Outboard Oil Seal Kit – Fits Mercury (30-150HP), Honda BF75/90 (Replaces 8M0205729, 91255-ZW1-003)

Outboard Oil Seal Kit – Fits Mercury (30-150HP), Honda BF75/90 (Replaces 8M0205729, 91255-ZW1-003)

This aftermarket propeller shaft oil seal kit is designed for a range of Mercury and Honda outboard lower units. It provides a direct replacement for original parts to prevent gear lube leakage and water intrusion.

This kit directly replaces Mercury part numbers 26-70081 and 8M0205729, Honda part number 91255-ZW1-003, Sierra 18-2053, Mallory 9-76115, and GLM 85530.

• Installation Method: Direct press-in fit.
• Key Feature: Dual-lip design for primary sealing and external dust protection.
• Package Includes: Two individual oil seals.

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.

For Honda applications, confirm your engine model/year in the table below.

Mercury/Mercruiser Applications

Honda Marine Applications

Technical Specifications

Package Contents

• 2 x Oil Seals (Replaces 91255-ZW1-003 / 8M0205729)

Installation Guide

1. Safety First: Disconnect the engine's battery and ensure the engine is secure.
2. Drain Gear Lube: Place a drain pan under the lower unit and remove the upper and lower drain screws to drain the gear lube completely.
3. Remove Propeller Assembly: Remove the cotter pin, propeller nut, and slide the propeller and associated hardware off the propeller shaft.
4. Remove Bearing Carrier: Depending on your model, remove the bolts securing the propeller shaft bearing carrier housing. A puller tool may be required to extract the carrier.
5. Extract Old Seals: Carefully pry out the old oil seals from the bearing carrier, taking care not to scratch or damage the housing bore. Note the orientation of each seal.
6. Clean and Prepare: Thoroughly clean the seal housing bore to remove any old sealant, corrosion, or residue.
7. Install New Seals: Apply a thin coat of marine grease to the outer diameter of the new seals. Using a seal driver or a socket of the correct size, press the new seals into the housing until they are fully seated. Ensure they are installed in the correct orientation (primary sealing lip facing the oil).
8. Reassemble: Reinstall the bearing carrier, propeller assembly, and refill the lower unit with fresh marine gear lube according to the manufacturer's specifications.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?

A: This kit is designed for a wide range of Mercury outboards (30-150HP, 1987-present) and specific Honda models (BF75/90, 1997-1998). Please check the "Compatible Engine Models" and "Part Number Cross-Reference" tables. For Mercury owners, using our linked serial number guide can help confirm your exact model.

Q: What are the signs my propeller shaft seals are failing?

A: Common signs of a failing seal include visible gear lube leaking from the propeller area, water intrusion into the gearcase (which makes the oil look milky or cloudy), or finding fishing line tightly wrapped around the shaft, which can cut and damage the seal.

Q: How often should I replace these seals?

A: We recommend inspecting your propeller shaft seals annually or whenever you service your lower unit. They should be replaced immediately if you notice any signs of wear, damage, or leakage. It is also good practice to replace them proactively during a major service, such as a water pump replacement.

Q: What is the benefit of the dual-lip design?

A: The dual-lip design provides superior protection. The inner (primary) lip seals the gear lube in, while the outer (secondary) lip acts as a dust and debris shield, preventing external contaminants like fishing line, grit, and sand from damaging the primary seal.

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.