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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Delivery and Shipping
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Water Pump Impeller Kit – Fits Johnson/Evinrude 4–8 HP (Replaces 39...
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.
Product Details
This Water Pump Impeller Kit is a replacement service kit for selected Johnson/Evinrude 4–8 HP 2-Stroke outboards from 1980–2005 and selected 5–6 HP 4-Stroke 128cc models from 1998–2004. It is designed to replace the water-pump wear components needed to restore reliable cooling performance when the original housing remains serviceable.
This kit provides an aftermarket interchange for Johnson/Evinrude 396644 and 0396644, Sierra 18-4529, and GLM 12255. Always compare the engine model, year, original part number, and existing pump components before ordering.
- Designed to fit the original water-pump housing listed for the applicable engine applications.
- Durable marine-service materials help resist normal wear and corrosion.
- Includes an impeller, pump cup, wear plate, gaskets, O-ring, grommets, drive key, and screws for a comprehensive pump service.
Part Number Matrix
Use the following references to compare equivalent part numbers across suppliers.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 396644 |
| Johnson/Evinrude | 0396644 |
| Sierra | 18-4529 |
| GLM | 12255 |
Engine & Model Compatibility
Confirm the exact engine model, horsepower, stroke type, and year before installation. The following applications are the listed compatibility range for this replacement kit.
| 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 the main pump housing
- Installation
- Replacement service kit for the original compatible housing
- Fitting Type
- Vehicle-specific fit
- Materials
- Marine-service 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 × Impeller (389576)
- 1 × Pin/drive key (300611)
- 1 × Pump cup/impeller housing cup (324641)
- 1 × Wear plate (324640)
- 2 × Gaskets (325040)
- 1 × O-ring (303191)
- 2 × Grommets (302497 and 321129)
- 4 × Screws (324430)
Installation Notes
- Disconnect the spark-plug leads and shift the outboard into neutral.
- Remove the bolts securing the lower unit to the engine leg, then carefully lower the gearcase.
- 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 direction in which the old impeller fins are bent.
- Remove the old impeller, gaskets, wear plate, and drive key. Clean the mating surfaces thoroughly.
- Install the new wear plate, gaskets, and drive key.
- Apply a light coat of water-resistant marine grease to the inside of the new pump cup.
- Install the new impeller on the driveshaft while turning the shaft in the correct direction to seat the fins.
- Reinstall the pump cup and housing, tightening the bolts to the engine manufacturer’s recommended torque.
- Reattach the lower unit, making sure the driveshaft and water tube are correctly aligned.
- Start the engine in water after assembly and confirm a steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my engine?
Compare your engine brand, exact model, horsepower, stroke type, and year with the compatibility table. Confirming the original water-pump part number, including 396644 or 0396644, is also recommended. Do not rely on horsepower alone when confirming fitment.
How often should I replace the water-pump impeller?
As a general maintenance guideline, inspect the impeller annually and replace it every 1–2 years or 100–200 operating hours, whichever comes first. More frequent service may be appropriate when operating in sandy, silty, or saltwater conditions.
What are the signs of a failing impeller?
Common signs include a weak or inconsistent tell-tale stream, an overheating alarm, higher-than-normal operating temperature, or visible cracking, distortion, or missing pieces on the impeller fins.
Does this kit include the entire water-pump housing?
No. This is an impeller service kit and does not include the main upper and lower pump housing. It is intended for use with a functional, undamaged original housing.
What tools are required for installation?
A standard set of marine mechanic’s tools may be required, including socket and ratchet sets, screwdrivers, pliers, and a torque wrench. Water-resistant marine grease is also recommended for installation.
Is this an OEM part?
No. This listing is for an aftermarket replacement kit. The listed OEM and aftermarket part numbers are provided as reference numbers for fitment comparison.
How quickly is the order shipped?
Standard shipping is free, and typical transit time is 5–15 days. Expedited shipping options appear at checkout where available.
What are the warranty and return terms?
The 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 with your order details for assistance.
Safety & Important Information
- Confirm the engine model, year, stroke type, horsepower, and original part number before ordering.
- Compare the replacement components with the original parts before installation. If the components differ, do not install them until fitment is confirmed.
- This is an aftermarket replacement kit, not an OEM component.
- Professional installation is recommended when servicing the lower unit or water-pump assembly.
- Never operate the outboard without adequate water supply. After installation, verify cooling-water flow before normal use.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts designed for dependable service in real-world operating conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing with attention to materials and quality control.
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