Water Pump Repair Kit Without Housing – Fits Yamaha 9.9/15 HP 2-Stroke (Replaces 63V-W0078-01-00)
Water Pump Repair Kit Without Housing – Fits Yamaha 9.9/15 HP 2-Stroke (Replaces 63V-W0078-01-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit Without Housing – Fits Yamaha 9.9/15 HP 2-Str...
Water Pump Repair Kit Without Housing – Fits Yamaha 9.9/15 HP 2-Stroke (Replaces 63V-W0078-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Repair Kit Without Housing is designed for selected Yamaha 9.9 HP and 15 HP 2-stroke outboard applications. It is a service kit for the water pump assembly and replaces Yamaha OEM reference 63V-W0078-01-00 where that number is specified for the engine.
The kit is supplied without the water pump housing. Its documented application range includes selected Yamaha 9.9 HP and 15 HP 2-stroke models from the mid-1990s through 2010, with exact fitment depending on model, year, and engine configuration. Confirm the complete engine model and existing part number before ordering.
- Aftermarket water pump repair kit for selected Yamaha outboards.
- Supplied without the water pump housing.
- Includes service components for renewing the impeller and related water pump parts.
- Suitable for routine cooling-system maintenance in fresh or salt water when correctly installed and rinsed after use.
Part Number Matrix
The following references are documented as related OEM or aftermarket references. Number relationships can vary by engine model and kit configuration, so use the exact engine application rather than the number alone.
| Brand | Part Number | Reference Type |
|---|---|---|
| Yamaha | 63V-W0078-01-00 | OEM replacement reference |
| Yamaha | 63V-44352-00-00 | Impeller reference used in documented applications |
| Yamaha | 63V-44352-01-00 | Related impeller reference; verify application |
| Sierra | 18-3412 | Aftermarket water pump kit without housing |
| Sierra | 18-3433 | Different configuration: water pump kit with housing |
Engine & Model Compatibility
Documented catalog applications identify the replacement reference with selected Yamaha 9.9 HP and 15 HP 2-stroke outboards. The table below summarizes the supported application scope found in the available catalogs; it is not a universal fitment list for every Yamaha engine carrying the same horsepower rating.
| Brand | Model Family | Rated HP | Stroke | Documented Years | OEM Reference | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9MSH / related 9.9MSH variants | 9.9 | 2-Stroke | 2001–2010 catalog applications | 63V-W0078-01-00 | Confirm the complete model code and year. |
| Yamaha | 15MSH / related 15MSH variants | 15 | 2-Stroke | 2001–2010 catalog applications | 63V-W0078-01-00 | Confirm the complete model code and year. |
| Yamaha | Selected 9.9 HP models | 9.9 | 2-Stroke | 1996–2004 documented catalog range | 63V-W0078-01-00 | Application varies by model and year. |
| Yamaha | Selected 15 HP models | 15 | 2-Stroke | 1996–2004 documented catalog range | 63V-W0078-01-00 | Application varies by model and year. |
Not confirmed by the available evidence: Yamaha 4-stroke F9.9 or F15 applications, 2024 model-year coverage, or universal compatibility with all 9.9/15 HP engines. Do not use this kit for those applications without matching the engine-specific parts diagram or OEM number.
Technical Specs
- Product Type
- Water pump repair kit without housing
- Application
- Selected Yamaha 9.9 HP and 15 HP 2-stroke outboards
- Installation
- Replacement service part; professional installation is recommended
- Housing Included
- No
- Primary OEM Reference
- 63V-W0078-01-00
- Water Use
- Suitable for freshwater and saltwater service when maintained correctly
What’s in the Box
This is the without-housing configuration. The kit does not include a water pump housing.
- Water pump impeller
- Wear plate
- Impeller key
- Insert cup
- Water seal and related service hardware, as supplied for the applicable kit configuration
Component appearance and exact hardware can vary by production batch. Compare the supplied components with the parts diagram for your engine before installation.
Installation Notes
- Disconnect the battery or ignition system, remove the spark plug leads, and place the outboard in neutral.
- Remove the propeller if required for safe access, then remove the lower-unit mounting hardware.
- Carefully detach the lower unit while supporting it and preserving the shift linkage and driveshaft alignment.
- Remove the water pump cover and expose the existing impeller, wear plate, key, and related components.
- Record the orientation of the old impeller before removal, then remove the old key and impeller.
- Clean the mating surfaces and inspect the pump housing, driveshaft, water passages, and fasteners. This kit does not replace a damaged housing.
- Install the supplied service components using the correct sequence for the engine model. Lubricate the impeller with clean water or a lubricant approved for the impeller material.
- Orient the impeller vanes in the correct direction while lowering the pump cover; follow the engine manufacturer’s service procedure.
- Reinstall the pump cover and lower unit, tightening fasteners to the manufacturer’s specifications.
- Run the engine in a safe water supply and confirm a strong tell-tale stream and normal cooling operation before returning the boat to service.
Troubleshooting & FAQ
How do I confirm this kit fits my Yamaha engine?
Match the complete Yamaha model code, horsepower, stroke type, and model year to the engine parts diagram. Also compare the existing water pump kit reference with 63V-W0078-01-00. Horsepower alone is not sufficient because similar 9.9 HP and 15 HP engines can use different water pump components.
Does this kit include the water pump housing?
No. This listing is for the water pump repair kit without housing. A housing-inclusive kit is a different configuration and should not be substituted by title or horsepower alone.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or missing tell-tale stream, overheating warnings, reduced cooling-water flow, or cracked, hardened, or missing impeller vanes during inspection.
How often should I replace the impeller?
Inspect the impeller according to the engine manufacturer’s maintenance schedule. Replace it sooner when the engine has been operated in sandy, silty, or heavily contaminated water, or whenever the vanes show wear or deformation.
Is this kit difficult to install?
Installation requires removal of the lower unit and correct reassembly of the water pump. If you are not familiar with outboard service procedures, use a qualified marine technician.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for applications that use the listed OEM reference. Yamaha and the listed aftermarket brands are mentioned only to identify compatibility references.
How should I verify the replacement before installation?
Compare the new impeller, wear plate, key, insert cup, seal, and other supplied parts with the removed components and the engine-specific parts diagram. Do not install the kit if the dimensions, keyway, or component arrangement do not match.
Safety & Important Info
- Verify the complete engine model, year, stroke type, and OEM reference before ordering.
- This kit does not include the water pump housing.
- Do not assume fitment for Yamaha 4-stroke engines or later model years without engine-specific confirmation.
- Inspect the housing and all mating surfaces during installation; a worn or damaged housing can cause poor water flow even with a new impeller.
- Professional installation is recommended for safety and correct cooling-system operation.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world conditions.
- Fast Global Fulfillment — Standard and expedited delivery options are shown at checkout where available.
- Manufacturer-Direct Value — Fair pricing with attention to component consistency and application accuracy.
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