Water Pump Impeller Kit – Fits Johnson/Evinrude 8-15 HP (Replaces 394711)
Water Pump Impeller Kit – Fits Johnson/Evinrude 8-15 HP (Replaces 394711) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller Kit – Fits Johnson/Evinrude 8-15 HP (Replaces 3...
Product Details
This complete Water Pump Impeller Kit provides everything needed to rebuild the water pump on Johnson/Evinrude 8 HP, 9.9 HP, and 15 HP outboards. It is designed for 2-stroke models from 1974 and up, as well as 4-stroke models from 1995 and up, serving as a direct replacement for OEM part number 394711.
It directly interchanges with several part numbers, including Johnson/Evinrude 394711/0394711, Sierra 18-3327, GLM 12050, Mallory 9-48201, and WSM 750-290.
- Direct replacement installation requires no modifications.
- Includes a new housing, impeller, wear plate, and all necessary gaskets and seals.
- Engineered for reliable performance in both freshwater and saltwater environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 394711 / 0394711 |
| Sierra | 18-3327 |
| GLM | 12050 |
| Mallory | 9-48201 |
| Mallory | 4-3327-EMP |
| PRO | 3327 |
| WSM | 750-290 |
| Cross-Reference | 391698, 0386697, 386697, 387610, 46-02855, 389112, 318875, 318999, 319989, 386685, 386886, 388139, 389114, 391388, 391689, 393560, 0394771, 777801 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for a wide range of Johnson/Evinrude outboards. Please verify your specific model and year against the compatibility list.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Outboard | 8 | 2-Stroke | 1974–UP | 394711 | |
| Johnson/Evinrude | Outboard | 9.9 | 2-Stroke | 1974–UP | 394711 | |
| Johnson/Evinrude | Outboard | 15 | 2-Stroke | 1974–UP | 394711 | |
| Johnson/Evinrude | Outboard | 9.9 | 4-Stroke | 1995–UP | 394711 | |
| Johnson/Evinrude | Outboard | 15 | 4-Stroke | 1995–UP | 394711 | |
| Johnson/Evinrude | Outboard (211cc) | 8/9.9 | 4-Stroke | 1996–2004 | 394711 | |
| Johnson/Evinrude | Outboard (305cc) | 9.9/15 | 4-Stroke | 1995–2001 | 394711 |
Technical Specs
- Product Type
- Water Pump Impeller Kit with Housing
- Installation
- Direct replacement
- Housing Color
- Black
- Key Components
- Complete water pump rebuild kit including housing
What’s in the Box
- 1 x Pump Housing (435390)
- 1 x Pump Cup (324097)
- 1 x Neoprene Impeller (386084)
- 1 x Pin (300611)
- 1 x Seal (318972)
- 1 x Wear Plate (318995)
- 2 x O-Ring (202893/319085)
- 3 x Grommet (338908/302497/327035)
- 4 x Installation Bolt (302325)
Installation Notes
- Disconnect the battery and spark plug leads for safety.
- Place a drain pan under the lower unit and remove the gearcase oil drain/fill screws to empty the oil.
- Remove the bolts securing the lower unit (gearcase) to the outboard's main housing and carefully lower it.
- Unbolt and remove the old water pump housing assembly from the driveshaft.
- Clean the mounting surfaces and inspect the driveshaft for any wear or damage.
- Install the new components from the kit in the reverse order of removal, starting with the wear plate, gaskets, and impeller. Ensure the impeller vanes are oriented correctly.
- Lubricate the new housing interior and seals before sliding the new assembly down the driveshaft.
- Secure the new pump housing with the provided bolts, tightening them to the manufacturer's specified torque.
- Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube align properly.
- Refill the gearcase with the recommended marine gear lubricant.
- Reconnect the battery and test the engine in a suitable water source, confirming a steady stream from the telltale outlet.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine?
The surest way is to match your engine's model, horsepower (HP), and year to the details in our 'Engine & Model Compatibility' table. This kit is a direct replacement for OEM part number 394711, so cross-referencing that number is also a reliable method.
What are the common signs of a failing water pump impeller?
Key indicators include the engine running hotter than normal, a weak or absent stream of water from the telltale (water indicator) outlet, or finding cracked, brittle, or broken vanes during a visual inspection of the old impeller.
How often should I replace my water pump impeller?
For preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1 to 2 years, or every 100-200 hours of operation. Service intervals should be shorter for boats used frequently in saltwater or silty/sandy conditions.
What is the difference between this aftermarket kit and an OEM part?
This is a high-quality aftermarket kit designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It offers a cost-effective alternative to OEM parts without compromising on performance or reliability.
Are any special tools required for this installation?
Standard mechanical hand tools such as a socket/ratchet set, screwdrivers, and pliers are generally sufficient. A torque wrench is highly recommended to ensure all bolts are tightened to the correct manufacturer specifications during reassembly.
Is this an OEM part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, where it is batch-inspected for consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options will appear at checkout where available.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their 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.
Payment & Security
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