Water Pump Impeller Kit – Fits Johnson/Evinrude 9.9/15 HP (Replaces 394711, 18-3327)
Water Pump Impeller Kit – Fits Johnson/Evinrude 9.9/15 HP (Replaces 394711, 18-3327) 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 Johnson/Evinrude 9.9/15 HP (Replaces...
Water Pump Impeller Kit – Fits Johnson/Evinrude 9.9/15 HP (Replaces 394711, 18-3327) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit – Fits Johnson/Evinrude 9.9/15 HP (Replaces 394711, 18-3327) is engineered for Johnson/Evinrude 9.9–15 HP 2-Stroke (1974 and later) and 4-Stroke (1995 and later) outboard motors. It restores cooling system efficiency, providing a reliable solution for maintaining optimal engine temperature and performance.
This kit serves as a direct interchange for Johnson/Evinrude 394711/0394711, Sierra 18-3327, GLM 12050, Mallory 9-48201, and EMP 46-02855/46-02358, simplifying your search for the correct replacement.
- Engineered for direct replacement and straightforward installation.
- Includes the housing, impeller, wear plate, and all necessary hardware for a complete overhaul.
- Constructed with durable plastic and metal components to meet or exceed OEM specifications.
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 |
| EMP | 46-02855 / 46-02358 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Johnson/Evinrude Engines: This kit fits a wide range of 9.9 HP and 15 HP models made from 1974 onward. Note that some Bombardier-era 4-stroke models may use different parts, as they were sometimes based on other manufacturer designs. Always verify your OEM part number before ordering.
| Brand | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Johnson/Evinrude | 9.9 HP | 2-Stroke | 1974 and later | 394711 |
| Johnson/Evinrude | 9.9 HP | 4-Stroke | 1995–2004 | 394711 |
| Johnson/Evinrude | 15 HP | 2-Stroke | 1974 and later | 394711 |
| Johnson/Evinrude | 15 HP | 4-Stroke | 1995 and later | 394711 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit with Housing
- Installation
- Direct replacement
- Housing Material
- Plastic/Metal
- Other Technical Attributes
- Complete kit with housing, impeller, and necessary hardware
What’s in the Box
- 1 x Impeller (386084/18-3050)
- 1 x Housing (18-3180)
- 1 x Wear Plate (18-3178)
- 1 x Water Pump Cup (18-3179)
- 1 x Grommet (18-3329)
- 1 x Grommet (18-2392)
- 1 x Oil Seal (18-2025)
- 1 x O-Ring (18-7116)
- 1 x O-Ring (18-7139)
- 1 x Pin (18-3326)
- 4 x Stainless Steel Bolts (18-3369)
Installation Notes
- Disconnect the spark plug leads and shift the outboard into neutral.
- Remove the lower unit (gearcase) by unfastening the mounting bolts.
- Unbolt and remove the old water pump housing assembly from the driveshaft.
- Thoroughly clean the driveshaft and the housing mounting surface, removing any old gasket material or corrosion.
- Install the new components in the reverse order of removal, starting with the wear plate, gasket, and impeller. Lightly lubricate the interior of the housing and the impeller.
- Align the new housing and impeller over the driveshaft and secure it with the new bolts. Torque to manufacturer specifications.
- Reinstall the lower unit, ensuring the driveshaft and water tube are correctly aligned.
- Reconnect the spark plug leads and test the engine in a suitable water source, verifying a strong tell-tale stream.
Troubleshooting & FAQ
How do I know if this kit fits my specific engine model?
This kit is designed for most Johnson/Evinrude 9.9 HP and 15 HP models (2-stroke 1974+ and 4-stroke 1995+). The best way to guarantee fitment is to check your engine's service manual or existing part for the OEM number 394711. If it matches, this kit is a direct replacement.
What are the signs of a failing water pump impeller?
The most common symptoms of a worn impeller include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "tell-tale" outlet, or finding brittle, cracked, or melted pieces of the old impeller during an inspection.
How often should I replace my outboard's impeller?
For preventative maintenance, we recommend replacing the impeller every one to two years, or every 100-200 hours of operation. This interval should be shorter if you frequently operate in sandy, silty, or saltwater conditions.
Does this kit include the plastic housing?
Yes. This is a complete water pump repair kit that includes the outer housing, impeller, wear plate, cup, gaskets, seals, and all the necessary bolts and hardware for a full assembly replacement.
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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