0396349 Lower Unit Seal Kit for Johnson Evinrude | JLM Marine

Lower Unit Seal Kit for Johnson Evinrude Outboards – 0396349

This lower unit seal kit is engineered to fit a wide range of Johnson and Evinrude outboard motors, including 40–75 HP 3-cylinder models (1975–2001) and 40–60 HP E-TEC engines (2004–2008). Designed to restore watertight integrity to your gearcase, this kit provides reliable protection against water intrusion and oil leakage in demanding marine environments.

This aftermarket replacement directly crosses to OMC 0396349, 5000309, 0777558, Sierra 18-2660, GLM 87601, and Mallory 9-74103, ensuring broad compatibility across OEM and aftermarket service parts.

• Complete seal kit for lower unit gearcase service
• Fits both standard 3-cylinder and E-TEC models
• Direct cross-reference to multiple OEM and aftermarket part numbers

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

This kit includes:

• 1 x Lower Unit Seal Kit (all seals as shown in product image)

Installation Guide

1. Disconnect the battery and remove the propeller for safety.
2. Drain all gear oil from the lower unit and clean the exterior surfaces.
3. Remove the lower unit from the motor following your service manual instructions.
4. Disassemble the gearcase, keeping track of shims and bearing positions.
5. Remove all old seals, O-rings, and gaskets from the housing and shafts.
6. Clean all seal surfaces thoroughly with marine-grade solvent and inspect for damage.
7. Lubricate new seals with marine grease and install them carefully using the correct drivers.
8. Reassemble the gearcase, ensuring proper shimming and bearing preload per service specifications.
9. Reinstall the lower unit onto the motor and torque all fasteners to manufacturer specs.
10. Refill with the correct grade and quantity of lower unit gear oil.
11. Check for leaks by running the motor in a test tank or on muffs for several minutes.
12. Reinstall the propeller and perform a water test under normal operating conditions.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Johnson or Evinrude engine?
A: Check the Compatible Engine Models table above for your HP rating and year range. You can also verify by cross-referencing your original OEM part number (0396349, 5000309, 0777558) or aftermarket equivalents (Sierra 18-2660, GLM 87601, Mallory 9-74103) against this kit.

Q: How often should I replace my lower unit seals?
A: Replace seals whenever you service the lower unit, typically every 2–3 years or 100–200 hours of operation, or immediately if you notice milky gear oil or signs of water intrusion.

Q: What are the signs that my lower unit seals are failing?
A: Common symptoms include milky or discolored gear oil, excessive oil consumption, water in the gearcase, unusual noise or vibration from the lower unit, and visible oil leaks around the propeller shaft or shift shaft.

Q: Can I reuse old seals during lower unit service?
A: No. Seals are designed for single use and lose their sealing ability once removed. Always install new seals during gearcase service to prevent leaks and potential 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.