Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP 1980+ (Replaces 396644, 0396644)
Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP 1980+ (Replaces 396644, 0396644) 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.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP 1980+ (Repla...
Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP 1980+ (Replaces 396644, 0396644) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit is designed for Johnson/Evinrude 4–8 HP, 2-Stroke outboard motors manufactured between 1980 and 2005. It provides a complete solution for servicing your engine's cooling system, with applications including 4 HP Deluxe (1985–1992), 4.5 HP (1980–1984), 5 HP (1980–1983, 1986–2001), 6 HP (1984–2001, 2003–2005), and 8 HP (1980–2001, 2003–2005) models.
It serves as a direct replacement for Johnson/Evinrude part numbers 396644 / 0396644, Sierra 18-4529, and GLM Marine 12065.
- Engineered for direct installation using OEM-equivalent components.
- Housing components are crafted from durable Nylon PA66 plastic.
- Kit includes all necessary gaskets, seals, and hardware for a full replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 396644 / 0396644 |
| Sierra | 18-4529 |
| GLM Marine | 12065 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for a range of Johnson/Evinrude outboard motors. Verify your specific model details to ensure a correct fit.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Outboard | 4 HP | 2-Stroke | 1986–1992 | 396644 | 4 HP Deluxe models |
| Johnson/Evinrude | Outboard | 4.5 HP | 2-Stroke | 1980–1984 | 396644 | |
| Johnson/Evinrude | Outboard | 5 HP | 2-Stroke | 1980–1983, 1996–2001 | 396644 | |
| Johnson/Evinrude | Outboard | 6 HP | 2-Stroke | 1984–2001, 2003–2005 | 396644 | |
| Johnson/Evinrude | Outboard | 8 HP | 2-Stroke | 1980–2001, 2003–2005 | 396644 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Direct replacement with OEM-equivalent components
- Housing Material
- Nylon PA66 Plastic (with reuse of original housing)
- Housing Color
- Black
What’s in the Box
- 1 x Impeller Assembly (389576/18-3091)
- 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 Drive Key (331130/18-3026)
- 1 x Grommet (321129/18-1827)
- 1 x Grommet (302497/18-3329)
- 2 x Stainless Steel Screws (324430/18-4277)
- 1 x O-Ring (303191/18-7413)
Installation Notes
- Disconnect the battery and spark plug wires for safety.
- Drain the gearcase oil and remove the lower unit (gearcase) from the outboard motor.
- Remove the bolts securing the water pump housing to access the impeller.
- Take note of the old components' orientation before removing the old impeller, key, cup, and plate.
- Clean all mounting surfaces thoroughly, removing any old gasket material or debris.
- Install the new gasket, plate, O-ring, cup, impeller, and key in the correct order. Use a small amount of marine grease to aid installation.
- Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
- Reattach the lower unit, refill the gearcase oil, and reconnect the battery/spark plugs.
- Start the engine in water and verify a strong, steady stream from the cooling system's tell-tale port.
Troubleshooting & FAQ
How do I know if my water pump impeller is failing?
Common signs of a failing impeller include a weak or non-existent water stream from the engine's tell-tale port, engine overheating alarms, or a melted water pump housing. Upon inspection, a worn impeller may appear brittle, cracked, or have missing vanes.
How often should this kit be replaced?
For preventative maintenance, it is recommended to inspect your water pump impeller annually and replace it every 1-2 years or 100-200 hours of operation, whichever comes first. Frequency should increase if operating in saltwater or sandy/silty conditions.
What makes this different from an OEM kit?
This is a high-quality aftermarket kit designed to meet or exceed OEM specifications using comparable materials. It offers a cost-effective alternative to original manufacturer parts without sacrificing performance or durability.
Will this fit my motor if my year/model isn't listed?
To guarantee compatibility, please verify that your engine's horsepower, model, and year are explicitly listed in the compatibility table. Do not purchase if your model is not listed, as even small variations can affect fitment.
Is it necessary to replace the entire kit?
Yes, for a reliable repair, it is critical to replace all included components—impeller, gaskets, plate, cup, and seals. Using old gaskets or hardware can lead to leaks and premature failure of the cooling system.
What are the OEM vs. Aftermarket parts?
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.
What are the shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty & return policy?
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.
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