Gearcase Seal Kit – Fits Johnson/Evinrude 8, 9.9, 10, & 15 HP (Replaces 0396350, 396350)

Gearcase Seal Kit – Fits Johnson/Evinrude 8, 9.9, 10, & 15 HP (Replaces 0396350, 396350)

This gearcase seal kit contains the necessary components to service the lower unit on a wide range of Johnson and Evinrude outboard motors. It is designed for 9.9, 10, and 15 HP 2-Stroke models (1974–2007) as well as 8, 10, and 15 HP 4-Stroke models (1995–2004).

This kit is a direct replacement for multiple OEM and aftermarket part numbers, providing a reliable solution for preventing water intrusion and maintaining gearcase lubrication.

• Installation Location: Fits the outboard lower unit/gearcase.
• Fuel Compatibility: Designed for use with gasoline engines.
• Complete Kit: Includes a comprehensive set of seals, o-rings, and washers for a full service.

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

1. Position the outboard securely on a stand or with the lower unit easily accessible.
2. Place a suitable oil drain pan beneath the gearcase.
3. Remove the lower drain/fill screw and the upper vent screw, allowing all gear lube to drain completely.
4. Remove the bolts securing the lower unit to the outboard's midsection and carefully detach it.
5. Disassemble the gearcase as required to access the propeller shaft and driveshaft seals.
6. Carefully extract all old seals, o-rings, and washers, taking note of their orientation.
7. Thoroughly clean all sealing surfaces, removing any old sealant, corrosion, or debris.
8. Lightly coat the new seals and o-rings with marine grease before installation.
9. Press the new seals into place using an appropriate driver, ensuring they are seated squarely and to the correct depth.
10. Reassemble the gearcase components according to manufacturer specifications.
11. Reinstall the lower unit onto the outboard, tightening bolts to the specified torque.
12. Fill the gearcase with the recommended gear lube through the bottom hole until it flows from the top vent hole, then install the new washers and screws.

Troubleshooting & FAQ

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

A: This kit fits a wide range of Johnson/Evinrude 2-stroke (1974–2007) and 4-stroke (1995–2004) models. Please review the "Compatible Engine Models" table and cross-reference your engine's model code and year. For further help, use our Johnson/Evinrude Serial Number Guide.

Q: What are the signs that my gearcase seals need replacing?

A: Common signs of failing gearcase seals include milky or water-contaminated gear lube (visible during a drain), oil leaks around the propeller shaft or driveshaft, or a noticeable drop in the gear lube level over time.

Q: How often should I replace my gearcase seals?

A: It is best practice to inspect your gearcase seals during every routine lower unit service or at least once per boating season. You should replace them immediately if you notice any signs of leaks, cracking, or damage to prevent water intrusion and subsequent costly gear damage.

Q: OEM vs. Aftermarket?

A: 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.

Q: How fast do you ship and how much does it cost?

A: 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.

Q: What is your warranty and return policy?

A: 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.