Water Pump Repair Kit – Fits Johnson/Evinrude 35-60 HP (Replaces 439077, 396933, 18-3399)

$62.00 $99.00

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Water Pump Repair Kit – Fits Johnson/Evinrude 35-60 HP (Replaces 439077, 396933, 18-3399) is backordered and will ship as soon as it is back in stock.

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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).

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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 Repair Kit – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933, 18-3399) restores cooling system performance on a wide range of Johnson and Evinrude 2-stroke outboard motors from 35 HP to 60 HP, covering model years 1978–1997.

It serves as a direct replacement for Johnson/Evinrude OEM parts 439077 and 396933, as well as aftermarket equivalents Sierra 18-3399, GLM 12100, and MARKGOO 0439077.

Engineered as a direct OEM-equivalent fit.
Constructed with a marine-grade corrosion-resistant metal alloy housing and a high-performance neoprene rubber impeller for durability.
Requires lubrication with silicone grease, glycerin, or dish soap during installation to ensure proper function (lubricant not included).

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	439077
Johnson/Evinrude	396933
Sierra	18-3399
GLM	12100
MARKGOO	0439077

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This kit is designed for specific Johnson and Evinrude 2-stroke outboards. Always verify your engine's horsepower, year, and original part number before ordering.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	Outboards	35	2-Stroke	1978–1997	439077, 396933
Johnson/Evinrude	Outboards	40	2-Stroke	1978–1997	439077, 396933
Johnson/Evinrude	Outboards	45	2-Stroke	1978–1997	439077, 396933
Johnson/Evinrude	Outboards	48	2-Stroke	1978–1997	439077, 396933
Johnson/Evinrude	Outboards	50	2-Stroke	1978–1997	439077, 396933
Johnson/Evinrude	Outboards	55	2-Stroke	1978–1997	439077, 396933
Johnson/Evinrude	Outboards	60	2-Stroke	1978–1997	439077, 396933

Technical Specs

Product Type: Water Pump Repair Kit with Housing
Installation: Direct OEM replacement
Housing Material: Marine-grade corrosion resistant metal alloy
Impeller Material: High-performance neoprene rubber
Product Dimensions: 16.0" L x 12.5" W x 12.5" H
Other Technical Attributes: Requires lubrication with silicone grease, glycerin, or dish soap during installation (not included)

What’s in the Box

1 x Water Pump Housing Assembly
1 x Impeller

Installation Notes

Disconnect the negative battery cable for safety.
Remove the lower unit (gearcase) from the outboard motor. This typically involves unbolting it from the driveshaft housing.
Unscrew the bolts securing the water pump housing and remove the old housing, impeller, and gaskets.
Thoroughly clean the mating surfaces, removing any old gasket material or sealant.
Lightly lubricate the new impeller and the inside of the new housing with silicone grease, marine grease, or dish soap.
Install the new components in the reverse order of removal, ensuring the impeller key is correctly aligned.
Re-install the lower unit, reconnect the battery, and test the engine using a water supply (flushing muffs) to confirm water is pumping correctly.

Troubleshooting & FAQ

How do I confirm this kit fits my specific engine model?

The most reliable method is to match your engine's original part number to the ones listed in our Part Number Matrix (439077, 396933). While this kit fits a broad range of 35-60 HP Johnson/Evinrude models from 1978–1997, checking the part number or consulting your service manual is the best way to guarantee compatibility.

What are the signs of a failing water pump?

Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent stream of water from the "telltale" outlet, and in severe cases, an engine alarm. The impeller is a wear item and can become brittle or lose blades over time, reducing its ability to pump water.

How often should a water pump impeller be replaced?

As a general maintenance rule, it is recommended to inspect the impeller annually and replace it every 1–2 years (or every 100-200 hours of use), regardless of its visible condition. Replacement frequency depends on usage (freshwater vs. saltwater) and operating conditions.

Why is lubrication necessary during installation?

Lubricating the impeller and housing prevents damage during the initial "dry start" before water circulates through the pump. A dry impeller can overheat and tear almost instantly. Using silicone grease, glycerin, or simple dish soap is a critical step.

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.

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