Water Pump Impeller Kit – Fits Yamaha 40/50/60HP 2-Stroke & 4-Stroke (Replaces 63D-W0078-01-00)
Water Pump Impeller Kit – Fits Yamaha 40/50/60HP 2-Stroke & 4-Stroke (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
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Water Pump Impeller Kit – Fits Yamaha 40/50/60HP 2-Stroke & 4-S...
Water Pump Impeller Kit – Fits Yamaha 40/50/60HP 2-Stroke & 4-Stroke (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 – Fits Yamaha 40/50/60HP 2-Stroke & 4-Stroke (Replaces 63D-W0078-01-00) includes all necessary components to restore your engine’s cooling system. It is designed for Yamaha outboard engines, fitting both 2-stroke models (40HP, 50HP from 1994–2005) and 4-stroke models (F40, F50, F60 from 1996 and newer).
This kit serves as a direct cross-reference for Yamaha part numbers 63D-W0078-01-00, 63D-W0078-03-00, 63D-W0078-02-00, and 63D-W0078-00-00, along with Sierra equivalents 18-3415 and 18-3434.
- Designed for direct-fit installation with no modifications needed.
- Includes housing, impeller, gaskets, and hardware for a complete overhaul.
- Engineered for reliable performance in demanding marine conditions.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 63D-W0078-01-00 |
| Yamaha | 63D-W0078-03-00 |
| Yamaha | 63D-W0078-02-00 |
| Yamaha | 63D-W0078-00-00 |
| Sierra | 18-3415 |
| Sierra | 18-3434 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha owners, please verify your specific model code (e.g., F50TLR) and manufacturing year against the compatible models listed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40/50 | 40-50 | 2-Stroke | 1994–2005 | 63D-W0078-01-00 | |
| Yamaha | F40A, AE, AEL, AMH | 40 | 4-Stroke | 1999–2002 | 63D-W0078-01-00 | |
| Yamaha | F40B | 40 | 4-Stroke | 2006–2015 | 63D-W0078-01-00 | |
| Yamaha | F40CET | 40 | 4-Stroke | 2002 | 63D-W0078-01-00 | |
| Yamaha | F40D, DE, HE | 40 | 4-Stroke | 2006–2015 | 63D-W0078-01-00 | |
| Yamaha | F50A, AE, TJR | 50 | 4-Stroke | 1997–2007 | 63D-W0078-01-00 | |
| Yamaha | F50DETL | 50 | 4-Stroke | 1995–2010 | 63D-W0078-01-00 | |
| Yamaha | F50F, FE, TR, TL | 50 | 4-Stroke | 2005–2012 | 63D-W0078-01-00 | |
| Yamaha | F50HED | 50 | 4-Stroke | 2013–2015 | 63D-W0078-01-00 | |
| Yamaha | F60A, AE, TL, TJR | 60 | 4-Stroke | 2002–2012 | 63D-W0078-01-00 | |
| Yamaha | F60B, FET | 60 | 4-Stroke | 2013–2015 | 63D-W0078-01-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct Replacement
- Other Technical Attributes
- Includes housing and all necessary components for complete water pump rebuild
What’s in the Box
- 1 x Cartridge Insert (63D-44322-00-00)
- 1 x Impeller (6H3-44352-00-00)
- 1 x Water Pump Housing Cover (63D-44312-00-00)
- 1 x Cartridge Outer Plate (63D-44323-00-00)
- 1 x O-Ring (93210-59MG7-00)
- 1 x Water Pump Gasket (63D-44316-00-00)
- 4 x Bolts With Washers (90119-08M15-00)
- 1 x Water Seal Damper 2 (663-44366-00-00)
- 1 x Woodruff Key (90280-03024-00)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the gearcase oil from the lower unit.
- Remove the bolts securing the lower unit and detach it from the engine.
- Unbolt and remove the old water pump housing assembly.
- Carefully note the orientation of all old parts before removal.
- Clean the mounting surfaces, ensuring they are free of old gasket material and corrosion.
- Install the new impeller, key, gaskets, and plates as provided in the kit. Lubricate the new impeller lightly.
- Assemble and install the new water pump housing, ensuring all bolts are torqued to manufacturer specifications.
- Reinstall the lower unit, refill the gearcase oil, and reconnect the battery.
- Start the engine and verify water is exiting the tell-tale port, confirming correct pump operation.
Troubleshooting & FAQ
How do I know if my water pump impeller is failing?
Common signs include a weak or non-existent water stream from the tell-tale (peephole), engine overheating alarms, or a noticeable decrease in engine performance. A visual inspection of the impeller may reveal cracked, brittle, or missing vanes.
How often should the water pump kit be replaced?
For preventative maintenance, it is recommended to inspect the impeller annually and replace the entire water pump kit every 2-3 years or every 200-300 hours of use, whichever comes first. This interval may be shorter in saltwater or high-sediment environments.
Will this fit my specific Yamaha F50TLR model from 2006?
Yes, based on the compatibility chart, the F50TL model is covered from 2005 to 2012. You can confirm by matching your engine's OEM part number requirement to 63D-W0078-01-00.
What is the purpose of the Woodruff key?
The Woodruff key is a small, semi-circular piece of metal that locks the impeller to the driveshaft, ensuring they rotate together. It is critical for the pump to function; do not reuse the old key.
Is this an OEM Yamaha part?
This listing is for a high-quality aftermarket replacement, not an original equipment manufacturer (OEM) part. It is built to meet or exceed OEM-level specifications using comparable materials and manufactured in an ISO 9002 certified facility with rigorous batch inspections.
What are your shipping speeds and costs?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free. If available for your location, expedited shipping options and costs will be presented at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their 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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