Water Pump Impeller Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-01-00)
Water Pump Impeller Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-01-00) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-...
Water Pump Impeller Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit provides a complete solution for servicing the cooling system on Yamaha 40–60 HP outboards (1997–current), including F40, F50, and F60 models. It is engineered for a direct, drop-in fit to restore your engine's cooling performance and reliability.
It serves as a direct interchange for Yamaha part numbers 63D-W0078-01/63D-W0078-01-00, Sierra 18-3415/18-3434, GLM 12276, and AM63D-W0078-01.
- Installation: Designed for a simple drop-in replacement.
- Impeller Design: Features a durable neoprene impeller with a 6-blade design to ensure optimal water flow.
- Complete Kit: Includes all necessary gaskets, plates, a woodruff key, and hardware for a full overhaul.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Yamaha | 63D-W0078-01-00 |
| Yamaha | 63D-W0078-01 |
| Sierra | 18-3415 |
| Sierra | 18-3434 |
| GLM | 12276 |
| AM | AM63D-W0078-01 |
Engine & Model Compatibility
Confirm your engine model and year in the table below. This kit is designed for a wide range of Yamaha 2-stroke and 4-stroke outboards.
| Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Yamaha 4-Stroke Models | ||||
| F40 | 40 | 4-Stroke | 1999 | 63D-W0078-01-00 |
| F50 | 50 | 4-Stroke | 1997–current | 63D-W0078-01-00 |
| F60 | 60 | 4-Stroke | 2002–current | 63D-W0078-01-00 |
| Yamaha 2-Stroke Models | ||||
| 40 (Standard) | 40 | 2-Stroke | 1997–2003 | 63D-W0078-01-00 |
| C40 | 40 | 2-Stroke | 1998–2003 | 63D-W0078-01-00 |
| P40 | 40 | 2-Stroke | 1997–1998 | 63D-W0078-01-00 |
| 50 (Standard) | 50 | 2-Stroke | 1997–2005 | 63D-W0078-01-00 |
| C50 | 50 | 2-Stroke | 1998–2001 | 63D-W0078-01-00 |
| P50 | 50 | 2-Stroke | 1997–current | 63D-W0078-01-00 |
| T50 | 50 | 2-Stroke | 1997–2004 | 63D-W0078-01-00 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Drop-in Replacement
- Impeller Blades
- 6
- Impeller Material
- Neoprene
- Weight
- 0.234 kg (0.51 lb)
- Warranty
- 1 Year (aftermarket)
What’s in the Box
- 1 x Full Power Plus Neoprene Impeller
- 1 x Wear Plate (Cartridge Outer Plate) (63D-44323-00-00)
- 1 x Insert Cup (Cartridge Insert) (63D-44322-00-00)
- 1 x Gasket Water Pump (63D-44316-00-00)
- 1 x O-Ring (93210-59MG7-00)
- 1 x Woodruff Key (90280-03024-00)
- 1 x Cover Pump Housing (63D-44312-00-00)
- 1 x Damper, Water Seal (663-44366-00-00)
- 4 x Installation bolts with washers (90119-08M15-00)
Installation Notes
- Disconnect the negative battery cable before starting work.
- Remove the lower unit (gearcase) from the outboard motor.
- Unbolt and carefully remove the existing water pump housing.
- Take note of the old components' orientation, then remove the old impeller, wear plate, gaskets, and seals.
- Thoroughly clean all mating surfaces, removing any old gasket material or corrosion.
- Install the new water seal damper, gasket, wear plate, and woodruff key from the kit.
- Slide the new impeller onto the driveshaft, rotating it clockwise to seat the blades correctly inside the new insert cup and housing.
- Secure the new pump housing cover with the new bolts and re-install the lower unit. Reconnect the battery.
- Test the engine in water immediately to verify proper water pump operation (check for a steady stream from the tell-tale).
Troubleshooting & FAQ
How do I know if this kit fits my engine?
This kit is designed for Yamaha 40, 50, and 60 HP outboards made from 1997 to the present. Please review the detailed "Engine & Model Compatibility" table and cross-reference your specific engine model and year. Verifying the OEM part number (63D-W0078-01-00) against your service manual is the best way to ensure a perfect match.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or intermittent water stream from the "tell-tale" outlet, engine overheating alarms, or a noticeable decrease in engine performance. If you see any of these signs, inspect your water pump immediately.
How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., more frequently in saltwater or silty environments).
What's the main difference between this aftermarket kit and an OEM one?
This aftermarket kit is engineered to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It offers a cost-effective solution without compromising on the quality of materials, like the durable neoprene impeller, providing comparable performance and longevity to the original part.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is highly recommended for safety and optimal performance. Incorrect installation can lead to engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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