Water Pump Impeller Kit with Housing – Fits Yamaha 40-60 HP (Replaces 63D-W0078-01-00, Sierra 18-3415)
Water Pump Impeller Kit with Housing – Fits Yamaha 40-60 HP (Replaces 63D-W0078-01-00, Sierra 18-3415) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Kit with Housing – Fits Yamaha 40-60 HP (Replac...
Water Pump Impeller Kit with Housing – Fits Yamaha 40-60 HP (Replaces 63D-W0078-01-00, Sierra 18-3415) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit with Housing is a complete aftermarket solution designed for Yamaha 2-stroke (40-50 HP, 1995–2009) and 4-stroke (40-60 HP, 1995–2009) outboard engines. It provides everything necessary for a full water pump service to restore cooling performance and prevent overheating.
It serves as a direct replacement for Yamaha OEM part numbers 63D-W0078-01-00 and 63D-W0078-03-00, as well as Sierra aftermarket parts 18-3415 and 18-3434.
- Complete kit includes the pump housing, impeller, wear plate, and all required gaskets, seals, and bolts.
- Engineered for installation in the lower unit of compatible outboard models.
- Features a durable neoprene impeller and a high-strength Nylon PA66 plastic housing for reliable, long-term service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 63D-W0078-01-00 |
| Yamaha | 63D-W0078-03-00 |
| Sierra | 18-3415 |
| Sierra | 18-3434 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | C/CV-40 | 40 | 2-Stroke | 1998 & Up | 63D-W0078-01-00 | |
| Yamaha | 40/P-40 | 40 | 2-Stroke | 1995–2005 | 63D-W0078-01-00 | |
| Yamaha | F40 | 40 | 4-Stroke | 1999 | 63D-W0078-01-00 | |
| Yamaha | F50 | 50 | 4-Stroke | 1995–2009 | 63D-W0078-01-00 | |
| Yamaha | 50 | 50 | 2-Stroke | 1995 & Up | 63D-W0078-01-00 | |
| Yamaha | T-50 | 50 | 2-Stroke | 1996–1997 | 63D-W0078-01-00 | |
| Yamaha | P50 | 50 | 2-Stroke | 1995–1996 | 63D-W0078-01-00 | |
| Yamaha | C50 | 50 | 2-Stroke | 1998–2001 | 63D-W0078-01-00 | |
| Yamaha | F60 | 60 | 4-Stroke | 2002–2009 | 63D-W0078-01-00 |
Technical Specs
- Product Type
- Water Pump Impeller Kit with Housing
- Installation
- Lower Unit
- Housing Material
- Nylon PA66 Plastic
- Housing Color
- Black
- Impeller Material
- Neoprene Rubber
- Weight
- 320 g (11.3 oz)
- Warranty
- 1 Year
- Other Attributes
- Complete repair kit with housing
What's in the Box
- 1 x Water Pump Housing (63D-44311-00-00)
- 1 x Neoprene Impeller (6H3-44352)
- 1 x Insert Cup (63D-44322-00-00)
- 1 x Wear Plate (63D-44323-00)
- 1 x Pump Case Gasket (63D-44316-00-00)
- 4 x Bolts (90119-08M15-00)
- 1 x Impeller Key (90280-03024-00)
- 1 x Water Seal Damper (18-1830)
- 1 x Cover, Water Pump Housing (63D-44312)
- 1 x O-Ring (93210-59MG7)
Installation Notes
- Disconnect the battery and remove the engine cover. Place the outboard in neutral.
- Drain the gearcase oil by removing the upper and lower drain screws.
- Remove the bolts securing the lower unit (gearcase) to the midsection and carefully lower it.
- Unbolt the existing water pump housing to access the impeller and other components.
- Thoroughly clean all mating surfaces, removing any old gasket material or corrosion.
- Install the new gasket, wear plate, impeller key, impeller, and insert cup. Ensure the impeller vanes are oriented correctly.
- Position the new housing and tighten the bolts to the manufacturer's specified torque.
- Reinstall the lower unit, ensuring the driveshaft and shift shaft are properly aligned.
- Refill the gearcase with the correct type and amount of oil.
- Run the engine with a water supply and verify that a steady stream of water exits the tell-tale port.
Troubleshooting & FAQ
How do I find my engine's model and year?
Your Yamaha engine's model and year are typically found on a identification plate located on the transom clamp bracket. This information is crucial for confirming part compatibility.
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 during inspection.
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