Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-00-00, 63D-W0078-01-00)
Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-00-00, 63D-W0078-01-00) 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 40-60 HP (Replaces 63D...
Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-00-00, 63D-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Repair Kit – Fits Yamaha 40-60 HP (Replaces 63D-W0078-00-00, 63D-W0078-01-00) is designed for Yamaha 40 HP to 60 HP outboard motors (2-stroke and 4-stroke) manufactured from 1995 to the present. It contains all necessary components to restore your engine's cooling system to factory-fresh performance.
It serves as a direct replacement for Yamaha OEM parts 63D-W0078-00-00 and 63D-W0078-01-00, as well as aftermarket references Sierra 18-3434, 18-3415, GHmarine 63DW0078, and GlückMarine 63DW0078.
- Engineered for direct-fit installation.
- Features durable stainless steel housing components and a high-performance neoprene impeller.
- Includes a non-asbestos gasket for a reliable, long-lasting seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Yamaha | 63D-W0078-00-00 |
| Yamaha | 63D-W0078-01-00 |
| Sierra | 18-3434 |
| Sierra | 18-3415 |
| GHmarine | 63DW0078 |
| GlückMarine | 63DW0078 |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
Fitment for Yamaha outboards includes C-40, CV-40, F-50, F-60, P-40, P-50, T-50, and standard 40, 50, and 60 HP models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | C-40 | 40 | 4-Stroke | 1998 & Up | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | CV-40 | 40 | 4-Stroke | 1998 & Up | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | 40 | 40 | 2-Stroke | 1995–2005 | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | P-40 | 40 | 2-Stroke | 1995–2005 | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | F-50 | 50 | 4-Stroke | 1995 & Up | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | 50 | 50 | 2-Stroke | 1995 & Up | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | T-50 | 50 | 2-Stroke | 1996–1997 | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | P-50 | 50 | 2-Stroke | 1995–1996 | 63D-W0078-00-00/63D-W0078-01-00 |
| Yamaha | F-60 | 60 | 4-Stroke | 2002 & Up | 63D-W0078-00-00/63D-W0078-01-00 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct replacement
- Housing Material
- Stainless steel components with neoprene impeller
- Housing Color
- Silver/black
- Weight
- 227g (8 oz)
- Other Technical Attributes
- Non-asbestos gasket
What’s in the Box
- 1 x Neoprene Impeller (6H3-44352-00)
- 1 x Wear Plate (63D-44323-00)
- 1 x Insert Cup (63D-44322-00)
- 1 x Gasket (63D-44316-00)
- 1 x O-Ring (93210-59MG7)
- 1 x Woodruff Key (90280-03024)
- 1 x Cover, Water Pump Housing (63D-44312-00)
- 1 x Grommet (663-44366-00)
- 4 x Installation bolt and washer (90119-08M15)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Remove the lower unit (gearcase) by unbolting it from the engine's midsection. You may need to disconnect the speedometer tube and shift linkage.
- Place the lower unit on a workbench and remove the bolts securing the water pump housing cover.
- Slide the housing up and off the driveshaft, exposing the impeller.
- Remove the old impeller, Woodruff key, wear plate, insert cup, and gaskets. Clean all mating surfaces thoroughly.
- Install the new components from the kit in reverse order. Lightly grease the new impeller and insert cup interior.
- Ensure the impeller blades are oriented correctly (in the direction of driveshaft rotation).
- Torque the housing bolts to the manufacturer's specification.
- Reinstall the lower unit, ensuring all linkages are connected correctly.
- Start the engine in a water-filled test tank or with a water flusher attached and confirm a steady stream of water from the tell-tale port.
Troubleshooting & FAQ
How often should I replace my water pump impeller?
For optimal reliability, we recommend replacing the impeller and gaskets every 100-200 operating hours or annually, whichever comes first. This interval can be shorter in saltwater or high-sediment environments.
What are the signs of a failing water pump?
Common symptoms include a weak or non-existent water stream from the "tell-tale" port, engine overheating alarms, and reduced engine performance. Visible damage to the old impeller, like cracked or missing blades, confirms failure.
The compatibility chart says "1995 & Up." How do I confirm it fits my specific model year?
The "and Up" designation means this part fits all models produced from that year forward within that series. This kit is designed for the specified Yamaha 40-60 HP range from 1995 to the latest models, as the OEM part number has not changed for this assembly.
What is the difference between this full kit and just replacing the impeller?
This is a complete repair kit. Over time, the wear plate, insert cup, and housing can become scored or warped from heat and debris, reducing pumping efficiency even with a new impeller. Replacing all components at once ensures a proper seal and restores the pump to its original performance and longevity.
Can I reuse my old water pump housing or bolts?
While you can sometimes reuse the main housing cover if it is not corroded or warped, this kit includes essential wear items like the insert cup and wear plate. We strongly recommend using the new bolts and washers supplied, as old bolts can stretch or corrode, leading to improper torque and potential leaks.
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. 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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