Water Pump Impeller Repair Kit – Fits Yamaha 9.9/15 HP (Replaces 63V-W0078-01-00)
Water Pump Impeller Repair Kit – Fits Yamaha 9.9/15 HP (Replaces 63V-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 Repair Kit – Fits Yamaha 9.9/15 HP (Replaces 63...
Water Pump Impeller Repair Kit – Fits Yamaha 9.9/15 HP (Replaces 63V-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit – Fits Yamaha 9.9/15 HP (1996-2024) is designed for a wide range of Yamaha 9.9 HP and 15 HP, 2-stroke and 4-stroke, 2-cylinder outboard engines manufactured between 1996 and 2024. The kit provides all essential components for a complete and reliable water pump service.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Yamaha 63V-W0078-00-00, 63V-W0078-01-00, 63V-W0078-02-00, 63V-W0078-03-00, Sierra 18-3433, and Mallory 9-48609.
- Installation is a direct OEM replacement.
- Kit includes a new impeller, housing plate, and all necessary gaskets.
- Engineered for fresh and salt water environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 63V-W0078-00-00 |
| Yamaha | 63V-W0078-01-00 |
| Yamaha | 63V-W0078-02-00 |
| Yamaha | 63V-W0078-03-00 |
| Sierra | 18-3433 |
| Sierra | 18-3412 |
| Mallory | 9-48609 |
| Mallory | 9-48617 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha Outboards: This kit fits various 2-cylinder, 2-stroke and 4-stroke models from 9.9 HP to 15 HP. Please verify your specific model and year range.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9 | 9.9 | 2-Stroke | 1996–2024 | 63V-W0078-01-00 | 2 cylinder models |
| Yamaha | 15 | 15 | 2-Stroke | 1996–2024 | 63V-W0078-01-00 | 2 cylinder models |
| Yamaha | F9.9 | 9.9 | 4-Stroke | 2005–2006 | 63V-W0078-01-00 | 2 cylinder models |
| Yamaha | T9.9 | 9.9 | 2-Stroke | 1996–2009 | 63V-W0078-01-00 | 2 cylinder models |
| Yamaha | F15 | 15 | 4-Stroke | 1998–2005 | 63V-W0078-01-00 | 2 cylinder models |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct OEM replacement
- Housing Color
- Green
- Other Technical Attributes
- Suitable for salt water use
What’s in the Box
- 1 x Water Pump Impeller (63V-44352-00-00/63V-44352-01-00)
- 1 x Housing Gasket
- 1 x Housing Plate
- 1 x Upper Gasket
- 1 x Lower Gasket
Installation Notes
- Disconnect the spark plug wires and shift the outboard into neutral.
- Remove the propeller and locate the lower unit mounting bolts.
- Carefully detach the lower unit from the engine housing to access the water pump.
- Unscrew the bolts on the water pump housing and remove it.
- Take note of the old impeller's orientation before removing it.
- Clean all mating surfaces and install the new gaskets, plate, and impeller.
- Ensure the impeller vanes are oriented correctly (typically by turning the driveshaft clockwise during installation).
- Reinstall the water pump housing, torquing bolts to manufacturer specifications.
- Re-attach the lower unit to the engine, ensuring all linkages are properly connected.
- Once assembled, test the engine in water to verify proper water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my specific Yamaha engine?
This kit is for Yamaha 9.9 HP and 15 HP 2-cylinder outboards (1996-2024). The surest way to confirm fitment is by matching your existing OEM part number to one listed in our Part Number Matrix, such as 63V-W0078-01-00. Also, check your engine model against our compatibility table.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or visible cracks and brittleness on the old impeller's vanes during inspection.
How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to inspect and/or replace the impeller every one to two years, or every 100-200 hours of use, depending on operating conditions (e.g., more frequently in sandy or silty water).
Is this kit difficult to install myself?
Installation requires basic mechanical skills and tools to drop the lower unit. While many boat owners perform this service, we recommend professional installation if you are not comfortable with the process to ensure safety and correct function.
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/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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