Gear Case Seal Kit for Suzuki DT25C, DT30C, DF25 and DF30 (Replaces 25700-95D00, 25700-95D01, 25700-95D02 and 25700-95D03)
Gear Case Seal Kit for Suzuki DT25C, DT30C, DF25 and DF30 (Replaces 25700-95D00, 25700-95D01, 25700-95D02 and 25700-95D03) 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.
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Gear Case Seal Kit for Suzuki DT25C, DT30C, DF25 and DF30 (Replaces...
Gear Case Seal Kit for Suzuki DT25C, DT30C, DF25 and DF30 (Replaces 25700-95D00, 25700-95D01, 25700-95D02 and 25700-95D03) is backordered and will ship as soon as it is back in stock.
Product Details
This gear case seal kit is intended for servicing the lower unit of selected Suzuki outboard motors, including 2-stroke DT25C and DT30C models and 4-stroke DF25 and DF30 models. It is designed for gearcase seal-service applications where the listed Suzuki reference numbers apply.
The kit is listed as a replacement for Suzuki part numbers 25700-95D00, 25700-95D01, 25700-95D02, and 25700-95D03. Aftermarket cross-references commonly associated with this application include Sierra 18-8341 and 18-7573. Confirm the number on your original part and the exact engine model before ordering.
- Seal kit for selected Suzuki lower-unit gearcase service applications.
- Includes seals, O-rings, and gaskets intended for the applicable gearcase service.
- Professional installation is recommended because correct seal orientation, seating, and torque are important to prevent water intrusion and lubricant leaks.
Part Number Matrix
Use the following references to compare the replacement application with your original part. Part-number matching should be confirmed against the engine model and serial information.
| Brand | Part Number |
|---|---|
| Suzuki | 25700-95D00 |
| Suzuki | 25700-95D01 |
| Suzuki | 25700-95D02 |
| Suzuki | 25700-95D03 |
| Sierra | 18-8341 |
| Sierra | 18-7573 |
Engine & Model Compatibility
The application below is based on the listed model and part-number references. Verify the complete model designation, year, serial range, and original part number before installation.
This listing is intended for the specified DT and DF applications. It is not intended for Suzuki DF25 V-Twin models or newer DF25A and DF30A model families unless the original part number and application are confirmed to match.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Suzuki | DT25C | 25 | 2-Stroke | 25700-95D00, 25700-95D01, 25700-95D02, 25700-95D03 | Confirm model and serial range. |
| Suzuki | DT30C | 30 | 2-Stroke | 25700-95D00, 25700-95D01, 25700-95D02, 25700-95D03 | Confirm model and serial range. |
| Suzuki | DF25 | 25 | 4-Stroke | 25700-95D00, 25700-95D01, 25700-95D02, 25700-95D03 | Not for V-Twin models; verify the original part number. |
| Suzuki | DF30 | 30 | 4-Stroke | 25700-95D00, 25700-95D01, 25700-95D02, 25700-95D03 | Verify the complete model and serial information. |
Technical Specs
- Product Type
- Lower-unit gearcase seal kit
- Application
- Selected Suzuki DT25C, DT30C, DF25, and DF30 outboard gearcases
- Stroke Applications
- 2-stroke and 4-stroke applications as listed in the compatibility table
- Installation
- Professional installation recommended
- Fuel Type
- Gasoline outboard applications
- Exclusions
- Not intended for Suzuki DF25 V-Twin or DF25A/DF30A applications unless the original part number is confirmed to match
What’s in the Box
- Gearcase seal-service kit containing the applicable seals, O-rings, and gaskets for the listed application.
Component appearance and quantity may vary by application. Compare the kit with the original parts and service requirements before disassembly.
Installation Notes
- Drain the gearcase oil into a suitable container.
- Remove the propeller assembly and then remove the lower unit from the outboard’s midsection according to the manufacturer’s service procedure.
- Disassemble the gearcase carefully to access the driveshaft, propeller-shaft, and shift-shaft sealing areas. Record the orientation and order of components.
- Remove the old seals, O-rings, and gaskets with appropriate tools. Avoid scratching machined sealing surfaces.
- Clean the components and inspect the shafts, bearing surfaces, housings, and sealing bores for wear or damage.
- Lightly lubricate applicable seals with a suitable marine lubricant and install them using the correct driver or installation tool. Follow the service manual for seal orientation.
- Reassemble the gearcase, ensuring that bearings, shafts, shims, and related components are correctly seated. Torque fasteners to the manufacturer’s specifications.
- Reinstall the lower unit, fill it with the specified gearcase lubricant, and check for leaks before returning the engine to service.
Troubleshooting & FAQ
How do I confirm this kit fits my Suzuki engine?
Compare your complete engine model, stroke type, year or serial information, and the number on your original gearcase seal kit with the compatibility table. This listing is intended for selected DT25C, DT30C, DF25, and DF30 applications. Do not rely on horsepower alone, and do not use it for DF25 V-Twin or newer DF25A/DF30A models unless the original part number is confirmed.
What are common signs of a failing gearcase seal?
Possible signs include milky or watery gear lubricant, visible lubricant around the propeller shaft or driveshaft housing, or a recurring need to top off the gearcase lubricant. These symptoms require inspection to identify the actual source of the leak.
When should gearcase seals be inspected?
Inspect the gearcase during routine maintenance and whenever lubricant appears contaminated or a leak is observed. Follow the maintenance schedule and inspection intervals in the engine manufacturer’s service documentation.
Can I install this kit myself?
Installation may be possible for an experienced marine mechanic with the correct tools and service information. Because incorrect seal installation can cause water intrusion, lubricant loss, and gearcase damage, professional installation is recommended.
Is this an OEM component?
No. This listing is for an aftermarket replacement seal kit. Confirm the application and reference numbers before ordering.
What should I do if the part number or model does not match?
Do not install the kit based only on a similar-looking part or horsepower rating. Contact the seller with the complete engine model, serial information, and original part number so the application can be checked.
Safety & Important Information
- Verify the complete engine model, year or serial range, stroke type, and original part number before purchase.
- Do not use this kit for a DF25 V-Twin or newer DF25A/DF30A application unless the original part number is confirmed to match.
- Use the manufacturer’s service manual for disassembly procedures, seal orientation, clearances, and torque specifications.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended.
About Sea Sierra
- Marine Parts Focus — Replacement components for common marine service and repair applications.
- Application-Focused Listings — Product references and compatibility information are provided to help customers compare the original part and engine model.
- Support for Part Verification — When fitment is uncertain, provide the complete engine model and original part information before ordering.
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