Lower Unit Gearcase Shift Shaft Oil Seal – Fits Yamaha 30-300 HP & Mercury 60-225 HP (Replaces 93106-09014-00, 26-82257M)
Lower Unit Gearcase Shift Shaft Oil Seal – Fits Yamaha 30-300 HP & Mercury 60-225 HP (Replaces 93106-09014-00, 26-82257M) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Lower Unit Gearcase Shift Shaft Oil Seal – Fits Yamaha 30-300 HP & Mercury 60-225 HP (Replaces 93106-09014-00, 26-82257M) is backordered and will ship as soon as it is back in stock.
Product Details
This marine-grade Lower Unit Gearcase Shift Shaft Oil Seal is designed for lower unit gearcase applications on Yamaha outboards from 30 to 300 HP (1984–present) and select Mercury/Mariner models from 60 to 225 HP, primarily 4-stroke engines. It provides a reliable seal to prevent gear lube leakage and water intrusion.
This part is a direct replacement for Yamaha 93106-09014-00 / 931060901400, Mercury 26-82257M, Sierra 18-0267, and Mallory 9-76423.
- Engineered for direct OEM replacement fit and function.
- Resistant to saltwater, oil, and grease for extended service life.
- Constructed from a durable rubber and metal composite.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 93106-09014-00 / 931060901400 | OEM Reference |
| Mercury | 26-82257M | OEM Reference |
| Sierra | 18-0267 | Aftermarket Interchange |
| Mallory | 9-76423 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha applications, this seal is widely used on the lower unit shift shaft for most 2-stroke and 4-stroke models from 30 HP to 300 HP manufactured since 1984.
For Mercury applications, this seal fits various 4-stroke EFI models, including many 60, 75, 115, and 225 HP outboards manufactured from 2000 to the present.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | Various | 30 | 2-Stroke | 1984–Present | 93106-09014-00 | Gear housing application |
| Yamaha | Various | 40-300 | 2-Stroke & 4-Stroke | 1984–Present | 93106-09014-00 | Lower unit shift shaft seal |
| Mercury | Various | 60 | 4-Stroke EFI | 2002–Present | 26-82257M | 2-cylinder models |
| Mercury | Various | 225 | 4-Stroke EFI | 2004–Present | 26-82257M | Specific models |
| Mercury | Various | 75-115 | 4-Stroke | 2000–Present | 26-82257M | Common application |
Technical Specs
- Product Type
- Gear Housing Oil Seal
- Installation
- Direct OEM replacement
- Housing Material
- Rubber/Metal composite
- Dimensions
- 19mm bore × 9mm shaft diameter
- Other Technical Attributes
- Designed for marine applications with saltwater resistance
What’s in the Box
- 1 x Lower Unit Shift Shaft Oil Seal (Replaces 93106-09014-00/26-82257M)
Installation Notes
Generic installation process follows. For detailed instructions, consult your engine’s official service manual.
- Place a drain pan under the lower unit and remove the drain and vent screws to empty the gear lube.
- Disconnect the shift linkage and remove the bolts securing the lower unit (gearcase) to the midsection.
- Carefully lower and remove the gearcase from the outboard motor.
- Locate the shift shaft seal at the top of the gearcase housing.
- Use a seal puller or a flat-head screwdriver to carefully pry out the old seal, avoiding damage to the housing.
- Thoroughly clean the seal bore area to remove any old sealant, corrosion, or debris.
- Lightly grease the outer edge of the new seal and the inner lip that contacts the shift shaft.
- Place the new seal squarely over the bore and use a socket or seal driver of the correct diameter to gently tap it into place until it is fully seated.
- Reinstall the lower unit, reconnecting the shift linkage and ensuring proper alignment.
- Refill the gearcase with the manufacturer-specified marine gear lubricant. Reinstall and tighten vent and drain screws.
Troubleshooting & FAQ
How do I know if this oil seal fits my specific engine model?
The best way to confirm is by cross-referencing your original part number with the numbers listed in our Part Number Matrix (Yamaha 93106-09014-00, Mercury 26-82257M). While our compatibility table is extensive, always double-check against your service manual or the part itself.
What are the signs of a failing shift shaft oil seal?
Common signs include milky or creamy-looking gear lube (indicating water intrusion) or an oil sheen on the water around your outboard. You may also notice a visible gear lube leak down the exterior of the lower unit housing near the shift shaft.
How often should this seal be replaced?
There is no fixed replacement interval. It is best practice to replace the shift shaft seal whenever the lower unit is removed for other service, such as a water pump impeller change, or immediately if you detect signs of a leak.
Is any special tool needed for installation?
While not always required, using a seal puller for removal and a proper seal driver (or a socket with the same outer diameter as the seal) for installation is highly recommended. This helps prevent damage to the seal and the gearcase housing.
Why is there both a Yamaha and Mercury part number?
Many outboard components are shared between manufacturers. This particular seal is used by both Yamaha and Mercury in different engine applications, making it a cross-compatible part. Our aftermarket version is designed to meet the specifications for both OEM part numbers.
Can this seal be used in non-marine applications?
This seal is specifically designed with a rubber/metal composite that is resistant to saltwater, oils, and the temperature fluctuations common in marine environments. We do not recommend using it for applications outside of its intended purpose.
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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