Water Pump Impeller Kit – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933, 390770, 396932, 391635, 777808)

$52.00

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Water Pump Impeller Kit – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933, 390770, 396932, 391635, 777808) 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 – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933) is a complete service kit for Johnson/Evinrude outboard engines from 35 HP to 60 HP (2-Stroke), covering models from 1979 to 1994. It provides all necessary components to restore your engine's cooling system performance.

It serves as a direct cross-reference for Johnson/Evinrude part numbers 439077, 396933, 390770, 396932, 391635, 777808; Sierra 18-3399; and Mallory 9-48204, 9-48207.

Engineered for direct OEM replacement and installation.
Includes a new marine-grade metal alloy housing for corrosion resistance.
Features a high-performance neoprene rubber impeller with 6 blades for efficient water flow.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
Johnson/Evinrude	439077
Johnson/Evinrude	396933
Johnson/Evinrude	390770
Johnson/Evinrude	396932
Johnson/Evinrude	391635
Johnson/Evinrude	777808
Sierra	18-3399
Mallory	9-48204
Mallory	9-48207

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Fitment is for specific Johnson/Evinrude models. Please check your HP, year, and serial number range carefully.

Brand	Rated HP	Stroke	Years	OEM Part No.	Notes
Johnson/Evinrude	35	2-Stroke	1986–1987	439077
Johnson/Evinrude	40	2-Stroke	1984–1988	439077	Not for models with Lever Operated Gas Assist Tilt
Johnson/Evinrude	45	2-Stroke	1986–1994	439077
Johnson/Evinrude	45 Commercial	2-Stroke	1986–1988, 1990–1994	439077
Johnson/Evinrude	48	2-Stroke	1987–1988	439077
Johnson/Evinrude	50	2-Stroke	1979–1988	439077	Not for models with Lever Operated Gas Assist Tilt
Johnson/Evinrude	55	2-Stroke	1979–1981, 1983–1984, 1986–1994	439077
Johnson/Evinrude	55 Commercial	2-Stroke	1986–1988, 1990–1994	439077
Johnson/Evinrude	60	2-Stroke	1979–1988	439077	Not for models with Lever Operated Gas Assist Tilt

Technical Specs

Product Type: Water Pump Impeller Service Kit with Housing
Installation: Direct OEM replacement
Housing Material: Marine-grade metal alloy, corrosion resistant
Housing Color: Silver/Gray
Other Technical Attributes: High-performance neoprene rubber impeller with 6 blades
Warranty: Varies by seller (typically 6 months to 1 year)

What’s in the Box

1 x Water Pump Housing (384087)
1 x Impeller (396809)
1 x Wear Plate (320981)
1 x Gasket (336530)
1 x O-Ring (303059)
1 x Grommet (315837)
2 x Screw, Short (319126)
2 x Screw, Long (909533)
1 x Seal (315748)

Installation Notes

Disconnect the battery and shift the outboard into neutral.
Remove the lower unit (gearcase) by unbolting it from the engine's midsection.
Unscrew the bolts on the old water pump housing and remove the assembly.
Clean the driveshaft and housing mating surfaces thoroughly, removing any old gasket material.
Install the new wear plate, gasket, and impeller. Lightly lubricate the impeller and housing interior with marine grease.
Assemble the new housing and components, ensuring the impeller key is correctly seated on the driveshaft.
Tighten the housing bolts to the manufacturer's recommended torque specifications.
Reinstall the lower unit, ensuring the water tube and driveshaft align correctly, and secure it.
Once reassembled, reconnect the battery and test the engine in water, verifying a strong stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I know if my water pump impeller is failing?

Common signs of a worn or damaged impeller include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or finding brittle, cracked, or melted impeller blades during a visual inspection.

What is the recommended replacement interval for this kit?

As a best practice, inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, whichever comes first. Usage in saltwater or silty/sandy conditions may require more frequent changes.

Will this kit fit an engine with Lever Operated Gas Assist Tilt?

No. As noted in the compatibility table, this specific kit is not designed for models equipped with the Lever Operated Gas Assist Tilt system. Please confirm your engine’s features before purchasing to ensure correct fitment.

Is any special lubricant needed for installation?

Yes, it's highly recommended to apply a light coat of marine-grade grease or a soap-and-water solution to the interior of the pump housing and the impeller blades. This prevents damage to the impeller during the first dry start-up before water circulates.

OEM vs. Aftermarket Parts?

This listing is for a high-quality aftermarket replacement part, not an OEM component. It is built to meet or exceed OEM-level specifications using comparable materials and is manufactured in an ISO 9002 certified facility with batch inspections to ensure consistency and reliability.

What are the shipping speed and cost?

We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free for all orders. Expedited shipping options, if available for your location, will be presented at checkout.

What is the warranty and return policy?

This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their 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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