Water Pump Impeller – Fits Yamaha 9.9/15 HP and F9.9/FT9.9/T9.9 (Replaces Yamaha 682-44352-00/01/02/03/40 and Mercury/Mariner 47-84027M/T, 47-96619M)
Water Pump Impeller – Fits Yamaha 9.9/15 HP and F9.9/FT9.9/T9.9 (Replaces Yamaha 682-44352-00/01/02/03/40 and Mercury/Mariner 47-84027M/T, 47-96619M) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Water Pump Impeller – Fits Yamaha 9.9/15 HP and F9.9/FT9.9/T9.9 (Re...
Water Pump Impeller – Fits Yamaha 9.9/15 HP and F9.9/FT9.9/T9.9 (Replaces Yamaha 682-44352-00/01/02/03/40 and Mercury/Mariner 47-84027M/T, 47-96619M) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller is an aftermarket replacement impeller for selected Yamaha 9.9 HP and 15 HP outboard engines, including Yamaha 2-stroke models from 1984 and later. It is also listed for Yamaha F9.9, FT9.9, and T9.9 models, as well as 2-stroke Mercury/Mariner 9.9C and 15C outboards.
The impeller is designed to restore water-pump circulation and help maintain the outboard cooling system. Confirm the exact engine model, year, and existing impeller dimensions before ordering.
- Product type: Water pump impeller; sold as a single impeller, not a kit.
- Installation: Direct replacement for the original impeller when the engine application and dimensions match.
- Impeller design: Six-blade design with a 13 mm bore, 40 mm outside diameter, and 22 mm width.
- Aftermarket replacement: Not manufactured by Yamaha, Mercury, or Mariner.
Part Number Matrix
Use the following manufacturer and aftermarket references to help compare your original part. Number references do not replace verification of the complete engine application.
| Brand | Part Number |
|---|---|
| Yamaha | 682-44352-00 |
| Yamaha | 682-44352-01-00 |
| Yamaha | 682-44352-02-00 |
| Yamaha | 682-44352-03-00 |
| Yamaha | 682-44352-40 |
| Mercury/Mariner | 47-84027M |
| Mercury/Mariner | 47-84027T |
| Mercury/Mariner | 47-96619M |
| Sierra | 18-3074 |
| GLM | 89880 |
| Mallory Marine | 9-45605 |
Engine & Model Compatibility
Fitment depends on the complete engine application. Keep the horsepower, stroke, model designation, year, and serial-number conditions together when checking compatibility.
| Brand | Model or Application | Rated HP | Stroke | Year Condition | Applicable References |
|---|---|---|---|---|---|
| Yamaha | 9.9 and 15 HP outboards | 9.9 / 15 | 2-Stroke | 1984 and later | 682-44352-00, 682-44352-01-00, 682-44352-02-00, 682-44352-03-00, 682-44352-40 |
| Yamaha | F9.9, FT9.9, and T9.9 | 9.9 | 4-Stroke or model-specific application | Verify model year and serial number | 682-44352-00, 682-44352-01-00, 682-44352-02-00, 682-44352-03-00, 682-44352-40 |
| Mercury/Mariner | 9.9C and 15C | 9.9 / 15 | 2-Stroke | Verify model year and serial number | 47-84027M, 47-84027T, 47-96619M |
Technical Specs
- Product Type
- Water pump impeller
- Product Configuration
- Single impeller
- Installation
- Direct replacement
- Number of Blades
- 6
- Bore / Inner Diameter
- 13 mm (0.500 inch)
- Overall Diameter
- 40 mm (1.565 inch)
- Impeller Width
- 22 mm (0.865 inch)
What’s in the Box
- 1 x Water pump impeller
Important: This listing is for the impeller only. A woodruff key, gasket, water-pump housing, and other service parts are not included unless specifically stated in the order contents.
Installation Notes
- Disconnect the battery as applicable and make sure the outboard is in neutral before servicing.
- Remove the bolts securing the lower unit and carefully lower the gearcase.
- Remove the water-pump housing cover.
- Remove the old impeller and inspect the driveshaft key, pump plate, housing, and related seals for wear or damage.
- Clean the pump housing and plate before installing the replacement impeller.
- Reuse the original key only if it is undamaged and the service manual permits reuse; replace it when worn or damaged.
- Install the impeller in the correct direction and refit the pump housing according to the engine manufacturer's service procedure.
- Reinstall the lower unit, tighten fasteners to the manufacturer's specified torque, and test the cooling-water flow before normal operation.
Troubleshooting & FAQ
How do I know if this impeller fits my outboard?
Compare your engine brand, model designation, horsepower, stroke, year, and serial-number range with the compatibility information above. Also compare the original impeller's dimensions and part number. If any detail differs, contact us with the complete engine model and serial number before ordering.
What are the signs of a failing water-pump impeller?
Common signs include weak or absent tell-tale water flow, an engine-temperature alarm, overheating, or damaged, brittle, or missing impeller blades during inspection.
How often should I replace the impeller?
Inspect the impeller according to the engine manufacturer's maintenance schedule. Replacement may be needed sooner when the outboard is operated in sandy, silty, or saltwater conditions, or when the engine has been stored for an extended period.
Is this impeller difficult to install?
Installation requires lower-unit removal and correct water-pump reassembly. It is suitable for a qualified mechanic or an experienced owner using the applicable service manual. Professional installation is recommended if you are not familiar with outboard lower-unit service.
Does this listing include a woodruff key?
No. The company product record identifies this item as a single water-pump impeller, not a kit. The woodruff key is not included in this listing.
Is this an OEM impeller?
No. This is an aftermarket replacement. Yamaha, Mercury, Mariner, Sierra, GLM, and Mallory names and part numbers are provided only for application and reference purposes.
Shipping speed & cost
We ship worldwide. Typical transit is 5–15 days, and standard shipping is free where available. Expedited options appear at checkout when available.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the applicable standard return period for unused products in original condition. Contact support for order-specific instructions.
Safety & Important Info
- Verify the complete engine application and compare the original part dimensions before purchase.
- Do not operate an outboard with inadequate cooling-water flow.
- This is an aftermarket replacement impeller, not an OEM component.
- Use the engine manufacturer's service procedure and specified torque values during installation.
- Professional installation is recommended when lower-unit service is outside your experience.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket marine parts for routine repair and maintenance.
- Global Fulfillment — Standard delivery is available to most regions, with delivery options shown at checkout.
- Practical Value — Replacement parts are selected for common marine service applications.
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