Propeller Shaft Oil Seal – Fits Mercury Marine 30-150 HP, Honda Marine 75-90 HP (Replaces 26-70081, 8M0205729, 91255-ZW1-003)
Propeller Shaft Oil Seal – Fits Mercury Marine 30-150 HP, Honda Marine 75-90 HP (Replaces 26-70081, 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
Orders are typically processed within 1–2 business days.
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Propeller Shaft Oil Seal – Fits Mercury Marine 30-150 HP, Honda Mar...
Propeller Shaft Oil Seal – Fits Mercury Marine 30-150 HP, Honda Marine 75-90 HP (Replaces 26-70081, 8M0205729, 91255-ZW1-003) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Propeller Shaft Oil Seal is designed for a wide range of Mercury Marine 30-150 HP outboards (2-Stroke & 4-Stroke, 1978 and newer) and Honda Marine 75-90 HP 4-Stroke outboards. It installs externally on the gear housing to prevent gear lube from leaking out and water from entering the lower unit, ensuring the longevity and performance of your engine's gearcase.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 26-70081 and 8M0205729, Sierra 18-2053, and Honda 91255-ZW1-003.
- Installs externally on the lower unit gear housing.
- Features a durable rubber and metal case construction with a press-fit design.
- Incorporates a spring-loaded lip to maintain a secure seal around the propeller shaft.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury Marine | 26-70081 | 8M0205729 |
| Mercury Marine | 8M0205729 | |
| Force | 26-70081 | |
| Sierra | 18-2053 | |
| Honda Marine | 91255-ZW1-003 | |
| GLM | 85530 | |
| Mallory | 9-76115 | |
| Mallory | 9-76116 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This seal fits a broad range of Mercury, Mariner, and Force outboards from 1978 to present, as well as select Honda models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 30 HP Carb 3 CYL | 30 | 2-Stroke | 1978–2005 | 26-70081/8M0205729 | |
| Mercury | 40 HP (Carb/EFI) | 40 | 2-Stroke & 4-Stroke | 1978–2018 | 26-70081/8M0205729 | Includes 3 & 4 CYL variants |
| Mercury | 45 HP BODENSEE/JET | 45 | 2-Stroke | 1978–2005 | 26-70081/8M0205729 | |
| Mercury | 50 HP (3 & 4 CYL) | 50 | 2-Stroke & 4-Stroke | 1978–2018 | 26-70081/8M0205729 | Includes BIGFOOT models |
| Mercury | 55 HP (3 CYL) | 55 | 2-Stroke | 1978–2005 | 26-70081/8M0205729 | |
| Mercury | 60 HP (3 & 4 CYL) | 60 | 2-Stroke & 4-Stroke | 1978–2018 | 26-70081/8M0205729 | Includes BIGFOOT models |
| Mercury | 65 JET | 65 | 2-Stroke | 1978–2005 | 26-70081/8M0205729 | |
| Mercury | 70 HP (3 CYL) | 70 | 2-Stroke | 1978–2005 | 26-70081/8M0205729 | |
| Mercury | 75 HP (3 & 4 CYL) | 75 | 2-Stroke & 4-Stroke | 1978–2018 | 26-70081/8M0205729 | Includes 1.5L models |
| Mercury | 80 HP (3 & 4 CYL) | 80 | 2-Stroke & 4-Stroke | 1978–2005 | 26-70081/8M0205729 | Includes 800 and JET models |
| Mercury | 90 HP (3 & 6 CYL) | 90 | 2-Stroke & 4-Stroke | 1978–2018 | 26-70081/8M0205729 | Includes Carb & EFI |
| Mercury | 100 HP (4 CYL) | 100 | 2-Stroke & 4-Stroke | 1978–2005 | 26-70081/8M0205729 | Includes EFI models |
| Mercury | 115 HP (4 & 6 CYL) | 115 | 2-Stroke & 4-Stroke | 1978–2018 | 26-70081/8M0205729 | Includes EFI models |
| Mercury | 120 HP | 120 | 2-Stroke | 1995–1997 | 26-70081/8M0205729 | |
| Mercury | 125 HP (4 CYL) | 125 | 2-Stroke | 1978–2005 | 26-70081/8M0205729 | |
| Mercury | V-150 Series | 150 | 2-Stroke | 1978–2005 | 26-70081/8M0205729 | Includes Magnum, Marathon, XR-2 variants |
| Force | 50-150 HP Models | 50-150 | 2-Stroke | 1978–1999 | 26-70081 |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Honda | BF75 | 75 | 4-Stroke | 1994–2018 | 91255-ZW1-003 |
| Honda | BF90 | 90 | 4-Stroke | 1994–2018 | 91255-ZW1-003 |
Technical Specs
- Product Type
- Propeller Shaft Oil Seal
- Installation
- External, gear housing
- Connection
- Press-fit
- Housing Material
- Rubber with metal case
- Housing Color
- Black
- Dimensions
- OD: 45.0 mm (1.754"), ID: 30.0 mm (1.185"), Width: 9.1 mm (0.360")
- Fitting Type
- Press-fit
- Other Technical Attributes
- Spring-loaded lip seal
What’s in the Box
- 1 x Propeller Shaft Oil Seal
Installation Notes
- Place a drain pan under the lower unit and remove the gear lube drain/fill screws to empty the oil.
- Remove the propeller nut and slide the propeller assembly off the shaft.
- Unbolt and carefully remove the bearing carrier housing that contains the oil seal.
- Pry the old seal out of the housing, taking care not to score the surrounding metal.
- Clean the seal bore in the housing thoroughly to remove any old sealant or corrosion.
- Using a socket or seal driver of the correct diameter, gently and evenly press the new seal into the housing until it is fully seated.
- Apply a light coat of marine grease to the inner lip of the new seal.
- Reinstall the bearing carrier, propeller, and any associated hardware, torquing to manufacturer specifications.
- Refill the gearcase with fresh, appropriate gear lube.
Troubleshooting & FAQ
How can I confirm this seal will fit my specific engine?
The most reliable method is to check your engine's model, serial number, and year against the detailed compatibility tables on this page. For absolute certainty, we recommend measuring your old seal's dimensions (Outer Diameter, Inner Diameter, Width) and comparing them to our listed technical specs before ordering.
What are the signs of a failing propeller shaft seal?
The most common indicators are visible gear lube leaking from around the propeller shaft area or discovering milky, water-contaminated oil when you drain your lower unit. A compromised seal can lead to catastrophic gear failure if not addressed.
A review mentioned a size issue with a 2000 Mercury XR6 150 HP. Is it compatible?
Our data shows this seal is compatible with Mercury 150 HP models from that era, including the XR6. However, manufacturing variations can occasionally occur over long production runs. We strongly advise measuring your original part before purchase to guarantee fitment. This seal's dimensions are OD: 45.0 mm (1.754"), ID: 30.0 mm (1.185"), and Width: 9.1 mm (0.360").
When should this seal be replaced?
It is best practice to replace the propeller shaft seals whenever the lower unit is serviced, such as during a water pump impeller change. You should also replace it immediately if you detect any signs of leaking or water intrusion.
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.
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