Water Pump Impeller Repair Kit – Fits Yamaha 9.9HP/15HP Outboards (Replaces 63V-W0078-00-00, 63V-W0078-01-00)
Water Pump Impeller Repair Kit – Fits Yamaha 9.9HP/15HP Outboards (Replaces 63V-W0078-00-00, 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 9.9HP/15HP Outboards (...
Water Pump Impeller Repair Kit – Fits Yamaha 9.9HP/15HP Outboards (Replaces 63V-W0078-00-00, 63V-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This comprehensive Water Pump Impeller Repair Kit is designed for Yamaha 9.9HP and 15HP outboard engines, covering 2-Stroke models from 1996 to 2009 and 4-Stroke models from 1998 to 2009. It contains all necessary components to restore your engine's cooling system to factory specifications, preventing overheating and ensuring reliable performance on the water.
This kit serves as a direct replacement for Yamaha part numbers 63V-W0078-00-00, 63V-W0078-01-00, 63V-W0078-02-00, 63V-W0078-03-00, and 63V-W0078-04-00. It also interchanges with Sierra 18-3412 / 18-3433 and GLM 12066.
- Engineered for direct OEM replacement and fit.
- Manufactured to meet or exceed original equipment specifications.
- Includes essential hardware for a complete service.
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 |
| Yamaha | 63V-W0078-04-00 |
| Sierra | 18-3412 |
| Sierra | 18-3433 |
| GLM | 12066 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is specifically designed for the following Yamaha outboard motors.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9ELHU | 9.9 | 2-Stroke | 1996 | 63V-W0078-00-00 | |
| Yamaha | 9.9ELHV | 9.9 | 2-Stroke | 1997 | 63V-W0078-00-00 | |
| Yamaha | 9.9ELRU | 9.9 | 2-Stroke | 1996 | 63V-W0078-00-00 | |
| Yamaha | 9.9ELRV | 9.9 | 2-Stroke | 1997 | 63V-W0078-00-00 | |
| Yamaha | 9.9ESHU | 9.9 | 2-Stroke | 1996 | 63V-W0078-00-00 | |
| Yamaha | 9.9ESHV | 9.9 | 2-Stroke | 1997 | 63V-W0078-00-00 | |
| Yamaha | 9.9MLHU/V/W/X/Y | 9.9 | 2-Stroke | 1996–2000 | 63V-W0078-00-00 | |
| Yamaha | 9.9MSH | 9.9 | 2-Stroke | 2005–2009 | 63V-W0078-04-00 | Later supersession |
| Yamaha | 9.9MSHA/B/C/D | 9.9 | 2-Stroke | 2002–2005 | 63V-W0078-01-00 | |
| Yamaha | 9.9MSHKZ | 9.9 | 2-Stroke | 2001 | 63V-W0078-01-00 | |
| Yamaha | 9.9MSHU/V/W/X/Y/Z | 9.9 | 2-Stroke | 1996–2001 | 63V-W0078-00-00 | |
| Yamaha | F9.9ELR2/D/K | 9.9 | 4-Stroke | 2005–2006 | 63V-W0078-03-00 | |
| Yamaha | F9.9MLH2/D/K | 9.9 | 4-Stroke | 2005–2006 | 63V-W0078-03-00 | |
| Yamaha | F9.9MSH2/D/K | 9.9 | 4-Stroke | 2005–2006 | 63V-W0078-03-00 | |
| Yamaha | T9.9ELH2/D/K | 9.9 | 4-Stroke | 2005–2006 | 63V-W0078-03-00 | |
| Yamaha | T9.9ELR2/D/K | 9.9 | 4-Stroke | 2005–2006 | 63V-W0078-03-00 | |
| Yamaha | T9.9EXH2/D/K | 9.9 | 4-Stroke | 2005–2006 | 63V-W0078-03-00 | |
| Yamaha | 15ELHU | 15 | 2-Stroke | 1996 | 63V-W0078-00-00 | |
| Yamaha | 15ELHV | 15 | 2-Stroke | 1997 | 63V-W0078-00-00 | |
| Yamaha | 15ELRU | 15 | 2-Stroke | 1996 | 63V-W0078-00-00 | |
| Yamaha | 15ESHU | 15 | 2-Stroke | 1996 | 63V-W0078-00-00 | |
| Yamaha | 15ESHV | 15 | 2-Stroke | 1997 | 63V-W0078-00-00 | |
| Yamaha | 15MLHU/V/W/X/Y | 15 | 2-Stroke | 1996–2000 | 63V-W0078-00-00 | |
| Yamaha | 15MSH | 15 | 2-Stroke | 2005–2009 | 63V-W0078-04-00 | Later supersession |
| Yamaha | 15MSHA/B/C/D | 15 | 2-Stroke | 2002–2005 | 63V-W0078-01-00 | |
| Yamaha | 15MSHKZ | 15 | 2-Stroke | 2001 | 63V-W0078-01-00 | |
| Yamaha | 15MSHU/V/W/X/Y/Z | 15 | 2-Stroke | 1996–2001 | 63V-W0078-00-00 | |
| Yamaha | F15ELH/A/B/C/D/K | 15 | 4-Stroke | 1999–2005 | 63V-W0078-03-00 | |
| Yamaha | F15ESH/A/B/C/D/K | 15 | 4-Stroke | 1998–2005 | 63V-W0078-03-00 | |
| Yamaha | F15MLH/A/C/D/W/Z | 15 | 4-Stroke | 1998–2005 | 63V-W0078-03-00 | |
| Yamaha | F15MSH/B/C/D/K | 15 | 4-Stroke | 1998–2005 | 63V-W0078-03-00 | |
| Yamaha | F15PLH/A/B/C/D/K | 15 | 4-Stroke | 2001–2006 | 63V-W0078-03-00 | |
| Yamaha | F15PLR/B/C/D/K | 15 | 4-Stroke | 2001–2005 | 63V-W0078-03-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct OEM Replacement
- Warranty
- 1 Year (Aftermarket)
- Other Technical Attributes
- Manufactured to OEM specifications
What’s in the Box
- 1 x Insert, Cartridge (63V-44322-00-00)
- 1 x Outer Plate, Cartridge (63V-44323-00-00)
- 1 x Impeller (63V-44352-01-00)
- 1 x Water Seal 2 (647-44366-00-00)
- 1 x Key, Woodruff (664-44338-00-00)
- 4 x Bolt, Hexagon (97080-08045-00)
- 1 x O-Ring (93210-44704)
Installation Notes
- Disconnect the spark plug leads and shift the outboard into neutral.
- Remove the bolts securing the lower unit (gearcase) to the engine's upper section.
- Carefully lower and separate the gearcase to expose the driveshaft and water pump assembly.
- Remove the water pump housing bolts and lift the housing to access the impeller.
- Take note of the component order. Remove the old impeller, gaskets, plates, and Woodruff key.
- Clean all surfaces of debris and old gasket material.
- Install the new components from the kit in the reverse order of removal. Lightly grease the new impeller and housing interior.
- Align the Woodruff key and slide the new impeller onto the driveshaft, turning the shaft clockwise to seat the vanes.
- Reinstall the housing, ensuring all seals are correctly seated. Torque bolts to manufacturer specifications.
- Reattach the lower unit, ensuring the driveshaft, shift shaft, and water tube are properly aligned.
- Once fully assembled, test the engine using a water source (flushing attachment or in the water) to verify strong water flow from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit will fit my Yamaha outboard?
The surest way is to match your engine's model and year to our Engine & Model Compatibility table. You can also cross-reference your existing water pump kit's part number with those in our Part Number Matrix. If you're uncertain, please contact us before ordering.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or an engine alarm if your model is equipped with one. Visible signs on the old impeller include cracked, brittle, or missing vanes.
How often should I replace the water pump impeller?
As a preventative maintenance measure, it is recommended to replace the impeller and other kit components every 1 to 2 years, or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
What do the different Yamaha part numbers (63V-W0078-XX-00) mean?
These numbers represent supersessions. Yamaha periodically updates part numbers for minor revisions or logistical reasons. All the 63V-W0078-XX-00 versions listed are functionally identical and fully interchangeable for the compatible models.
Is the Woodruff key important to replace?
Yes, absolutely. The Woodruff key is a small but critical component that locks the impeller to the driveshaft, ensuring it spins with the shaft. Always use the new key provided in the kit to prevent slippage and potential engine damage.
Do I need any special sealants for this job?
While the kit is designed to seal correctly on its own, some mechanics apply a light, non-hardening sealant to the gaskets as a best practice. However, avoid using heavy sealants like silicone RTV, which can clog water passages if used improperly.
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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