Water Pump Impeller Kit – Fits Johnson/Evinrude 8-15 HP (Replaces 394711, 777801, 18-3327)
Water Pump Impeller Kit – Fits Johnson/Evinrude 8-15 HP (Replaces 394711, 777801, 18-3327) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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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 is engineered for Johnson/Evinrude 8, 9.9, and 15 HP 2-Stroke outboards (1974 and later) as well as 9.9 and 15 HP 4-Stroke models (1995–2001). It provides all necessary components to perform a full service on the water pump, restoring cooling performance and engine reliability.
It serves as a direct replacement for Johnson/Evinrude part number 394711 and interchanges with Sierra 18-3327, GLM 12050, Mallory Marine 9-48201, and others.
- Installation is a direct replacement for the original assembly.
- The kit includes the pump housing, impeller, wear plate, seals, and hardware.
- Made with a durable neoprene impeller and plastic housing for corrosion resistance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 394711 / 0394711 |
| Johnson/Evinrude | 777801 |
| Sierra | 18-3327 |
| GLM | 12050 |
| Mallory Marine | 9-48201 / 4-3327-EMP |
| PRO | 3327 |
| WSM | 750-290 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Outboard | 8 | 2-Stroke | 1974 and later | 394711 | |
| Johnson/Evinrude | Outboard | 9.9 | 2-Stroke | 1974 and later | 394711 | |
| Johnson/Evinrude | Outboard | 15 | 2-Stroke | 1974 and later | 394711 | |
| Johnson/Evinrude | Outboard | 9.9 | 4-Stroke | 1995–2001 | 394711 | |
| Johnson/Evinrude | Outboard | 15 | 4-Stroke | 1995–2001 | 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 |
IMPORTANT NOTE: Does NOT fit Johnson rebranded Suzukis (2002–2007) or Bombardier-branded 4-stroke motors (Tohatsu rebrand).
Technical Specs
- Product Type
- Water Pump Impeller Kit with Housing
- Installation
- Direct replacement
- Housing Material
- Plastic (Housing), Brass (Impeller Hub)
- Housing Color
- Black
- Impeller Material
- Neoprene
- Impeller Dimensions
- Diameter: 38.4 mm (1.51"), Height: 17.9 mm (0.70")
- Impeller Design
- 6-blade
- Internal Shaft Insert Diameter
- 12.8 mm (0.50")
- Weight
- 0.71 oz (20.1 g)
- Other Technical Attributes
- 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 spark plug wires and shift the engine into neutral.
- Remove the lower unit (gearcase) from the outboard motor. This typically involves unbolting it from the midsection.
- Unscrew the bolts securing the water pump housing cover.
- Slide the housing off and remove the old impeller, wear plate, gaskets, and seals. Note their orientation.
- Clean the mating surfaces of the housing and lower unit thoroughly, removing any old gasket material or corrosion.
- Install the new wear plate and gaskets from the kit. Apply a thin layer of marine grease.
- Slide the new impeller onto the driveshaft, turning the shaft clockwise to bend the vanes correctly. Insert the key if required.
- Lubricate the inside of the new pump housing/cup and reinstall it over the impeller.
- Secure the housing with the new bolts and O-rings provided, tightening them to the manufacturer's specified torque.
- Reinstall the lower unit onto the outboard, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Reconnect spark plug wires and test the engine in water, confirming a steady stream of water from the tell-tale port.
Troubleshooting & FAQ
How do I confirm this kit will fit my engine?
The surest way is to match your engine's model and year to the ranges in the "Engine & Model Compatibility" table. Also, verify your existing OEM part number against the "Part Number Matrix." Do not purchase if your model falls into the exclusion list (Suzuki/Tohatsu rebrands).
What are common signs of a bad water pump impeller?
The most common sign is engine overheating at idle or low speeds. Other indicators include a weak or non-existent water stream from the "tell-tale" outlet, a high temperature alarm, or the engine going into "limp mode."
How often should a water pump impeller be replaced?
As a preventative maintenance item, most manufacturers recommend replacing the impeller 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.
Why buy a full kit instead of just the impeller?
The housing, cup, wear plate, and seals also wear out over time. A worn housing or plate can reduce pumping efficiency even with a new impeller. This complete kit ensures all critical components are replaced for a full and lasting repair.
Does this kit fit newer Johnson 4-stroke motors?
No. It is crucial to note this kit does NOT fit Johnson engines made by Suzuki (2002–2007) or Bombardier-branded 4-stroke motors, which were made by Tohatsu. Please verify your engine's original manufacturer before ordering.
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.
Payment & Security
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