Water Pump Impeller Kit with Housing – Fits Johnson/Evinrude 8–15 HP (Replaces 394711; Sierra 18-3327)
Water Pump Impeller Kit with Housing – Fits Johnson/Evinrude 8–15 HP (Replaces 394711; Sierra 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
Orders are typically processed within 1–2 business days.
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Water Pump Impeller Kit with Housing – Fits Johnson/Evinrude 8–15 H...
Water Pump Impeller Kit with Housing – Fits Johnson/Evinrude 8–15 HP (Replaces 394711; Sierra 18-3327) is backordered and will ship as soon as it is back in stock.
Product Details
This complete Water Pump Impeller Kit with Housing is designed for selected Johnson/Evinrude outboards using the water pump assembly associated with OEM part number 394711. It includes the housing, impeller, wear plate, pump cup, seals, grommets, pin, O-rings, and stainless-steel mounting bolts needed for a water pump service.
The kit replaces Johnson/Evinrude OEM part number 394711 and is listed under Sierra part number 18-3327. GLM part number 12050 is also associated with the same Johnson/Evinrude application family. Always confirm the complete engine model, year, gearcase, and existing pump assembly before ordering.
- Complete water pump kit supplied with housing.
- Direct replacement-style service kit for the specified application.
- Includes the impeller and the principal pump housing and sealing components.
- Aftermarket replacement part; not an original OEM-branded assembly.
Part Number Matrix
Use the following verified reference numbers together with your engine model and year to confirm compatibility.
| Brand or Reference | Part Number | Reference Type |
|---|---|---|
| Johnson/Evinrude | 394711 | OEM replacement reference |
| Sierra | 18-3327 | Aftermarket water pump kit reference |
| GLM | 12050 | Aftermarket Johnson/Evinrude application reference |
| Included impeller | 386084 | OEM component reference |
Engine & Model Compatibility
The catalog application information separates the fitment by horsepower, stroke, and model year. These conditions must be kept together when checking your engine.
| Brand | Engine Application | Rated HP | Stroke | Years | OEM Reference | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Outboard | 4, 4.5, 5, 6, 7.5, 8 | 2-Stroke | 1980 and later | 394711 | Application listed for the small water-pump assembly. |
| Johnson/Evinrude | Outboard | 9.9, 15 | 2-Stroke | 1974 and later | 394711 | Confirm the exact model and gearcase configuration. |
| Johnson/Evinrude | Outboard | 9.9–15 | 4-Stroke | 1994 and later | 394711 | Verify the original pump assembly before purchase. |
Important: Do not rely on horsepower alone. Confirm the engine brand, exact model designation, year, stroke type, gearcase, and original water pump reference. This listing should not be assumed to fit Johnson-branded Suzuki rebrands or Bombardier-branded four-stroke engines without an exact part-number match.
Technical Specs
- Product Type
- Water pump impeller kit with housing
- Installation
- Replacement-style water pump service installation
- Housing Included
- Yes
- Impeller Included
- Yes; component reference 386084
- Impeller Design
- Application-specific replacement impeller
- Primary OEM Reference
- 394711
- Aftermarket References
- Sierra 18-3327; GLM 12050
- Application Family
- Selected Johnson/Evinrude 8–15 HP outboards and other catalog-listed small outboard applications
What’s in the Box
- 1 x Water pump housing, component reference 435390
- 1 x Wear plate, component reference 318995
- 1 x Water pump cup, component reference 324097
- 1 x Impeller, component reference 386084
- 1 x Grommet, component reference 302497
- 1 x Grommet, component reference 327035
- 1 x Oil seal, component reference 318972
- 1 x O-ring, component reference 303097
- 1 x O-ring, component reference 319085
- 1 x Pin, component reference 300771
- 4 x Stainless-steel mounting bolt, component reference 319126
Installation Notes
- Disconnect the battery or ignition as appropriate and ensure the engine is secure before beginning service.
- Remove the lower unit according to the instructions for your specific Johnson/Evinrude model.
- Remove the existing water pump housing and inspect the driveshaft, water tube, key or pin arrangement, and mating surfaces.
- Remove the old impeller, wear plate, pump cup, seals, O-rings, grommets, pin, and mounting hardware.
- Clean the pump cavity and all mating surfaces. Remove corrosion and old gasket or seal residue without damaging the sealing surfaces.
- Install the included wear plate, seals, O-rings, grommets, pin, and pump cup in the correct orientation for your engine.
- Install the new impeller on the driveshaft, using the correct key or pin arrangement required by the engine.
- Lubricate the pump housing and impeller with a suitable lubricant recommended for water pump installation, then install the housing without damaging the impeller vanes.
- Install and tighten the supplied bolts to the engine manufacturer’s specified torque.
- Reinstall the lower unit, ensuring that the driveshaft, shift shaft, and water tube are correctly aligned.
- Run the engine only in a suitable test tank or on the boat in water. Confirm cooling-water flow and check carefully for leaks or overheating.
Professional installation is recommended when the lower unit or water pump has not previously been serviced.
Troubleshooting & FAQ
How do I confirm that this kit fits my engine?
Match the complete engine model, year, horsepower, stroke type, and gearcase configuration to the compatibility table. Then compare the existing pump reference with 394711, Sierra 18-3327, or GLM 12050. If any of these details differ, obtain confirmation before ordering.
What are common signs of a worn water pump impeller?
Possible signs include overheating, reduced cooling-water flow, a weak tell-tale stream, or a temperature warning. Stop operating the engine if overheating occurs and inspect the cooling system.
Why replace the complete kit instead of only the impeller?
The housing, wear plate, pump cup, seals, grommets, O-rings, pin, and mounting hardware can also wear or deteriorate. Replacing the related service components together helps restore the intended water-pump sealing and pumping surfaces.
Does this kit fit every Johnson/Evinrude 8–15 HP engine?
No. The catalog separates applications by horsepower, stroke, and year. The 8 HP two-stroke application begins at 1980, while the 9.9 and 15 HP two-stroke application begins at 1974; the 9.9–15 HP four-stroke application begins at 1994. Confirm the exact engine information before purchase.
Is this an OEM part?
No. This is an aftermarket replacement kit. Johnson/Evinrude numbers are provided only as application and replacement references.
Shipping speed and cost
Standard shipping is free, with typical transit of 5–15 days. Expedited delivery options appear at checkout where available.
Warranty and returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the standard return window when the item is unused and in its original condition. Contact support for current policy and return instructions.
Safety & Important Information
- Verify the engine model, year, stroke, gearcase, and original part reference before ordering.
- Compare the supplied components with the original assembly before installation.
- Do not operate an outboard without an adequate cooling-water supply.
- Stop the engine immediately if overheating, loss of water flow, or an abnormal warning occurs.
- This is an aftermarket replacement, not an OEM-branded component.
- Professional installation is recommended for safe and reliable service.
About Sea Sierra
- Marine Replacement Parts — We supply replacement components for common marine service applications.
- Global Fulfillment — Standard delivery is available to most regions, with estimated transit shown at checkout.
- Practical Value — Complete service kits help simplify routine maintenance and repair.
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