Drive Shaft Oil Seal – Fits Yamaha 40-60HP Outboards (Replaces 93101-25M57-00)
Drive Shaft Oil Seal – Fits Yamaha 40-60HP Outboards (Replaces 93101-25M57-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Drive Shaft Oil Seal – Fits Yamaha 40-60HP Outboards (Replaces 9310...
Product Details
This replacement Drive Shaft Oil Seal – Fits Yamaha 40-60HP Outboards (Replaces 93101-25M57-00) is engineered to protect the lower unit gear case from water intrusion and oil leaks. It is designed for various 4-stroke Yamaha outboard models, including the F40, F50, and F60 series, ensuring a precise fit for the upper driveshaft.
This part is a direct interchange for Yamaha OEM part numbers 93101-25M57-00 and the older version, 93101-25M27.
- Installs in the lower unit / gear case assembly.
- Features a durable rubber housing with a metal casing for a secure seal.
- Engineered as an S-Type oil seal for optimal driveshaft performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 93101-25M57-00 | Current OEM Number |
| Yamaha | 93101-25M27 | Superseded by 93101-25M57-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This oil seal is designed for a range of 4-stroke outboard engines from Yamaha. Please verify your specific model is listed.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Yamaha | F40D | 40 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F40H | 40 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F50F | 50 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F50H | 50 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F60C | 60 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F60T | 60 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F60B | 60 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F60F | 60 | 4-Stroke | 93101-25M57-00 |
| Yamaha | F60A | 60 | 4-Stroke | 93101-25M57-00 |
Technical Specs
- Product Type
- Drive Shaft Oil Seal
- Installation
- Lower Unit / Gear Case
- Housing Material
- Rubber with Metal Casing
- Dimensions
- 35.5mm Outer Diameter × 23mm Inner Diameter × 10mm Height
- Weight
- 0.01 kg (0.022 lb)
What’s in the Box
- 1 x Oil Seal, S-Type (93101-25M57-00)
Installation Notes
Proper installation is critical to prevent gear case leaks. While these are general steps, always refer to your model's specific service manual.
- Drain the lower unit gear lube completely.
- Remove the lower unit from the outboard motor.
- Disassemble the water pump housing to access the old driveshaft oil seal.
- Carefully inspect the driveshaft for any scoring, rust, or wear in the seal area. Polish or repair if necessary.
- Use a seal puller to remove the old oil seal without scratching the housing.
- Clean the seal cavity thoroughly to remove any old sealant or residue.
- Lubricate the new oil seal's inner and outer edges with marine grease.
- Press the new seal into place squarely using a seal driver or a socket of the correct outer diameter. Ensure it is seated evenly and at the correct depth.
- Reassemble the water pump, install a new impeller, and reinstall the lower unit.
- Refill the gear case with the recommended marine gear lube and check for leaks.
Troubleshooting & FAQ
How do I know if my drive shaft oil seal needs replacing?
The most common sign is a milky or creamy appearance in your gear lube, which indicates water contamination. You may also notice gear oil leaking from the lower unit, especially around the propeller shaft or weep holes.
What is the difference between this S-Type seal and other types?
An S-Type oil seal features a single sealing lip and is typically used for applications with moderate pressure and rotational speed, like an outboard driveshaft. It is a standard design for providing a reliable barrier against oil leakage and water ingress.
How often should drive shaft oil seals be replaced?
It is best practice to replace the driveshaft oil seals whenever you service the water pump impeller (typically every 1-2 years or 100-200 hours). This preventative maintenance ensures lower unit integrity.
Do I need a special tool to install this seal?
While not always required, using a seal puller for removal and a seal driver (or a socket with a matching outer diameter) for installation is highly recommended. These tools help prevent damage to the new seal and the aluminum housing.
Can I reuse my old seal if it looks okay?
No. Oil seals are single-use components. The removal process almost always deforms the seal, and the rubber lip can become hardened or worn over time, compromising its ability to seal effectively. Always install a new seal.
What if I see oil leaking after installing the new seal?
An immediate leak could be caused by an incorrectly seated seal, damage to the seal during installation, or an existing groove worn into the driveshaft. Disassemble and inspect all components carefully.
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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