Lower Unit Seal Kit – Fits Johnson Evinrude 85-115 HP V4 Outboards

Lower Unit Seal Kit – Fits Johnson Evinrude 85-115 HP V4 Outboards

This complete lower unit seal kit is designed for Johnson/Evinrude 85, 90, 100, 110, and 115 HP V4 2-Stroke Crossflow outboards manufactured between 1973 and 1983. It provides all the necessary components to rebuild your gearcase and prevent water intrusion or oil leaks.

This kit is a direct replacement for several aftermarket part numbers, ensuring broad compatibility for your lower unit repair needs.

• Application: Complete lower unit/gearcase rebuild for preventing leaks.
• Engine Compatibility: Fits a wide range of V4 Crossflow outboards from 1973–1983.
• Direct Replacement: Replaces popular Sierra, GLM, and Mallory seal kits.

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 comprehensive kit includes all the necessary seals, gaskets, and O-rings for a complete lower unit service:

• 1 x Shift Housing Gasket (Replaces 18-0110)
• 2 x Oil Seal (Replaces 18-2001)
• 2 x Oil Seal (Replaces 18-2026)
• 1 x Solenoid Cover Gasket (Replaces 18-2874)
• 2 x Drain/Fill Plug Washer (Replaces 18-4248)
• 4 x O-Ring (Replaces 18-7109)
• 1 x O-Ring (Replaces 18-7120)
• 1 x O-Ring (Replaces 18-7127)
• 1 x O-Ring (Replaces 18-7130)
• 1 x O-Ring (Replaces 18-7137)

Installation Guide

1. Drain Gearcase Oil: Position the outboard vertically and remove the upper and lower drain/fill screws. Let all oil drain completely.
2. Remove Lower Unit: Disconnect the shift linkage (if applicable) and remove the bolts securing the lower unit to the outboard's midsection.
3. Disassemble Gearcase: Carefully disassemble the lower unit components, including the propeller shaft housing and driveshaft bearing housing, to access the old seals.
4. Remove Old Seals & Gaskets: Take out all old O-rings, seals, and gaskets that are being replaced by this kit. Note their orientation.
5. Clean Surfaces: Thoroughly clean all mating surfaces and seal cavities. Ensure they are free of old sealant, corrosion, and debris.
6. Install New Components: Lightly lubricate the new oil seals and O-rings with marine grease. Carefully press them into place, ensuring they are seated correctly and evenly.
7. Reassemble Lower Unit: Reassemble the gearcase components in the reverse order of disassembly. Ensure all parts are correctly aligned.
8. Torque to Spec: Tighten all bolts and fasteners to the manufacturer's recommended torque specifications to prevent leaks.
9. Refill with Oil: Install a new washer on the lower drain plug. Fill the gearcase with fresh lower unit oil from the bottom hole until it emerges from the top hole. Install the top plug, then the bottom plug.
10. Check for Leaks: After refilling, allow the unit to sit for several hours and inspect for any signs of oil leakage before operating the engine.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This kit is specifically for Johnson/Evinrude 85-115 HP V4 Crossflow outboards from 1973 to 1983. The best way to confirm fitment is to match your model and year from the compatibility table or cross-reference your old part numbers with Sierra 18-2692, GLM 86712, or Mallory 9-74113.

What are the signs that my lower unit seals are failing?
The most common signs are finding milky or creamy gear lube (which indicates water has mixed with the oil), discovering an oil sheen on the water surface around your outboard, or noticing visible oil leaking from the propeller shaft area.

How often should lower unit seals be replaced?
While there is no strict replacement interval, it is recommended to inspect for leaks annually. Seals should be replaced immediately if you find water in the gear oil. It is also standard practice to install a new seal kit whenever performing major service like a water pump replacement or a full gearcase rebuild.

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. Improper installation can lead to gearcase failure.

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.