Water Pump Impeller Kit – Fits Johnson/Evinrude 4-8 HP 1980+ (Replaces 396644, 0396644)

$56.99

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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.

Worry-free returns

You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

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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