Lower Unit Seal Kit – Fits Johnson Evinrude 85-125 HP (Replaces 18-2691, GLM 87611, Mallory 9-74114)

Lower Unit Seal Kit – Fits Johnson Evinrude 85-125 HP

This lower unit gearcase seal kit is designed for Johnson/Evinrude 85, 100, and 125 HP outboard models (1971–1972) equipped with a large prop shaft. It provides the necessary components to restore seal integrity and prevent water intrusion or oil leaks in the gearcase.

This kit is a direct replacement for several OEM and aftermarket part numbers, including Sierra 18-2691, GLM 87611, and Mallory 9-74114.

• Complete Kit: Includes all necessary oil seals, O-rings, and gaskets for a lower unit overhaul.
• Direct Replacement: Engineered to match OEM specifications for a precise fit and reliable function.
• Application: Specifically designed for select 1971–1972 Johnson/Evinrude outboard motors.

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

• Oil Seals (Various sizes)
• O-rings (Various sizes)
• Gaskets (Various types)

Installation Guide

1. Ensure the engine is off and securely positioned in a stand or on the vessel.
2. Drain the gearcase oil completely by removing the drain and vent plugs.
3. Remove the propeller assembly from the propshaft.
4. Unbolt and carefully separate the entire gearcase (lower unit) from the outboard's midsection.
5. Disassemble the lower unit to access the propeller shaft bearing housing, driveshaft, and shift shaft seals. Keep parts organized.
6. Carefully remove all old seals, O-rings, and gaskets. Clean the component surfaces of any sealant, corrosion, or debris.
7. Compare the new seals from the kit to the old parts to confirm correct sizing and placement.
8. Lightly lubricate the new seals with marine grease before carefully pressing them into place. Ensure they are seated correctly.
9. Install the new gaskets and O-rings during reassembly.
10. Reassemble the lower unit, torquing all bolts to the manufacturer's specified values.
11. Refill the gearcase with the correct grade and amount of fresh marine gear lube.
12. Check for any leaks around the drain plugs, shafts, and seams before operating the engine under load.

Troubleshooting & FAQ

Q: How do I confirm this seal kit fits my Johnson/Evinrude engine?
A: This kit is specifically for 85-125 HP models from 1971-1972 with a large prop shaft. The best way to confirm fitment is to cross-reference your original part number with the ones listed, such as Sierra 18-2691, GLM 87611, or Mallory 9-74114.

Q: What are the signs that my lower unit seals are failing?
A: The most common symptoms are milky or water-contaminated gear oil (which looks like coffee with cream), visible oil leaks from the propeller shaft area, or a distinct burning smell coming from the gearcase after operation.

Q: How often should I replace the lower unit seals?
A: There is no fixed replacement interval. Seals should be replaced whenever the lower unit is serviced, if you notice any signs of leaks or water intrusion, or as a part of preventative maintenance on older engines.

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.