assembly before installation.
- Water pump impeller
- Water pump service gaskets and seals as supplied for the application
- Additional repair components or hardware where supplied with the applicable kit
Installation Notes
- Disconnect the battery and place the outboard in neutral.
- Remove the lower unit according to the engine manufacturer's service procedure.
- Remove the water pump housing and retain the original component positions for reference.
- Remove the old impeller and inspect the housing, wear surfaces, keyway, and driveshaft for damage.
- Clean all mating surfaces and remove old gasket material without damaging the sealing faces.
- Install the supplied repair components in the same orientation as the original assembly.
- Apply only the lubricant or sealant specified by the engine service manual.
- Reassemble the water pump housing and tighten fasteners to the manufacturer's specified torque.
- Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Run the engine in a suitable water supply and confirm a strong telltale stream and normal operating temperature before use.
Troubleshooting & FAQ
How do I confirm fitment?
Match the complete Yamaha model designation, horsepower, stroke type, model year, and original water pump repair-kit reference. Do not rely on horsepower alone. If the exact model is not listed, verify the application against the engine service manual or an authorized parts catalog before ordering.
What are the symptoms of a worn water pump impeller?
Common symptoms include overheating at idle or low speed, a weak or missing telltale stream, reduced cooling-water flow, or an engine temperature warning. Inspect the complete cooling system before replacing the impeller.
How often should the impeller be replaced?
Replacement intervals depend on operating hours, storage conditions, and water quality. Follow the maintenance schedule for your specific engine and inspect the impeller more frequently when operating in sandy, silty, or polluted water.
Is this a Genuine Yamaha part?
No. This is an aftermarket replacement water pump repair kit. Yamaha names and part numbers are used only to identify compatible applications and reference numbers.
Are tools and sealants included?
No. Installation requires suitable hand tools and any marine lubricant or sealant specified by the engine service manual. Additional service parts may be required if the pump housing, key, driveshaft, or other components are damaged.
Safety & Important Information
- Verify the exact engine model, year, stroke type, and original part number before ordering.
- Do not operate an outboard with a suspected cooling-system failure or without confirming water flow after service.
- Use the manufacturer's torque values and installation procedures; incorrect assembly can cause overheating and engine damage.
- Professional installation by a qualified marine technician is recommended.
About Sea Sierra
- Marine Replacement Parts — We provide aftermarket components for routine maintenance and repair of marine systems.
- Application-Focused Listings — Fitment information is organized by model, year, horsepower, and stroke type to support more accurate part selection.
- Customer Support — Contact support with your complete engine model and original part number if you need help confirming an application.
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