Water Pump Impeller Kit – Fits Yamaha 9.9/15 HP (Replaces Yamaha 682-44352-00/01/02/03/04, Mercury/Mariner 47-84027M/T)
Water Pump Impeller Kit – Fits Yamaha 9.9/15 HP (Replaces Yamaha 682-44352-00/01/02/03/04, Mercury/Mariner 47-84027M/T) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller Kit – Fits Yamaha 9.9/15 HP (Replaces Yamaha 68...
Water Pump Impeller Kit – Fits Yamaha 9.9/15 HP (Replaces Yamaha 682-44352-00/01/02/03/04, Mercury/Mariner 47-84027M/T) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit is a direct-fit replacement for Yamaha 2-stroke 9.9/15 HP (1984–1995), 4-stroke F9.9/FT9.9/T9.9 HP (1985–2005), and all Mercury/Mariner 9.9/15 HP 2-stroke outboard engines. It's a critical component for maintaining proper engine cooling and preventing overheating.
This part serves as a direct replacement for Yamaha part numbers 682-44352-00 through 682-44352-04, Mercury/Mariner 47-84027M/T and 47-96619M, as well as aftermarket equivalents from Sierra, GLM, Quicksilver, and Mallory.
- Installation: Installs as a direct replacement for the OEM impeller.
- Material: Made from durable, chemical-resistant neoprene with a hardened nylon hub for a long service life.
- Included Hardware: Kit includes the impeller and the required woodruff key for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 682-44352-00-00 |
| Yamaha | 682-44352-01-00 |
| Yamaha | 682-44352-02-00 |
| Yamaha | 682-44352-03-00 |
| Yamaha | 682-44352-04-00 |
| Mercury/Mariner | 47-84027M |
| Mercury/Mariner | 47-84027T |
| Mercury/Mariner | 47-96619M |
| Quicksilver | 8M6010335 |
| Sierra | 18-3074 |
| GLM | 89880 |
| Mallory Marine | 9-45605 |
| CEF | 500320 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha models, this impeller fits 2-stroke 9.9 and 15 HP engines from 1984 through 1995 and various 4-stroke 9.9 HP "F" and "T" series models from 1985 to 2005.
For Mariner and Mercury/Mariner models, this part fits all production years of their 9.9 and 15 HP 2-stroke outboards, including "C" models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9 | 9.9 | 2-Stroke | 1984–1995 | 682-44352-03-00 | |
| Yamaha | 15 | 15 | 2-Stroke | 1984–1995 | 682-44352-03-00 | |
| Yamaha | F9.9 | 9.9 | 4-Stroke | 1986–2005 | 682-44352-03-00 | |
| Yamaha | FT9.9 | 9.9 | 4-Stroke | 1985–1990 | 682-44352-03-00 | |
| Yamaha | T9.9 | 9.9 | 4-Stroke | 1985–2005 | 682-44352-03-00 | |
| Mariner | 9.9 | 9.9 | 2-Stroke | All years | 47-84027M/47-84027T | |
| Mariner | 9.9C | 9.9 | 2-Stroke | All years | 47-84027M/47-84027T | |
| Mariner | 15 | 15 | 2-Stroke | All years | 47-84027M/47-84027T | |
| Mariner | 15C | 15 | 2-Stroke | All years | 47-84027M/47-84027T |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct Replacement
- Material
- Neoprene with hardened nylon hub
- Number of Blades
- 6
- Impeller Height
- 22.0 mm (0.87 inch)
- Overall Diameter
- 40.0 mm (1.57 inch)
- Hub Shaft Diameter
- 13.0 mm (0.51 inch)
- Weight
- 10 g (0.35 oz)
What’s in the Box
- 1 x Impeller (replaces 682-44352-03-00)
- 1 x Woodruff Key (replaces 90280-03024)
Installation Notes
- Disconnect the negative battery cable and ensure the outboard is in the neutral position.
- Remove the bolts securing the lower unit (gearcase) to the upper leg and carefully lower it.
- Unscrew the bolts on the water pump housing cover and lift the housing off.
- Carefully pry out the old impeller and remove the old woodruff key from the driveshaft.
- Thoroughly clean the inside of the pump housing and apply a light coat of marine grease.
- Insert the new woodruff key into its slot on the driveshaft.
- Slide the new impeller onto the driveshaft, rotating the shaft clockwise to bend the blades into position inside the housing.
- Reinstall the water pump housing, ensuring a proper seal, and tighten the bolts to the manufacturer's specified torque.
- Reattach the lower unit and test the engine's cooling system in water before operation.
Troubleshooting & FAQ
How do I know if this impeller fits my outboard?
The best way to ensure compatibility is to verify your engine's model and year against our compatibility table. You can also compare your old impeller's part number to our cross-reference list. If you're still unsure, please contact us with your engine's serial number.
What are the signs of a failing water pump impeller?
Common signs include a weak or nonexistent water stream from the "tell-tale" outlet, an engine temperature alarm, or the engine overheating. Reduced performance can also be an indicator. You may also find broken or brittle impeller blades during inspection.
How often should I replace the impeller?
As a general preventative maintenance rule, it is recommended to inspect your water pump impeller annually and replace it every 1–2 years or every 100–200 hours of operation, whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater environments.
Is this impeller difficult to install?
Installation is straightforward for those with mechanical experience and the correct tools. It involves removing the lower unit. If you are not comfortable performing this service, we strongly recommend professional installation to ensure correct assembly and function.
Is the included woodruff key important?
Yes, the woodruff key is crucial. It locks the impeller to the driveshaft, ensuring it spins with the shaft to pump water. Always use the new key provided in the kit and never reuse the old one.
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/specifications vs 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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