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Description
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 This gear case seal kit is designed for Suzuki 2 Stroke DT25C DT30C and 4 Stroke DF25 DF30 (non V twin) outboard motors, covering models from the 1990s through the 2000s. It provides the necessary components to service and reseal the lower unit gearcase. This kit is a direct replacement for Suzuki OEM part numbers 25700 95D00, 25700 95D01, 25700 95D02, and 25700 95D03, as well as Sierra part numbers
Gear Case Seal Kit – Fits Suzuki DT25/DT30/DF25/DF30
This gear case seal kit is designed for Suzuki 2-Stroke DT25C/DT30C and 4-Stroke DF25/DF30 (non-V-twin) outboard motors, covering models from the 1990s through the 2000s. It provides the necessary components to service and reseal the lower unit gearcase.
This kit is a direct replacement for Suzuki OEM part numbers 25700-95D00, 25700-95D01, 25700-95D02, and 25700-95D03, as well as Sierra part numbers 18-8341 and 18-7573.
- Includes all seals, O-rings, and gaskets required for a complete gearcase housing service.
- Compatible with standard marine gasoline engines.
- Important: Not intended for use with Suzuki DF25 V-Twin or DF25A/30A series engines.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Suzuki | 25700-95D00 |
| Suzuki | 25700-95D01 |
| Suzuki | 25700-95D02 |
| Suzuki | 25700-95D03 |
| Sierra | 18-8341 |
| Sierra | 18-7573 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Suzuki owners, you can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.
| 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 Specifications
| Specification | Value |
|---|---|
| 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 |
Package Contents
- Includes all necessary seals, O-rings, and gaskets required for a complete gearcase service.
Installation Guide
Professional installation is highly recommended. The following are general steps and may not be exact for your model.
- Drain the gearcase oil completely by removing the drain and vent plugs.
- Remove the propeller assembly.
- Unbolt and carefully separate the lower unit (gearcase) from the engine's upper casing.
- Disassemble the gearcase to access the propeller shaft, driveshaft, and shift shaft seals.
- Carefully remove all old seals and O-rings, taking note of their orientation.
- Clean all sealing surfaces thoroughly to remove any old sealant or corrosion.
- Install the new seals and O-rings from the kit, ensuring they are properly seated.
- Reassemble the gearcase components according to manufacturer specifications.
- Reinstall the lower unit onto the engine, ensuring proper driveshaft and shift rod alignment.
- Refill the gearcase with the correct type and amount of fresh marine gear oil.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my Suzuki engine?
A: Please check your engine model against the "Compatible Engine Models" table. It is crucial to note that this kit does not fit DF25 V-Twin or the newer DF25A/DF30A models. Verify your OEM part number if possible.
Q: What are the common signs that my gear case seals need replacing?
A: The most common signs of a failing gear case seal are discovering a milky, white substance in your gear oil (indicating water intrusion) or seeing gear oil leaking from the propeller shaft or lower unit housing.
Q: How difficult is this kit to install?
A: We strongly recommend professional installation. Replacing gearcase seals requires disassembly of the lower unit, specialized tools like a seal puller and press, and a good understanding of outboard mechanics to ensure everything is reassembled and aligned correctly.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy