Gearcase Lower Unit Seal Kit – Fits Johnson/Evinrude 8–15 HP Outboards (Replaces 0396350, 0777568)

Gearcase Lower Unit Seal Kit – Fits Johnson/Evinrude 8–15 HP Outboards (Replaces 0396350, 0777568)

This gearcase lower unit seal kit is designed for Johnson/Evinrude 8–15 HP 2-Stroke (1974–2007) and 4-Stroke (1995–2004) outboard boat motors. It provides the necessary components to restore a watertight seal and prevent gear lube leaks.

This kit is a direct replacement for Johnson/Evinrude OEM part numbers 0396350 and 0777568, along with several other aftermarket equivalents. It is manufactured in an ISO 9001/9002 certified facility to meet or exceed original equipment specifications.

• Includes a comprehensive set of seals, o-rings, and washers for a complete repair.
• Engineered as a direct replacement for a precise fit.
• Professional installation is recommended for optimal performance and safety.

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 Oil Seal (0318972)
• 1 x Oil Seal (0321480)
• 1 x Oil Seal (0342247)
• 1 x Drain/Fill Plug Washer (0311598)
• 1 x O-Ring (0301877)
• 1 x O-Ring (0308627)
• 1 x O-Ring (0307853)
• 1 x O-Ring (0319085)
• 1 x Washer (0332584)
• 1 x Fill and Drain Plug Screw (0307551)
• 1 x Shift Rod Washer (0321738)

Installation Guide

Professional installation is highly recommended. The following are general steps and may not apply to all models.

1. Drain the Gear Lube: Position the engine vertically and place a drain pan under the lower unit. Remove the lower and upper drain/fill screws to drain the lubricant completely.
2. Remove Propeller Assembly: Remove the cotter pin, propeller nut, and any washers. Carefully slide the propeller off the shaft.
3. Remove the Gearcase: Disconnect the shift linkage and remove the bolts securing the gearcase to the engine's midsection. Carefully lower the gearcase assembly.
4. Disassemble and Inspect: Take the gearcase to a clean workbench. Disassemble the unit, paying close attention to the location of all seals, o-rings, and bearings.
5. Replace Seals and O-Rings: Carefully remove the old seals and o-rings from their respective bores, taking care not to scratch the housing surfaces. Clean the sealing surfaces thoroughly.
6. Install New Seals: Lubricate the new seals with a small amount of marine grease. Use a seal driver or an appropriately sized socket to press the new seals into place until they are properly seated.
7. Reassemble the Gearcase: Reassemble the internal components in reverse order of disassembly. Ensure all parts are correctly aligned and torqued to manufacturer specifications.
8. Reinstall Gearcase and Propeller: Reattach the gearcase to the engine and reconnect the shift linkage. Reinstall the propeller assembly with a new cotter pin.
9. Refill with Gear Lube: Fill the gearcase with the manufacturer-recommended lubricant through the bottom hole until it flows out of the top hole. Reinstall the top screw first, then the bottom screw.

Troubleshooting & FAQ

How do I confirm this fits my engine?
Verify that your engine's horsepower, stroke, and year fall within the ranges listed in the compatibility table. Double-check the OEM part numbers (0396350, 0777568) against your service manual or existing part for an exact match.

What are the signs my gearcase seals are failing?
The most common sign is milky or cloudy gear lube, which indicates water intrusion. Other symptoms include visible oil leaks around the propeller shaft or drain plugs, or a burnt smell from the lower unit.

Is this a complete kit for the lower unit?
Yes, this seal kit includes a comprehensive set of seals, washers, and O-rings required for a standard lower unit reseal. Please review the 'Package Contents' section for a complete list of included components.

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.