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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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 a replacement seal for lower-unit gearcase applications on listed Yamaha outboards from 30 to 300 HP and selected Mercury/Mariner outboards from 60 to 225 HP. It is designed to help prevent gear-lubricant leakage and water intrusion at the shift shaft. Because application details can vary by model, year, gearcase and serial number, confirm the original part number and service-manual application before ordering.
This aftermarket replacement is listed for Yamaha 93106-09014-00 / 931060901400 and Mercury 26-82257M. Sierra 18-0267 and Mallory 9-76423 are listed as aftermarket interchange references.
- Designed as a replacement for the lower-unit shift-shaft oil seal.
- Suitable for marine service involving exposure to gear lubricant, grease and water.
- Rubber-and-metal construction for installation in the gearcase seal bore.
- Verify dimensions and application details against the original seal before installation.
Part Number Matrix
Use the references below to compare the original part number with listed aftermarket equivalents. Number cross-references do not replace model, year, gearcase or serial-number verification.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 93106-09014-00 / 931060901400 | OEM reference |
| Mercury | 26-82257M | OEM reference |
| Sierra | 18-0267 | Aftermarket interchange reference |
| Mallory | 9-76423 | Aftermarket interchange reference |
Engine & Model Compatibility
The applications below reflect the listed compatibility range. Exact fitment may vary by model family, year, gearcase configuration and serial number. Confirm the part number, seal dimensions and service-manual specification for your engine before purchase.
For Yamaha applications, the listed range covers various 2-stroke and 4-stroke outboards from 30 HP to 300 HP manufactured from approximately 1984 onward.
For Mercury/Mariner applications, the listed range covers selected 4-stroke EFI outboards from approximately 60 HP to 225 HP, including various 60, 75, 115 and 225 HP applications. The references below are application guides, not a substitute for an exact model and serial-number check.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | Various | 30 | 2-Stroke | 1984–Present | 93106-09014-00 | Listed gear-housing application |
| Yamaha | Various | 40–300 | 2-Stroke & 4-Stroke | 1984–Present | 93106-09014-00 | Listed lower-unit shift-shaft seal application |
| Mercury/Mariner | Various | 60 | 4-Stroke EFI | 2002–Present | 26-82257M | Listed 2-cylinder applications; verify model and serial number |
| Mercury/Mariner | Various | 75–115 | 4-Stroke | 2000–Present | 26-82257M | Common listed application range; verify exact engine |
| Mercury/Mariner | Various | 225 | 4-Stroke EFI | 2004–Present | 26-82257M | Selected applications only; verify exact engine |
Technical Specs
- Product Type
- Lower-unit gearcase shift-shaft oil seal
- Installation
- Replacement installation in the gearcase seal bore
- Construction
- Rubber and metal composite
- Dimensions
- Approximately 19 mm bore × 9 mm shaft diameter; compare with the original seal before installation
- Application
- Marine lower-unit gearcase service
What’s in the Box
- 1 × Lower Unit Gearcase Shift Shaft Oil Seal
Installation Notes
Installation should be performed with the lower unit removed as required by the engine service procedure. Consult the official service manual for your exact engine before beginning work.
- Place a drain pan under the lower unit and remove the drain and vent screws to empty the gear lubricant.
- Disconnect the shift linkage and remove the bolts securing the lower unit to the midsection.
- Carefully lower and remove the gearcase from the outboard motor.
- Locate the shift-shaft seal at the specified position in the gearcase housing.
- Use a suitable seal puller or removal tool to remove the old seal without damaging the shaft or housing.
- Clean the seal bore and surrounding area, removing old sealant, corrosion and debris.
- Apply only the lubricant or sealant specified by the service manual to the seal and installation surfaces.
- Position the new seal squarely over the bore and install it with a correctly sized seal driver or socket until it reaches the specified seating depth.
- Reinstall the lower unit, reconnect the shift linkage and check shift alignment.
- Refill the gearcase with the manufacturer-specified marine gear lubricant and reinstall the drain and vent screws.
- Check for proper operation and inspect for leaks after installation.
Troubleshooting & FAQ
How do I know if this oil seal fits my specific engine model?
Compare your original seal and part number with the references listed above, then verify the exact engine model, year, gearcase configuration and serial number in the applicable service or parts manual. The broad horsepower ranges are not sufficient by themselves to confirm fitment.
What are the signs of a failing shift-shaft oil seal?
Common signs include milky or creamy gear lubricant, which can indicate water intrusion, an oil sheen around the outboard, or visible lubricant leakage near the shift shaft and lower-unit housing.
How often should this seal be replaced?
There is no universal replacement interval. Inspect the seal whenever the lower unit is removed for related service, such as water-pump maintenance, and replace it if leakage, damage or hardened sealing material is found.
Is a special tool needed for installation?
A seal puller or suitable removal tool and a correctly sized seal driver are recommended. Using the proper tools helps prevent damage to the seal, shift shaft and gearcase housing.
Why are both Yamaha and Mercury part numbers listed?
The replacement is listed for selected applications using the Yamaha 93106-09014-00 and Mercury 26-82257M references. These references do not mean every Yamaha or Mercury engine uses the same seal, so confirm the exact application before ordering.
Can this seal be used in non-marine applications?
This product is intended for marine lower-unit gearcase service. Do not use it in another application unless the dimensions, materials, operating conditions and manufacturer requirements have been independently confirmed.
Is this an OEM part?
No. This listing is for an aftermarket replacement seal, not a genuine Yamaha or Mercury component. Confirm the dimensions and application before installation.
What is the shipping speed and cost?
Typical transit is 5–15 days. Standard shipping is free, and expedited options appear at checkout where available.
What are the warranty and return terms?
The product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the standard return window when the item is unused and in its original condition. Contact support with your order details for assistance.
Safety & Important Info
- Verify the original part number, dimensions, engine model, year, gearcase and serial number before ordering.
- Do not install a seal that differs in size, orientation or construction from the service-manual specification.
- This is an aftermarket replacement, not an OEM component.
- Follow the official service manual and use appropriate safety equipment during lower-unit service.
- Professional installation is recommended when lower-unit removal or shift-linkage adjustment is required.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts designed for demanding service conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing with attention to materials and quality control.
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