Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Replaces 682-W0078-A1-00
Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Replaces 682-W0078-A1-00 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Rep...
Water Pump Impeller Repair Kit for Yamaha 9.9/15 HP Outboards – Replaces 682-W0078-A1-00 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller repair kit is intended for selected Yamaha 9.9 HP and 15 HP outboard applications using the Yamaha reference 682-W0078-A1-00. Cataloged applications include specific Yamaha 9.9 and 15 HP models, including selected 1984–1985 2-stroke models and selected T9.9 applications. Always verify the complete model code, year, stroke, and serial-number range before ordering.
The part reference is associated with Yamaha water-pump repair-kit applications. It is an aftermarket replacement and is not manufactured by Yamaha. The kit is supplied for water-pump service; it does not include a complete lower unit or an assembled water-pump system.
- Replacement water-pump service component for compatible Yamaha outboards.
- Designed to restore water-pump impeller service during routine cooling-system maintenance.
- Use the exact engine model and year to confirm fitment; horsepower alone is not sufficient.
Part Number References
The following manufacturer reference is used to identify the compatible water-pump repair-kit application.
| Brand | Reference Number | Reference Type |
|---|---|---|
| Yamaha | 682-W0078-A1-00 | Manufacturer reference |
| Yamaha | 682-W0078-01-00 | Related water-pump repair-kit reference; verify against the engine model |
Engine & Model Compatibility
Fitment depends on the complete model designation and production year. The catalog evidence identifies the following application families for this reference. This is not a universal fit for every Yamaha 9.9 or 15 HP outboard.
| Brand | Model or Application | Rated HP | Stroke | Documented Year or Range | Reference |
|---|---|---|---|---|---|
| Yamaha | 15ELN, 15ESK, 15ESN, 15LK, 15LN, 15SK, 15SN | 15 | 2-Stroke | 1984–1985 catalog applications | 682-W0078-01-00 |
| Yamaha | 9.9ELK, 9.9ELN, 9.9ESK, 9.9ESN, 9.9LK, 9.9LN, 9.9SK, 9.9SN | 9.9 | 2-Stroke | 1984 catalog applications | 682-W0078-01-00 |
| Yamaha | T9.9ELHU, T9.9ELRU, T9.9EXHU, T9.9MLHU, T9.9MXHU | 9.9 | 2-Stroke | 1996 | 682-W0078-A1-00 |
Additional related references appear in parts databases for later 9.9 HP applications, including some 4-stroke and 2-stroke models. Because those records distinguish between different suffixes and component relationships, do not assume this A1 application fits an A2- or A3-designated engine without matching the original part number and model information.
Technical Specifications
- Product Type
- Aftermarket water pump impeller repair kit
- Application
- Selected Yamaha 9.9 HP and 15 HP outboard water-pump systems
- Manufacturer Reference
- 682-W0078-A1-00
- Installation
- Replacement service part; installation requires access to the water-pump assembly
- Housing Included
- Not confirmed as included; verify the package contents before ordering
- OEM Status
- Aftermarket replacement, not a genuine Yamaha part
What’s in the Box
- Water-pump impeller repair component(s) for the listed application
Package contents such as the impeller key, gaskets, wear plate, cup, seals, bolts, or pump housing are not individually confirmed for this listing. Do not assume that a complete water-pump housing or every service component is included.
Installation Notes
- Confirm the engine model, year, stroke, and original water-pump reference before beginning service.
- Disconnect the battery where applicable, remove the lanyard, and follow the engine manufacturer's safety procedures.
- Remove the lower unit according to the service-manual procedure for the specific outboard.
- Remove the water-pump cover and inspect the impeller, key, cup, wear plate, seals, and housing for damage or debris.
- Replace damaged related components as required. Install the impeller with the correct key and vane orientation for the engine.
- Reassemble the water-pump cover and lower unit, ensuring that the water tube and driveshaft are correctly aligned.
- Test the engine in an appropriate water supply and confirm a steady cooling-water tell-tale stream before normal operation.
Troubleshooting & FAQ
How do I confirm this part fits my engine?
Compare the complete model code, production year, stroke type, and original water-pump reference with the compatibility information above. Yamaha 9.9 and 15 HP engines use more than one impeller and repair-kit design, so horsepower alone is not enough.
Does this fit all Yamaha 9.9 and 15 HP outboards?
No. It is intended for selected applications associated with the 682-W0078-A1-00 or related 682-W0078-01-00 reference. Check the exact model and year before purchasing.
Is this a genuine Yamaha part?
No. This is an aftermarket replacement intended to match the listed water-pump service application.
Does the package include the pump housing?
A complete pump housing is not confirmed as included. Review the package contents and compare the required service parts with the components in your existing water-pump assembly.
What are the symptoms of a worn impeller?
Common symptoms include a weak or missing tell-tale stream, overheating warnings, elevated operating temperature, steam, or reduced cooling-water flow. Stop the engine if overheating occurs.
How often should an outboard impeller be inspected?
Inspect the impeller according to the engine manufacturer's maintenance schedule. More frequent service may be needed after operation in saltwater, sand, silt, or debris.
Safety & Important Information
- Verify the complete engine model and original part reference before ordering.
- Do not operate an outboard with a weak or absent cooling-water stream.
- Use a service manual or qualified marine technician for lower-unit and water-pump service.
- This is an aftermarket replacement and is not affiliated with or endorsed by Yamaha.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine boat and outboard maintenance.
- Application-Focused Listings — Product information is organized around model and part-number verification.
- Support for Maintenance Work — Confirm fitment and required service components before installation.
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