Water Pump Impeller Kit – Fits Yamaha 40-60HP (Replaces 63D-W0078-01, 18-3415)
Water Pump Impeller Kit – Fits Yamaha 40-60HP (Replaces 63D-W0078-01, 18-3415) 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 40-60HP (Replaces 63D-W0078-0...
Water Pump Impeller Kit – Fits Yamaha 40-60HP (Replaces 63D-W0078-01, 18-3415) is backordered and will ship as soon as it is back in stock.
Product Details
This complete Water Pump Impeller Kit provides everything needed for routine lower unit maintenance on a wide range of Yamaha 40, 50, and 60 HP outboard engines. It fits select 2-stroke models (1994–2005) and 4-stroke models including the F40, F50, and F60 series (1997+).
It serves as a direct aftermarket replacement for multiple Yamaha and Sierra part numbers, including the primary OEM reference 63D-W0078-01.
- Installs in the lower unit/gearcase assembly.
- Manufactured to OEM specifications in an ISO9002 certified factory.
- Includes impeller, housing, wear plate, gaskets, and all necessary hardware.
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-W0078-03-00 |
| Yamaha | 63D-W0078-02-00 |
| Yamaha | 63D-W0078-00-00 |
| Yamaha | 6H4-W0078-00 |
| Yamaha | 6H4-W0078-01-00 |
| Yamaha | 6H4-W0078-A0-00 |
| Sierra | 18-3415 |
| Sierra | 18-3434 |
| GLM | 12276 |
Engine & Model Compatibility
Confirm your engine model and year in the table below. Matching the full model string (e.g., F50TLRB) is the best way to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40EJRV/40EJRW/40EJRX | 40 | 2-Stroke | 1997–1999 | 63D-W0078-01 | |
| Yamaha | 40ELRV/40ELRW | 40 | 2-Stroke | 1997–1998 | 63D-W0078-01 | |
| Yamaha | 40ESRV/40ESRW/40ESRX | 40 | 2-Stroke | 1997–1999 | 63D-W0078-01 | |
| Yamaha | 40MJHV/40MJHW/40MJHX/40MJHY/40MJHZ | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01 | |
| Yamaha | 40MLHV/40MLHW/40MLHX/40MLHY/40MLHZ | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01 | |
| Yamaha | 40MSHV/40MSHW/40MSHX | 40 | 2-Stroke | 1997–1999 | 63D-W0078-01 | |
| Yamaha | 40TLHV | 40 | 2-Stroke | 1997 | 63D-W0078-01 | |
| Yamaha | 40TLR | 40 | 2-Stroke | 2004–2005 | 63D-W0078-01 | |
| Yamaha | 40TLRA/40TLRB/40TLRC/40TLRD | 40 | 2-Stroke | 2002–2005 | 63D-W0078-01 | |
| Yamaha | 40TLRNC | 40 | 2-Stroke | 2004 | 63D-W0078-01 | |
| Yamaha | 40TLRV/40TLRW/40TLRX/40TLRY/40TLRZ | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01 | |
| Yamaha | 50EJRV/50EJRW/50EJRX/50EJRY/50EJRZ | 50 | 2-Stroke | 1997–2001 | 63D-W0078-01 | |
| Yamaha | 50ELRV/50ELRW | 50 | 2-Stroke | 1997–1998 | 63D-W0078-01 | |
| Yamaha | 50TLHV | 50 | 2-Stroke | 1997 | 63D-W0078-01 | |
| Yamaha | 50TLR | 50 | 2-Stroke | 2004–2009 | 63D-W0078-01 | |
| Yamaha | 50TLRA/50TLRB/50TLRC/50TLRD | 50 | 2-Stroke | 2002–2005 | 63D-W0078-01 | |
| Yamaha | 50TLRNC | 50 | 2-Stroke | 2004 | 63D-W0078-01 | |
| Yamaha | 50TLRV/50TLRZ | 50 | 2-Stroke | 1997, 2001 | 63D-W0078-01 | |
| Yamaha | C40TLRA/C40TLRB | 40 | 2-Stroke | 2002–2003 | 63D-W0078-01 | |
| Yamaha | C40TLRV/C40TLRW/C40TLRX/C40TLRY/C40TLRZ | 40 | 2-Stroke | 1997–2001 | 63D-W0078-01 | |
| Yamaha | C50TLRW/C50TLRX/C50TLRY/C50TLRZ | 50 | 2-Stroke | 1998–2001 | 63D-W0078-01 | |
| Yamaha | P40TLHW/P40TLRW | 40 | 2-Stroke | 1998 | 63D-W0078-01 | |
| Yamaha | T50TLRC | 50 | 2-Stroke | 2004 | 63D-W0078-01 | |
| Yamaha | T50TLRV | 50 | 2-Stroke | 1997 | 63D-W0078-01 | |
| Yamaha | F40TLRX | 40 | 4-Stroke | 1999 | 63D-W0078-01 | |
| Yamaha | F50LA | 50 | 4-Stroke | 2012–present | 63D-W0078-01 | |
| Yamaha | F50LB | 50 | 4-Stroke | 2013–2016 | 63D-W0078-01 | |
| Yamaha | F50TLHV | 50 | 4-Stroke | 1997 | 63D-W0078-01 | |
| Yamaha | F50TLR | 50 | 4-Stroke | 2004–2011 | 63D-W0078-01 | |
| Yamaha | F50TLRA/F50TLRB/F50TLRC/F50TLRD | 50 | 4-Stroke | 2002–2005 | 63D-W0078-01 | |
| Yamaha | F50TLRV/F50TLRW/F50TLRX/F50TLRY/F50TLRZ | 50 | 4-Stroke | 1997–2001 | 63D-W0078-01 | |
| Yamaha | F60JB | 60 | 4-Stroke | 2013–2016 | 63D-W0078-01 | |
| Yamaha | F60LA | 60 | 4-Stroke | 2012 | 63D-W0078-01 | |
| Yamaha | F60LB | 60 | 4-Stroke | 2013–2016 | 63D-W0078-01 | |
| Yamaha | F60TJR | 60 | 4-Stroke | 2004–2007 | 63D-W0078-01 | |
| Yamaha | F60TJRB/F60TJRC/F60TJRD | 60 | 4-Stroke | 2003–2005 | 63D-W0078-01 | |
| Yamaha | F60TLR | 60 | 4-Stroke | 2004–2011 | 63D-W0078-01 | |
| Yamaha | F60TLRA/F60TLRB/F60TLRC/F60TLRD | 60 | 4-Stroke | 2002–2005 | 63D-W0078-01 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Lower Unit/Gearcase
- Other Technical Attributes
- Manufactured to OEM specifications in ISO9002 certified factory
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 Bolt with Washer (90119-08M15-00)
- 1 x Water Seal Damper (663-44366-00-00)
- 1 x Woodruff Key (90280-03024-00)
Installation Notes
- Disconnect the spark plug leads and shift the outboard into neutral.
- Place a drain pan under the lower unit and remove the gearcase oil drain screw to empty the oil.
- Remove the bolts securing the lower unit (gearcase) to the engine's upper casing.
- Gently lower the gearcase away from the engine, watching for the shift shaft and driveshaft to disengage.
- Locate the water pump assembly on top of the gearcase and remove the bolts securing its housing.
- Lift off the pump housing and slide the old impeller, wear plate, and gaskets off the driveshaft. Note their orientation.
- Clean the driveshaft and housing mating surfaces thoroughly.
- Install the new components from the kit in reverse order: gasket, plate, woodruff key, and then the new impeller. Lubricate the impeller and housing interior with a marine-safe grease.
- Slide the new housing over the impeller while turning the driveshaft clockwise to seat the vanes correctly.
- Fasten the new housing with the new bolts and torque to the manufacturer's specification.
- Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align properly.
- Reinstall the lower unit bolts, refill the gearcase with fresh oil, and reconnect the spark plug leads. Test on a water supply.
Troubleshooting & FAQ
How do I confirm this kit fits my engine?
Check your engine's model and year against the compatibility table. The most reliable way is to match your engine's full model number (e.g., F50TLRB) to the list. If unsure, contact us with your engine details before ordering.
What are signs of a failing water pump impeller?
Key symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, and in severe cases, steam from the exhaust. A damaged impeller can cause rapid and severe engine damage.
How often should I replace the impeller?
For preventative maintenance, it is recommended to replace the water pump impeller and gaskets every 1 to 2 years, or every 100-200 hours of operation. Service intervals depend heavily on usage conditions (e.g., saltwater vs. freshwater, sandy/silty water).
Does this kit include the pump housing?
Yes, this is a complete kit that includes the water pump housing cover, impeller, cartridge insert and outer plate, gaskets, and all necessary bolts and hardware for a full replacement.
Can I install this kit myself?
While many boat owners perform this service themselves, it requires mechanical skill and proper tools. For safety and correct installation, we recommend consulting a service manual for your specific engine or having a qualified marine mechanic perform the work.
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 ordering. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.
- Professional installation is highly recommended for safety and performance. Improper installation can lead to engine damage.
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, with expedited options available.
- Manufacturer-Direct Value — Fair pricing on reliable components without compromising on materials or quality control.
Payment & Security
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