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) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Outboard Oil Seal Kit – Fits Mercury (30-150HP), Honda BF75/90 (Rep...
Product Details
This Outboard Oil Seal Kit is an essential component for maintaining the lower unit of various Mercury/Mercruiser outboards (30-150HP, 1987-present) and specific Honda Marine 4-stroke models, including the BF75 (1997-1998) and BF90 (1997-1998) series. It is designed to prevent water intrusion and gear lube leakage from the propeller shaft.
The kit provides a direct interchange for Mercury part numbers 26-70081 and 8M0205729, Honda 91255-ZW1-003, and aftermarket equivalents like Sierra 18-2053, Mallory 9-76115, and GLM 85530.
- Installation Method: Installs via a direct press-in fit into the bearing carrier.
- Durable Design: Features a dual-lip nitrile rubber housing for primary sealing and excellent protection against dust and debris.
- Complete Set: Includes two propeller shaft oil seals required for a typical replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 26-70081 | Superseded by 8M0205729 |
| Mercury | 8M0205729 | — |
| Honda Marine | 91255-ZW1-003 | — |
| Sierra | 18-2053 | Aftermarket Interchange |
| Mallory | 9-76115 | Aftermarket Interchange |
| GLM | 85530 | Aftermarket Interchange |
| Force/US Marine | 26-70081 | — |
Engine & Model Compatibility
Confirm your engine model and year in the tables below to ensure proper fitment.
Mercury/Mercruiser Applications: This seal kit fits a broad range of outboards. Verify your OEM part number is 26-70081 or 8M0205729.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Various Models | 30–150 | 4-Stroke | 1987–Present | 26-70081 / 8M0205729 | Part 26-70081 superseded by 8M0205729 |
Honda Marine Applications: Fits specific BF75 and BF90 models from 1997–1998.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Honda | BF75AT (LHTA, LRTA & XRTA) | 75 | 4-Stroke | 1997 | 91255-ZW1-003 |
| Honda | BF75AW (LHTA, LRTA & XRTA) | 75 | 4-Stroke | 1998 | 91255-ZW1-003 |
| Honda | BF90AT (LHTA, LRTA & XRTA) | 90 | 4-Stroke | 1997 | 91255-ZW1-003 |
| Honda | BF90AW (LHTA, LRTA & XRTA) | 90 | 4-Stroke | 1998 | 91255-ZW1-003 |
Technical Specs
- Product Type
- Propeller Shaft Oil Seal Kit
- Installation
- Direct replacement
- Connection
- Pressed fit
- Housing Material
- Nitrile rubber
- Housing Color
- Black
- Dimensions
- O.D.: 45mm (1.754"), Shaft Size: 30mm (1.185"), Width: 9.1mm (0.360")
- Weight
- 41g (0.09 lbs)
- Fitting Type
- Press-in seal
- Operating Temperature
- -30°C to 120°C (-22°F to 248°F)
- Other Technical Attributes
- Dual-lip design: primary sealing and dust protection
What’s in the Box
- 2 x Oil Seals (Replaces 91255-ZW1-003 / 8M0205729)
Installation Notes
- Drain the gearcase lubricant completely into a suitable container.
- Remove the propeller, thrust washer, and any associated hardware.
- Unbolt and remove the bearing carrier assembly, which houses the seals. A slide hammer or carrier puller tool is often required.
- Carefully inspect the bearing carrier and propeller shaft for scoring, grooves, or damage. Address any issues before proceeding.
- Use a seal puller or press to remove the old oil seals from the carrier. Note their orientation and depth before removal.
- Thoroughly clean the seal seating bore inside the carrier, removing all old sealant and debris.
- Apply a thin film of marine grease to the outer edge of the new seals and the inner surface of the carrier bore.
- Press the new seals into the carrier using a seal driver or press. Ensure they are seated squarely, to the correct depth, and in the proper orientation (lips facing the correct direction).
- Reinstall the bearing carrier with new O-rings or gaskets, torquing bolts to manufacturer specifications.
- Reinstall the propeller assembly and refill the gearcase with the correct type and amount of specified lubricant.
- It is highly recommended to pressure-test the gearcase to confirm a proper seal before returning the engine to service.
Troubleshooting & FAQ
How can I confirm this kit fits my Mercury engine?
This kit is listed for a wide range of Mercury/Mercruiser outboards from 30HP to 150HP (1987-Present). The most reliable way to confirm is to verify your original part number is 26-70081 or its replacement, 8M0205729. Additionally, comparing the dimensions (O.D.: 45mm, Shaft Size: 30mm, Width: 9.1mm) to your old seals is a crucial verification step.
Are these seals compatible with all Honda BF75 and BF90 models?
No, compatibility is specific. This kit is confirmed to fit Honda BF75 and BF90 outboard models from the years 1997 and 1998 only (AT and AW series). Please check your engine's serial number plate for the exact model and year before ordering.
What are the signs of a failed propeller shaft seal?
Common symptoms include a milky or cloudy appearance in your gear lube (indicating water contamination), an oil sheen on the water's surface around your propeller, or visible gear oil dripping from the prop shaft area. A failed pressure test of the lower unit is a definitive sign of a leak.
How often should these seals be replaced?
There is no fixed replacement interval. It is best practice to inspect the seals for damage or leaks whenever the gear lube is changed or the propeller is removed. As a preventative measure, consider replacing them if they are several years old or if you frequently operate in sandy/silty water or around fishing line.
What is the benefit of the dual-lip design?
The inner lip is the primary seal that retains gear oil inside the lower unit. The outer lip functions as an excluder seal, which helps prevent external contaminants like fishing line, sand, and grit from reaching and damaging the primary sealing lip, thereby extending its service life.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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