Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP (Replaces 396644, 0396644, 18-4529)
Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP (Replaces 396644, 0396644, 18-4529) 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 4-8 HP (Replaces 39...
Product Details
This Water Pump Impeller Kit is a direct replacement for Johnson/Evinrude 4–8 HP 2-Stroke outboards (1980–2005) and 5–6 HP 4-Stroke (128cc) models (1998–2004). It contains all necessary components to rebuild the water pump for reliable cooling performance.
This kit provides an interchange for Johnson/Evinrude 396644 / 0396644, Sierra 18-4529, and GLM 12255.
- Designed for a direct fit into the original water pump housing.
- Constructed from durable, marine-grade materials to resist wear and corrosion.
- Includes a new impeller, wear plate, cup, gaskets, and hardware for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 396644 |
| Johnson/Evinrude | 0396644 |
| Sierra | 18-4529 |
| GLM | 12255 |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
For Johnson/Evinrude engines, this kit fits a wide range of small horsepower 2-stroke and 4-stroke models manufactured between 1980 and 2005.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 4 | 2-Stroke | 1986–1992 | 396644 | |
| Johnson/Evinrude | Various | 4.5 | 2-Stroke | 1980–1984 | 396644 | |
| Johnson/Evinrude | 4 Deluxe | 4 | 2-Stroke | 1985–1988 | 396644 | |
| Johnson/Evinrude | Various | 5 | 2-Stroke | 1980–1983, 1996–2001 | 396644 | |
| Johnson/Evinrude | Various | 6 | 2-Stroke | 1984–2001, 2003–2005 | 396644 | |
| Johnson/Evinrude | Various | 5 | 4-Stroke (128cc) | 1998–2004 | 396644 | |
| Johnson/Evinrude | Various | 6 | 4-Stroke (128cc) | 1998–2004 | 396644 | |
| Johnson/Evinrude | Various | 8 | 2-Stroke | 1980–2001, 2003–2005 | 396644 | |
| Johnson/Evinrude | Various | 6 | 2-Stroke | 1980–1985 | 396644 | |
| Johnson/Evinrude | Various | 7.5 | 2-Stroke | 1980–1985 | 396644 |
Technical Specs
- Product Type
- Water Pump Impeller Kit (without housing)
- Installation
- Direct fit to original housing
- Fitting Type
- Vehicle Specific Fit
- Materials
- Marine Grade Materials
- Package Dimensions
- 4.29 × 3.82 × 2.24 inches (109 × 97 × 57 mm)
- Package Weight
- 6.2 ounces (176 g)
What’s in the Box
- 1 x Impeller (389576)
- 1 x Pin/Drive Key (300611)
- 1 x Pump Cup/Impeller Housing Cup (324641)
- 1 x Wear Plate (324640)
- 2 x Gaskets (325040)
- 1 x O-Ring (303191)
- 2 x Grommets (302497, 321129)
- 4 x Screws (324430)
Installation Notes
- Disconnect the spark plug leads and shift the outboard into neutral.
- Remove the bolts securing the lower unit (gearcase) to the engine leg and carefully lower it.
- Locate the water pump housing on top of the gearcase and remove its mounting bolts.
- Slide the housing up and off the driveshaft to expose the impeller. Note the rotational direction of the old impeller fins.
- Remove the old impeller, gaskets, wear plate, and drive key. Clean all mating surfaces thoroughly.
- Install the new wear plate, gaskets, and drive key.
- Apply a light coat of marine grease to the inside of the new pump cup.
- Slide the new impeller onto the driveshaft while turning the shaft clockwise to bed the fins correctly.
- Reinstall the pump cup and housing, tightening bolts to the manufacturer's recommended torque.
- Reattach the lower unit, ensuring the driveshaft and water tube align correctly.
- Once assembled, start the engine in water and confirm a steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
Your first step is to check the detailed compatibility table in this listing. Compare your engine's brand, model, horsepower, and year range against the data provided. Verifying your OEM part number (396644) is the most reliable method.
How often should I replace the water pump impeller?
As a general maintenance guideline, impellers should be inspected annually and replaced every 1 to 2 years (or 100-200 operating hours), whichever comes first. This interval can be shorter if you frequently operate in sandy, silty, or saltwater conditions.
What are the signs of a failing impeller?
The most common sign is a weak or inconsistent water stream from the engine's tell-tale outlet. Other indicators include the engine overheating alarm sounding, higher-than-normal engine temperatures, or visible damage/cracking on the impeller fins during inspection.
Does this kit include the entire water pump housing?
No, this is an impeller rebuild kit without the main upper and lower plastic or metal housing. It is designed to service a pump with a functional, undamaged original housing by replacing all critical wear components inside it.
What tools are required for installation?
You will need a standard set of mechanic's tools, including socket and ratchet sets, a torque wrench, screwdrivers, and pliers. A water-resistant marine grease is also essential for lubricating the impeller and seals upon installation.
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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