Water Pump Impeller Repair Kit – Fits Yamaha 6-30 HP Outboards (Replaces 63V-W0078-00/01, Sierra 18-3412/18-3433)
Water Pump Impeller Repair Kit – Fits Yamaha 6-30 HP Outboards (Replaces 63V-W0078-00/01, Sierra 18-3412/18-3433) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller Repair Kit – Fits Yamaha 6-30 HP Outboards (Rep...
Water Pump Impeller Repair Kit – Fits Yamaha 6-30 HP Outboards (Replaces 63V-W0078-00/01, Sierra 18-3412/18-3433) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit – Fits Yamaha 6-30 HP Outboards is a complete assembly designed to restore your engine's cooling system performance. It is compatible with a wide range of Yamaha 2-stroke models (9.9–30 HP, from 1996–2013) and 4-stroke models (F6–F15, from 2001–2013), ensuring reliable operation for various outboards.
The kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Yamaha 63V-W0078-00/01/02/03/04, Sierra 18-3412/18-3433, and several GLM references. All components are engineered to meet or exceed OEM specifications for fit and function.
- Provides a direct-fit installation with no modifications required.
- Includes a durable nylon housing, stainless steel wear plate, and neoprene impeller for longevity.
- Comes with all necessary gaskets, plates, and hardware for a complete overhaul.
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 | 12087 |
| GLM | 12033 |
| GLM | 12865 |
| GLM | 12517 |
| GLM | 12066 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is verified for the following Yamaha 2-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9 & 15 | 9.9, 15 | 2-Stroke | 1996–2013 | 63V-W0078-00-00 | |
| Yamaha | 20, 25, 30 | 20, 25, 30 | 2-Stroke | Various | 63V-W0078-00-00 | Check model compatibility |
This kit is verified for the following Yamaha 4-stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F6 | 6 | 4-Stroke | 2001–2008 | 63V-W0078-00-00 | |
| Yamaha | F8, T8 | 8 | 4-Stroke | 2001–2019 | 63V-W0078-00-00 | |
| Yamaha | F9.9, F9.9-2 | 9.9 | 4-Stroke | 2007–2013 | 63V-W0078-00-00 | |
| Yamaha | FT9.9, T9.9, T9.9-2 | 9.9 | 4-Stroke | 2005–2013 | 63V-W0078-00-00 | |
| Yamaha | F15 | 15 | 4-Stroke | 2001–2013 | 63V-W0078-00-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit with Housing
- Installation
- Direct replacement
- Housing Material
- Nylon
- Housing Color
- Black
- Other Technical Attributes
- Includes stainless steel wear plate & liner, neoprene water pump impeller
What’s in the Box
- 1 x Pump Housing (63V-44301-00)
- 1 x Water Pump Impeller (63V-44352-01-00)
- 1 x Cartridge Insert (63V-44322-00-00)
- 1 x Cartridge Outer Plate (63V-44323-00-00)
- 1 x Water Seal Damper (647-44366-00-00)
- 1 x Woodruff Key (63V-44338-00-00)
- 4 x Bolts (97080-08045-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Place the gear shifter in the neutral position.
- Drain the lower unit gear lube.
- Remove the bolts securing the lower unit to the engine and carefully separate it.
- Locate and unbolt the water pump housing.
- Remove the old impeller, gaskets, plates, and seals. Clean all mating surfaces thoroughly.
- Install the new components from the kit in the reverse order of removal. Ensure the impeller vanes are oriented correctly.
- Reassemble the water pump housing and torque bolts to manufacturer specifications.
- Reattach the lower unit, refill with fresh gear lube, and reconnect the battery.
- Start the engine in water and verify a strong, steady stream from the water pump tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my specific Yamaha outboard?
First, check your engine's model, horsepower, and year against the compatibility tables on this page. Second, cross-reference your existing part numbers with our Part Number Matrix. Finally, visually compare your old parts to the product images to ensure a match.
What are the signs of a failing water pump impeller?
Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alerts or alarms, and a reduction in engine performance. Upon inspection, a worn impeller may have cracked, brittle, or missing vanes.
How often should the water pump impeller be replaced?
As a critical preventative maintenance item, most marine mechanics and engine manufacturers recommend replacing the impeller every 100 operating hours or annually, whichever comes first.
Does this kit include the housing and all necessary seals?
Yes, this is a complete repair kit. It includes the pump housing, impeller, cartridge insert, outer plate, water seal damper, woodruff key, and all four mounting bolts for a comprehensive service.
Why does the title say 6-30 HP but the tables are more specific?
The kit covers a wide range of horsepower applications, but fitment is specific to certain engine models and years. For example, it fits 6 HP 4-stroke models and up to 30 HP 2-stroke models, but not all engines in between. Always refer to the detailed compatibility tables to confirm your exact model is listed.
What makes this different from an original Yamaha OEM part?
This is an aftermarket replacement part, not OEM. It is engineered to meet or exceed original equipment specifications using comparable materials. The primary differences are the brand and the price, offering a cost-effective solution without compromising on quality or performance.
What is the difference between OEM and Aftermarket parts?
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.
How fast is shipping and what does it cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
This product is 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 for unused items 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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