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 (Replaces 26-82257M, 93106-09014-00) 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.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Shift Shaft Lower Unit Gearcase Oil Seal – Fits Mercury Marine 60-225 HP & Yamaha 30-300 HP (Replaces 26-82257M, 93106-09014-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Shift Shaft Lower Unit Gearcase Oil Seal is an essential aftermarket component designed to fit a wide variety of Mercury Marine (60-225 HP) and Yamaha (30-300 HP) outboard motors. It creates a crucial barrier in the lower unit gearcase, effectively preventing lubricant leaks and protecting internal components from water intrusion.
This part serves as a direct replacement for Mercury Marine part 26-82257M, Yamaha 93106-09014-00, Sierra 18-0267, and Mallory 9-76423.
- Engineered for direct OEM-level replacement, ensuring proper fit and function.
- Constructed from durable rubber and metal composite materials for reliable performance in harsh marine and saltwater environments.
- The package includes one high-quality oil seal for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Marine | 26-82257M |
| Yamaha | 93106-09014-00 |
| Sierra | 18-0267 |
| Mallory | 9-76423 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This seal is compatible with a wide range of Mercury Marine outboards from 60 to 225 HP. Verify your OEM part number before ordering.
This seal is compatible with various Yamaha 2-stroke and 4-stroke outboards from 30 to 300 HP. Verify your OEM part number for an exact match.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury Marine | Various | 60-225 | 2-Stroke & 4-Stroke | 26-82257M | Shift shaft application |
| Yamaha | Various | 30-300 | 2-Stroke & 4-Stroke | 93106-09014-00 | Gear housing application |
Technical Specs
- Product Type
- Gear Housing Oil Seal
- Installation
- Direct OEM replacement
- Dimensions
- 19mm bore × 9mm shaft × 5.25mm width
- Housing Material
- Rubber/Metal composite
- Other Technical Attributes
- Designed for marine applications with resistance to salt water exposure
What’s in the Box
- 1 x Oil Seal (Replaces 26-82257M, 93106-09014-00)
Installation Notes
- Disconnect the battery and drain the lower unit gearcase oil into an approved container.
- Disassemble the lower unit as required to gain access to the old shift shaft seal.
- Carefully remove the worn seal using a seal puller or flat-head screwdriver, being cautious not to scratch or gouge the housing.
- Thoroughly clean the seal bore in the gearcase and the surface of the shift shaft, removing any old sealant, dirt, or corrosion.
- Lightly lubricate the inner and outer surfaces of the new seal with marine grease.
- Gently press the new seal into place, ensuring it is square to the housing. Use a correctly sized seal driver or socket to apply even pressure.
- Reassemble all lower unit components according to the manufacturer’s service manual specifications.
- Refill the gearcase with the recommended type and amount of marine gear lubricant.
- Inspect for any leaks around the new seal before and after starting the engine.
Troubleshooting & FAQ
How do I know if this seal will fit my specific engine model?
This seal fits a wide range of Mercury Marine (60-225 HP) and Yamaha (30-300 HP) outboards. The best way to confirm fitment is by matching your old part number to the references listed in our Part Number Matrix: 26-82257M (Mercury) or 93106-09014-00 (Yamaha).
What are the signs of a failing gearcase oil seal?
Common signs include visible oil leaks around the lower unit, milky or gray-colored gearcase oil (indicating water intrusion), or a persistent burning oil smell. Inspecting the oil during routine changes is the best way to catch a problem early.
Can I install this seal myself?
While DIY installation is possible for those with mechanical experience, we recommend professional installation. Special tools may be required for removal and for pressing in the new seal without damaging it or the housing, which is critical for a leak-free fit.
How often should this seal be replaced?
There is no fixed replacement interval. It should be inspected for signs of leaking, cracking, or hardening during regular lower unit service (e.g., water pump impeller changes) and replaced as a preventative measure or at the first sign of failure.
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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