Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP Outboards (Replaces 396644, 0396644, 18-4529)
Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP Outboards (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
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP Outboards (R...
Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP Outboards (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 – Fits Johnson/Evinrude 4-8 HP Outboards (Replaces 396644) provides everything needed for a complete water pump service. It is designed for Johnson/Evinrude 4 HP (1986–1992), 5 HP (1980–1983, 1996–2001), 6 HP (1984–2005), and 8 HP (1980–2005) outboard engines, ensuring reliable cooling performance.
This kit serves as a direct replacement for Johnson/Evinrude part number 396644 / 0396644, Sierra 18-4529, and GLM 12065.
- Engineered for direct-drive installation.
- Fits a wide range of 2-stroke and 4-stroke models.
- Includes impeller, wear plate, housing, gaskets, and hardware.
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 | 12065 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Johnson/Evinrude | Outboards | 4 | 2-Stroke | 1986–1992 | 396644 |
| Johnson/Evinrude | Outboards | 4.5 | 2-Stroke | 1980–1984 | 396644 |
| Johnson/Evinrude | 4 Deluxe | 4 | 2-Stroke | 1985–1988 | 396644 |
| Johnson/Evinrude | Outboards | 5 | 2-Stroke | 1980–1983, 1996–2001 | 396644 |
| Johnson/Evinrude | Outboards | 5 | 4-Stroke (128cc) | 1998–2004 | 396644 |
| Johnson/Evinrude | Outboards | 6 | 2-Stroke | 1984–2001, 2003–2005 | 396644 |
| Johnson/Evinrude | Outboards | 6 | 4-Stroke (128cc) | 1998–2004 | 396644 |
| Johnson/Evinrude | Outboards | 7.5 | 2-Stroke | 1980–1985 | 396644 |
| Johnson/Evinrude | Outboards | 8 | 2-Stroke | 1980–2001, 2003–2005 | 396644 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Direct replacement
- Connection
- Direct drive
- Weight
- 0.009 kg (0.02 lb)
- Fitting Type
- OEM direct replacement
- Other Technical Attributes
- Kit includes impeller, wear plate, gaskets, and mounting hardware
- Warranty
- Varies by manufacturer
What’s in the Box
- 1 x Drive Key (331130/18-3026)
- 1 x Grommet (321129/18-1827)
- 1 x Grommet (302497/18-3329)
- 1 x Screws (324430/18-4277)
- 1 x Impeller Housing Plate (324640/18-4578)
- 1 x Impeller Housing Cup (324641/18-4551)
- 1 x Impeller Housing Gasket (325040/18-99156)
- 1 x Impeller Assembly (389576/18-3091)
- 1 x O-Ring (303191/18-7413)
Installation Notes
- Disconnect the battery and spark plug wires for safety.
- Unbolt and remove the lower unit (gearcase) from the outboard leg.
- Locate and unbolt the water pump housing cover to expose the old impeller.
- Remove the old impeller, key, gaskets, and wear plate. Clean all surfaces thoroughly.
- Install the new wear plate and gaskets.
- Slide the new impeller key onto the driveshaft.
- Lubricate the new impeller and housing, then install the impeller, turning the driveshaft clockwise to seat the vanes.
- Reinstall the housing, cup, and grommets, ensuring a proper seal.
- Reattach the lower unit to the outboard, ensuring the driveshaft and water tube align.
- Reconnect the battery and test the engine in a suitable water supply, checking for a strong tell-tale stream.
Troubleshooting & FAQ
How do I know if this kit will fit my specific outboard motor?
The best way to confirm fitment is to check the "Engine & Model Compatibility" table on this page. Compare your engine's brand, model, horsepower, and year against the listed ranges. You can also cross-reference your existing part number with those in the "Part Number Matrix."
What are the common signs of a failing water pump impeller?
A weak or non-existent water stream from the "tell-tale" outlet is the most common sign. Other symptoms include the engine overheating alarm sounding, steam from the exhaust, or reduced engine performance as the ECU limits RPMs to prevent damage.
How often should I replace the water pump impeller?
As a general maintenance item, it is recommended to replace 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 conditions.
Is this kit difficult to install for a beginner?
Installation requires basic mechanical skills and tools to drop the lower unit. While it can be done by a DIY-er with a service manual, we recommend professional installation if you are not comfortable with the process to ensure safety and proper function.
Does this kit include the entire water pump housing?
Yes, this kit includes the impeller housing cup and plate, along with the impeller, gaskets, grommets, and other necessary components for a complete rebuild as detailed in the "What's in the Box" section.
What is the difference between this impeller and the original OEM part?
This is an aftermarket part designed to meet or exceed OEM specifications. It offers a comparable level of performance and durability to the original part but at a more competitive price point.
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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