Gear Case Seal Kit – Fits Suzuki DT25/DT30/DF25/DF30 (Replaces 25700-95D03, 25700-95D00)
Gear Case Seal Kit – Fits Suzuki DT25/DT30/DF25/DF30 (Replaces 25700-95D03, 25700-95D00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gear Case Seal Kit – Fits Suzuki DT25/DT30/DF25/DF30 (Replaces 2570...
Product Details
This Gear Case Seal Kit – Fits Suzuki DT25/DT30/DF25/DF30 (Replaces 25700-95D03, 25700-95D00) provides all necessary seals and gaskets for servicing the lower unit on Suzuki 2-Stroke DT25C/DT30C and 4-Stroke DF25/DF30 (non-V-twin) outboard motors manufactured in the 1990s–2000s.
It is a direct replacement for Suzuki part numbers 25700-95D00, 25700-95D01, 25700-95D02, and 25700-95D03, as well as Sierra interchanges 18-8341 and 18-7573.
- Includes a complete set of seals, o-rings, and gaskets for a full gearcase service.
- For safety and optimal performance, professional installation is recommended.
- Backed by a 1-year warranty from East-Boat-Parts.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Suzuki | 25700-95D00 |
| Suzuki | 25700-95D01 |
| Suzuki | 25700-95D02 |
| Suzuki | 25700-95D03 |
| Sierra | 18-8341 |
| Sierra | 18-7573 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for specific Suzuki outboards. It is not compatible with DF25 V-Twin or newer DF25A/30A engines.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Suzuki | DT25C | 25 | 2-Stroke | 25700-95D00/95D01/95D02/95D03 | |
| Suzuki | DT30C | 30 | 2-Stroke | 25700-95D00/95D01/95D02/95D03 | |
| Suzuki | DF25 | 25 | 4-Stroke | 25700-95D00/95D01/95D02/95D03 | Not for V-twin models |
| Suzuki | DF30 | 30 | 4-Stroke | 25700-95D00/95D01/95D02/95D03 | Not for V-twin models |
Technical Specs
- Product Type
- Lower Unit Gear Case Seal Kit
- Installation
- Professional recommended
- Fuel Type
- Gasoline
- Warranty
- 1 Year (East-Boat-Parts)
- Other Technical Attributes
- Not intended for Suzuki DF25 V-Twin or DF25A/30A engines
What’s in the Box
- Complete set of seals, O-rings, and gaskets required for a lower unit gearcase service.
Installation Notes
- Drain the gearcase oil into a suitable container.
- Remove the propeller assembly, followed by the lower unit (gearcase) from the outboard's midsection.
- Carefully disassemble the gearcase to access the driveshaft, prop shaft, and shift shaft seals. Note the orientation and order of all components.
- Using appropriate tools, remove all old seals, o-rings, and gaskets. Be cautious not to scratch or damage any sealing surfaces.
- Thoroughly clean all components and inspect for wear or damage.
- Lightly lubricate the new seals with marine grease and press them into place using a correctly sized driver or socket.
- Reassemble the gearcase components, ensuring all bearings, shafts, and shims are correctly seated. Torque bolts to manufacturer specifications.
- Reinstall the lower unit, refill with fresh gearcase oil to the correct level, and check for any leaks before operation.
Troubleshooting & FAQ
How do I confirm this kit fits my specific Suzuki engine?
Check the compatibility table on this page. This kit fits 2-stroke DT25C/DT30C and 4-stroke DF25/DF30 (non-V-twin) models. It explicitly does not fit DF25 V-Twin or the newer DF25A/30A engines. Always verify your engine model and year before ordering.
What are the signs of a failing gearcase seal?
Common symptoms include milky or watery gear lube (indicating water intrusion), visible oil leaks around the propeller shaft or driveshaft housing, or a persistent need to top off the gear oil. Any of these signs suggest it's time to inspect and replace the seals.
How often should gearcase seals be replaced?
It's good practice to inspect gearcase seals annually or every 100 hours of operation, whichever comes first. They should be replaced as a preventative measure every 300-500 hours or immediately if any signs of leaking or water intrusion are found.
Can I install this kit myself?
While DIY installation is possible for experienced mechanics with the proper tools (like a seal puller and press), we recommend professional installation. Improper installation can lead to seal failure, water intrusion, and costly gearcase damage.
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.
Payment & Security
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