Shift Shaft Lower Unit Gearcase Oil Seal – Fits Mercury Marine 60-225 HP & Yamaha 30-300 HP (Replaces 26-82257M, 93106-09014-00)

Shift Shaft Lower Unit Gearcase Oil Seal – Fits Mercury Marine 60-225 HP & Yamaha 30-300 HP

This gear housing oil seal is an aftermarket replacement component for a wide range of Mercury Marine and Yamaha outboard motors. It is specifically designed to create a tight seal, preventing lubricant leaks from the gearcase and protecting internal components from water intrusion.

This seal fits various 2-stroke and 4-stroke models, including Mercury Marine engines from 60 to 225 HP and Yamaha engines from 30 to 300 HP. It serves as a direct replacement for multiple OEM and aftermarket part numbers.

• Installation Type: Direct OEM replacement
• Function: Seals the shift shaft or gear housing to prevent oil leaks and water contamination
• Material: Durable Rubber/Metal composite designed for saltwater resistance

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 Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Oil Seal (Replaces 26-82257M / 93106-09014-00)

Installation Guide

1. Prepare the Lower Unit: Position the outboard securely and place a drain pan under the lower unit. Remove the drain and vent screws to drain the gear lube completely.
2. Remove Lower Unit: Disconnect the shift linkage and remove the mounting bolts securing the gearcase to the engine. Carefully lower the unit.
3. Access the Seal: Depending on your model, the shift shaft seal may be located at the top of the gearcase. Identify the old seal that needs replacement.
4. Remove the Old Seal: Use a seal puller or a flat-head screwdriver to carefully pry the old seal out of its housing. Take care not to scratch or damage the housing surface.
5. Clean the Housing: Thoroughly clean the seal housing area to remove any old sealant, corrosion, or debris.
6. Install the New Seal: Lightly lubricate the outer edge of the new seal with marine grease. Use a seal driver or a socket of the appropriate size to press the new seal evenly into place until it is fully seated.
7. Reassemble the Lower Unit: Reattach the lower unit to the engine, ensuring the shift linkage, driveshaft, and water tube are properly aligned. Torque all bolts to manufacturer specifications.
8. Refill Gear Lube: Fill the gearcase with the recommended marine gear lube through the drain hole until it flows out of the vent hole. Reinstall the vent and drain screws with new gaskets.
9. Check for Leaks: After running the engine, check the seal area for any signs of oil leaks.

Troubleshooting & FAQ

Q: How do I confirm this seal fits my engine?

A: The best method is to match the part number from your old seal or service manual to the numbers in our Part Number Cross-Reference table. Additionally, check the Compatible Engine Models list. For precise verification on Mercury and Yamaha engines, we highly recommend using the serial number and parts diagram guides linked above.

Q: What are the common signs of a failing gearcase oil seal?

A: The most common indicators are visible oil leaks around the lower unit or a milky, emulsified appearance in your gear lube when you drain it, which signifies water contamination.

Q: Is this an OEM part?

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.