Water Pump Impeller Kit with Housing for Johnson/Evinrude 9.9–15 HP Outboards – Replaces OEM 394711
Water Pump Impeller Kit with Housing for Johnson/Evinrude 9.9–15 HP Outboards – Replaces OEM 394711 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Kit with Housing for Johnson/Evinrude 9.9–15 HP...
Water Pump Impeller Kit with Housing for Johnson/Evinrude 9.9–15 HP Outboards – Replaces OEM 394711 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit with Housing is an aftermarket replacement water pump kit for select Johnson/Evinrude 9.9 HP and 15 HP outboard engines. It replaces OEM reference 394711 and is supplied with the housing, impeller, wear plate, cup, seals, grommets, pin, O-rings, and stainless-steel bolts needed to service the water pump assembly.
The kit corresponds to Sierra 18-3327 and is listed for Johnson/Evinrude applications using the 394711 water-pump reference. Confirm the model, year, original part number, and component configuration before ordering.
- Complete water pump kit supplied with housing.
- Designed as a replacement for the water pump assembly associated with OEM 394711.
- Includes the impeller and related seals, grommets, plate, cup, pin, and fasteners shown in the package list below.
- Aftermarket replacement component; not an OEM Johnson/Evinrude part.
Part Number Matrix
Use these references to compare the replacement with your existing water pump components.
| Brand or Reference | Part Number |
|---|---|
| Johnson/Evinrude OEM | 394711 / 0394711 |
| Sierra | 18-3327 |
| GLM | 12050 |
| Mallory | 9-48201 |
| EMP | 46-02855 / 46-02358 |
Engine & Model Compatibility
The catalog application for this water pump reference covers select Johnson/Evinrude outboards in the ranges below. These ranges are not a substitute for checking the complete model designation or serial-number application.
| Brand | Rated HP | Stroke | Application Year | OEM Part No. |
|---|---|---|---|---|
| Johnson/Evinrude | 9.9 HP | 2-Stroke | 1974 and later | 394711 |
| Johnson/Evinrude | 15 HP | 2-Stroke | 1974 and later | 394711 |
| Johnson/Evinrude | 9.9–15 HP | 4-Stroke | 1994 and later | 394711 |
Some later or Bombardier-era four-stroke models may use water-pump components from different engine designs. Verify the OEM number and compare the original housing and component layout before purchase.
Technical Specs
- Product Type
- Water pump impeller repair kit with housing
- Replacement Reference
- OEM 394711; Sierra 18-3327
- Installation
- Replacement installation in the water pump assembly
- Housing
- Included
- Impeller
- Included; reference 18-3050
- Fasteners
- Four stainless-steel bolts included
- Construction
- Plastic, rubber, metal, and stainless-steel components
What’s in the Box
- 1 x Impeller — 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 place the outboard in neutral.
- Remove the lower unit by unfastening the applicable mounting bolts.
- Remove the existing water pump housing assembly from the driveshaft.
- Clean the driveshaft and water-pump mounting surfaces, removing old gasket material, debris, and corrosion.
- Install the wear plate, cup, impeller, seals, grommets, pin, and other components in the correct order for your engine.
- Align the housing over the driveshaft and secure it with the supplied bolts. Tighten fasteners to the engine manufacturer’s specifications.
- Reinstall the lower unit and confirm correct alignment of the driveshaft and water tube.
- Run the engine only in an appropriate water source or with the correct flushing equipment, and verify a strong tell-tale stream before normal operation.
Always follow the service manual for your exact engine model. Water-pump component order and torque specifications can vary by model.
Troubleshooting & FAQ
How do I confirm that this kit fits my engine?
Check that your Johnson/Evinrude engine is a listed 9.9 HP or 15 HP application and that the existing water-pump assembly uses OEM reference 394711 or the corresponding Sierra 18-3327 reference. Confirm the complete model designation, year, serial-number range, and housing configuration before ordering.
What are the signs of a failing water pump impeller?
Common signs include overheating at idle or low speed, a weak or intermittent tell-tale stream, or brittle, cracked, melted, or missing impeller vanes during inspection.
How often should an outboard impeller be replaced?
Replacement intervals depend on the engine manufacturer’s maintenance schedule and operating conditions. Inspect the impeller regularly and replace it when the service manual specifies or whenever it shows wear, damage, hardening, or loss of vane shape. Frequent operation in sand, silt, or salt water may require more frequent service.
Does this kit include the housing?
Yes. This is the with-housing version of the water pump kit. The package includes the housing, impeller, wear plate, water pump cup, grommets, seals, O-rings, pin, and four stainless-steel bolts listed above.
Is this an OEM part?
No. This is an aftermarket replacement kit intended to replace the water pump assembly associated with OEM reference 394711. It is not manufactured by Johnson/Evinrude.
What should I compare before installation?
Compare the original impeller, housing, wear plate, cup, pin, seal locations, and bolt pattern with the supplied components. Do not install the kit if the configuration or part reference does not match your engine.
Safety & Important Info
- Verify the complete engine model, year, serial-number application, and OEM part number before ordering.
- Compare the supplied components with the original water-pump assembly before installation.
- Use the engine service manual for removal procedures, component order, clearances, and torque specifications.
- Do not operate the outboard without an adequate water supply.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended if you are not familiar with outboard lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — Replacement components for common outboard maintenance and repair applications.
- Application-Focused Listings — Product references and fitment details are provided to help you compare the replacement with your original part.
- Customer Support — Contact support with your complete engine model and original part information if you need help checking compatibility.
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