Lower Unit Seal Kit – Fits Johnson/Evinrude 35-75HP 1975-1988 (Replaces 0396355, 0777562)

Lower Unit Seal Kit – Fits Johnson/Evinrude 35-75HP 1975-1988 (Replaces 0396355, 0777562)

This lower unit seal kit is designed for Johnson/Evinrude 35-75HP outboard engines from 1975-1988, including both 2-cylinder and 3-cylinder models equipped with the small gearcase. It provides a complete solution for replacing old, leaking, or damaged seals in your engine's lower unit.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Sierra 18-2659, GLM 87603, Mallory 9-74102, WSM 446-102, and Johnson/Evinrude 0396355 / 0777562.

• Comprehensive Kit: Includes all necessary seals, gaskets, o-rings, and washers for a lower unit rebuild.
• Durable Materials: Components are made from corrosion-resistant materials to withstand harsh marine environments.
• Installation: Professional installation is recommended to ensure proper fit and function.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Technical Specifications

Package Contents

• 1 x Impeller Housing Gasket (18-0969)
• 1 x Oil Seal (18-2059)
• 2 x Oil Seal (18-2060)
• 1 x Oil Seal (18-2064)
• 1 x Gearcase Cover Seal (18-2532)
• 1 x Exhaust Leg Seal (18-2537)
• 1 x Shift Housing Gasket (18-2855)
• 2 x Drain/Fill Plug Washer (18-4248)
• 1 x O-Ring (18-7115)
• 1 x O-Ring (18-7120)
• 1 x O-Ring (18-7137)
• 1 x O-Ring (18-7140)
• 2 x O-Ring (18-7145)
• 3 x O-Ring (18-7475)

Installation Guide

Professional installation is highly recommended. The general steps for replacing lower unit seals are as follows:

1. Drain Gear Lube: Completely drain the old lubricant from the gearcase by removing the drain/fill screws.
2. Remove Lower Unit: Detach the lower unit from the outboard engine's exhaust housing.
3. Disassemble Components: Remove the water pump assembly and driveshaft bearing housing to access the old seals.
4. Extract Old Seals: Carefully remove all old seals and o-rings, taking care not to scratch the housing surfaces.
5. Clean and Inspect: Thoroughly clean all sealing surfaces and inspect components for wear or damage.
6. Install New Seals: Using appropriate seal drivers, install the new seals and o-rings. Ensure they are seated correctly and apply a light coat of marine grease.
7. Reassemble: Reinstall the bearing housing and water pump with the new gaskets.
8. Reinstall Lower Unit: Mount the lower unit back onto the engine, ensuring the driveshaft, water tube, and shift shaft are properly aligned.
9. Refill with Lube: Fill the gearcase with the manufacturer-specified lower unit lubricant until it flows out of the upper vent hole. Reinstall and tighten both screws with new washers.

Troubleshooting & FAQ

How can I be sure this seal kit fits my Johnson 70HP engine?
This kit is designed for Johnson/Evinrude 35-75HP engines (1975-1988) with the small gearcase. While it fits most models in this range, we strongly recommend checking your specific engine part number against our cross-reference list (0396355, 0777562). Some variations exist, particularly for specific 70HP models, so visual comparison with your old seals before installation is also a good practice.

What are the common signs of a failing lower unit seal?
Key indicators include milky, water-contaminated gear lube (which looks like coffee with cream) when you drain it, visible oil leaking from the propeller shaft or driveshaft area, or a recurring loss of gear lube. Any of these symptoms suggest it's time to inspect and replace the seals.

Do I need special tools for this installation?
While disassembly can be performed with standard mechanic's tools, correctly installing seals without damaging them often requires specific tools like seal drivers and pullers. To prevent leaks and ensure a lasting repair, professional installation is strongly recommended if you are not experienced with lower unit service.

OEM vs. Aftermarket?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.