Water Pump Impeller Repair Kit for Yamaha 40/50/60 HP Outboards – Replaces 63D-W0078-01-00 and 6H3-44352-00-00
Water Pump Impeller Repair Kit for Yamaha 40/50/60 HP Outboards – Replaces 63D-W0078-01-00 and 6H3-44352-00-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit for Yamaha 40/50/60 HP Outboards – R...
Water Pump Impeller Repair Kit for Yamaha 40/50/60 HP Outboards – Replaces 63D-W0078-01-00 and 6H3-44352-00-00 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit for Yamaha 40/50/60 HP Outboards provides a complete solution for servicing selected Yamaha 40, 50, and 60 HP outboard engines. It is listed for Yamaha 2-Stroke 40/50 HP models from 1997–2006 and selected 4-Stroke F40, F50, and F60 models from 1997 onward. Replacing worn water-pump components helps restore proper cooling-water circulation and reduce the risk of overheating.
The kit is intended as an aftermarket replacement for Yamaha water-pump references 63D-W0078-00-00, 63D-W0078-01-00, 63D-W0078-02-00, and 63D-W0078-03-00. The included impeller corresponds to Yamaha reference 6H3-44352-00-00 and Sierra aftermarket reference 18-3434.
- Designed for direct-replacement water-pump service on the listed applications.
- Includes a neoprene impeller and stainless-steel pump components for freshwater or saltwater service.
- Includes pump seals, gasket, O-ring, key, fasteners, and related components shown in the package list.
Part Number Matrix
Use the following references to compare the kit and its included impeller with the part being replaced. Confirm the exact engine model and year before ordering.
| Brand | Part Number | Application or Reference |
|---|---|---|
| Yamaha | 63D-W0078-01-00 | Water pump kit reference |
| Yamaha | 63D-W0078-00-00 | Related or superseded kit reference |
| Yamaha | 63D-W0078-02-00 | Related or superseded kit reference |
| Yamaha | 63D-W0078-03-00 | Related or superseded kit reference |
| Yamaha | 6H3-44352-00-00 | Impeller reference; included component |
| Sierra | 18-3434 | Aftermarket impeller reference |
Engine and Model Compatibility
Fitment depends on the complete model designation and production year, not horsepower alone. Verify your engine against the table below before purchase.
| Brand | Model | Rated HP | Stroke | Years | Reference | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40EJRV, 40EJRW, 40EJRX | 40 | 2-Stroke | 1997–1999 | 63D-W0078-01-00 | |
| Yamaha | 40ELRV, 40ELRW | 40 | 2-Stroke | 1997–1998 | 63D-W0078-01-00 | |
| Yamaha | 40ESRV, 40ESRW, 40ESRX | 40 | 2-Stroke | 1997–1999 | 63D-W0078-01-00 | |
| Yamaha | 40MJHV-Z | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01-00 | |
| Yamaha | 40MLHV-Z | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01-00 | |
| Yamaha | 40MSHV-X | 40 | 2-Stroke | 1997–1999 | 63D-W0078-01-00 | |
| Yamaha | 40TLHV | 40 | 2-Stroke | 1997 | 63D-W0078-01-00 | |
| Yamaha | 40TLR, 40TLRA-D | 40 | 2-Stroke | 2002–2005 | 63D-W0078-01-00 | |
| Yamaha | 40TLRV-Z | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01-00 | |
| Yamaha | C40TLRV-Z | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01-00 | Commercial model |
| Yamaha | C40TLRA-B | 40 | 2-Stroke | 2002–2003 | 63D-W0078-01-00 | Commercial model |
| Yamaha | P40TLHW, P40TLRW | 40 | 2-Stroke | 1998 | 63D-W0078-01-00 | |
| Yamaha | 50EJRV-Z | 50 | 2-Stroke | 1997–2001 | 63D-W0078-01-00 | |
| Yamaha | 50ELRV, 50ELRW | 50 | 2-Stroke | 1997–1998 | 63D-W0078-01-00 | |
| Yamaha | 50TLHV | 50 | 2-Stroke | 1997 | 63D-W0078-01-00 | |
| Yamaha | 50TLR, 50TLRA-D | 50 | 2-Stroke | 2002–2005 | 63D-W0078-01-00 | |
| Yamaha | 50TLRV, 50TLRZ | 50 | 2-Stroke | 1997, 2001 | 63D-W0078-01-00 | |
| Yamaha | C50TLRW-Z | 50 | 2-Stroke | 1998–2001 | 63D-W0078-01-00 | Commercial model |
| Yamaha | F40TLRX | 40 | 4-Stroke | 1999 | 63D-W0078-01-00 | |
| Yamaha | F50TLHV | 50 | 4-Stroke | 1997 | 63D-W0078-01-00 | |
| Yamaha | F50TLRV-Z | 50 | 4-Stroke | 1997–2001 | 63D-W0078-01-00 | |
| Yamaha | F50TLRA-D | 50 | 4-Stroke | 2002–2005 | 63D-W0078-01-00 | |
| Yamaha | F50TLR | 50 | 4-Stroke | 2005–2011 | 63D-W0078-01-00 | |
| Yamaha | F50LA, F50LB | 50 | 4-Stroke | 2012–2016 | 63D-W0078-01-00 | |
| Yamaha | F60TJRB-D | 60 | 4-Stroke | 2003–2005 | 63D-W0078-01-00 | |
| Yamaha | F60TJR | 60 | 4-Stroke | 2005–2007 | 63D-W0078-01-00 | |
| Yamaha | F60TLRA-D | 60 | 4-Stroke | 2002–2005 | 63D-W0078-01-00 | |
| Yamaha | F60TLR | 60 | 4-Stroke | 2005–2011 | 63D-W0078-01-00 | |
| Yamaha | F60JA, F60JB | 60 | 4-Stroke | 2012–2016 | 63D-W0078-01-00 | |
| Yamaha | F60LA, F60LB | 60 | 4-Stroke | 2012–2016 | 63D-W0078-01-00 | |
| Yamaha | F60LHA, F60LHB | 60 | 4-Stroke | 2011–2016 | 63D-W0078-01-00 | |
| Yamaha | T50TLRV | 50 | 4-Stroke | 1997 | 63D-W0078-01-00 | High Thrust |
| Yamaha | T50TLRC | 50 | 4-Stroke | 2004 | 63D-W0078-01-00 | High Thrust |
Technical Specifications
- Product Type
- Water pump impeller repair kit
- Installation
- Direct replacement for listed applications
- Material
- Neoprene impeller with stainless-steel pump components
- Package Dimensions
- 15.8 × 10.2 × 5.1 cm (6.22 × 4.02 × 2.01 inches)
- Package Weight
- 0.24 kg (8.4 oz)
- Related Water Pump References
- 63D-W0078-00-00, 63D-W0078-01-00, 63D-W0078-02-00, 63D-W0078-03-00
- Included Impeller Reference
- 6H3-44352-00-00
What's in the Box
- 1 × Cartridge insert (63D-44322-00-00)
- 1 × Impeller (6H3-44352-00-00)
- 1 × Pump housing cover (63D-44312-00-00)
- 1 × Cartridge outer plate (63D-44323-00-00)
- 1 × O-ring (93210-59MG7-00)
- 1 × Water pump gasket (63D-44316-00-00)
- 4 × Bolts with washers (90119-08M15-00)
- 1 × Water seal damper 2 (663-44366-00-00)
- 1 × Woodruff key (90280-03024-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the lower-unit gear lubricant.
- Remove the propeller and lower-unit mounting bolts.
- Carefully separate the lower unit from the upper casing.
- Remove the old water-pump housing assembly.
- Clean all mating surfaces and remove old gasket material.
- Install the new woodruff key, impeller, gaskets, and seals from the kit.
- Install the pump housing with the impeller fins oriented in the correct direction for the engine.
- Torque the housing bolts according to the engine manufacturer's specifications.
- Reinstall the lower unit, aligning the water tube and driveshaft correctly.
- Refill the gear lubricant with the recommended product.
- Test the engine in water and verify that cooling water exits the tell-tale outlet.
Use the service manual for the specific engine when confirming torque values, impeller rotation, lubricant type, and reassembly procedures.
Troubleshooting and FAQ
How do I know if the water pump is failing?
Common signs include a weak or absent tell-tale stream, an overheating warning, or reduced cooling performance. Stop operating the engine if overheating occurs and inspect the cooling system.
How often should the impeller be inspected?
Inspect the impeller during routine maintenance and replace it when it is worn, cracked, deformed, or damaged. Replacement intervals can vary with operating hours, storage conditions, and exposure to saltwater or sand.
Do I need special tools?
Basic mechanical tools, a torque wrench, and a gasket scraper are typically required. The exact tools depend on the engine model and the manufacturer's service procedure.
My engine has the correct horsepower but is not listed. Will this kit fit?
Do not determine compatibility by horsepower alone. Confirm the complete model designation, year, stroke, and the water-pump reference for your engine before ordering.
What is the purpose of the woodruff key?
The woodruff key locks the impeller to the driveshaft so the impeller rotates with the shaft and circulates cooling water. Replace a damaged or worn key during water-pump service.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the listed applications. Yamaha and Sierra references are provided only for identification and interchange comparison.
Safety and Important Information
- Verify the complete engine model and year, the original pump configuration, and the reference numbers before purchase.
- Do not operate an outboard without a reliable cooling-water supply.
- Follow the engine service manual for disassembly, torque values, lubrication, and testing.
- Professional installation is recommended when you are not familiar with lower-unit or water-pump service.
About Sea Sierra
- Marine replacement parts selected for practical maintenance and repair applications.
- Replacement references are provided to help customers compare the original component before ordering.
- Support is available for product and fitment questions when the complete engine model information is provided.
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