Lower Unit Seal Kit – Fits Suzuki DF25/DF30 4-Stroke (Replaces 25700-95D00, 25700-95D01, 25700-95D02, 25700-95D03)
Lower Unit Seal Kit – Fits Suzuki DF25/DF30 4-Stroke (Replaces 25700-95D00, 25700-95D01, 25700-95D02, 25700-95D03) 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
Lower Unit Seal Kit – Fits Suzuki DF25/DF30 4-Stroke (Replaces 2570...
Product Details
This aftermarket Lower Unit Seal Kit provides all necessary components to service the gearcase on select Suzuki and Johnson/Evinrude 4-stroke outboards, as well as older Suzuki 2-stroke models. It is designed for DF25 & DF30 4-strokes (2000–2006, excluding V-Twin), Johnson/Evinrude 25HP & 30HP 4-strokes (2000–2007), and Suzuki DT25C/DT30C 2-strokes (1988–2000).
It directly replaces Suzuki OEM part numbers 25700-95D00, 25700-95D01, 25700-95D02, and 25700-95D03, along with Sierra 18-8341 and Johnson/Evinrude 5032167.
- Complete kit for a full lower unit/gearcase service.
- Installation requires mechanical disassembly of the lower unit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Suzuki | 25700-95D03 | Replaces 25700-95D00, 25700-95D01, 25700-95D02 |
| Johnson/Evinrude | 5032167 | Direct interchange |
| Sierra | 18-8341 | Direct interchange |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Suzuki outboards, this kit fits specific DF 4-stroke and DT 2-stroke models. Note the V-Twin exception for the DF25.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF25 | 25 | 4-Stroke | 2000–2006 | 25700-95D03 | Except V-Twin models |
| Suzuki | DF30 | 30 | 4-Stroke | 2000–2006 | 25700-95D03 | All models |
| Suzuki | DT25C | 25 | 2-Stroke | 1989–2000 | 25700-95D03 | All models |
| Suzuki | DT30C | 30 | 2-Stroke | 1988–1995 | 25700-95D03 | All models |
For Johnson/Evinrude, this kit is compatible with specific 4-stroke models from the early to mid-2000s.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | E25 | 25 | 4-Stroke | 2000–2001, 2005–2006 | 5032167 | All models |
| Johnson/Evinrude | E30 | 30 | 4-Stroke | 2000–2001, 2005–2007 | 5032167 | All models |
Technical Specs
- Product Type
- Lower Unit Gearcase Seal Kit
- Weight
- 0.4 kg (0.88 lb)
- Package Dimensions
- 15.0" × 12.0" × 2.0" (381 × 305 × 51 mm)
- Contents
- Complete seal kit for lower unit/gearcase service
What’s in the Box
- A complete set of all seals, gaskets, and O-rings necessary for a lower unit gearcase service.
Installation Notes
- Drain the gearcase oil completely.
- Carefully disassemble the lower unit to access the old seals. Keep track of all components.
- Remove old seals and O-rings, ensuring all mating surfaces are clean and free of debris or corrosion.
- Lubricate new seals with marine grease before installation to ensure a proper fit and prevent damage.
- Install the new seals using appropriate drivers to ensure they are seated correctly and not damaged.
- Reassemble the lower unit, torquing all bolts to manufacturer specifications.
- Refill with fresh gearcase oil and check for leaks before operation.
Troubleshooting & FAQ
Which Suzuki models does this kit fit?
This kit is compatible with Suzuki 4-stroke DF25 & DF30 models from 2000–2006 (excluding V-Twin DF25s) and 2-stroke DT25C (1989–2000) & DT30C (1988–1995) models.
Will this kit work for a Johnson/Evinrude V4 or V6 engine?
No, this kit is specifically designed for smaller horsepower 4-stroke Johnson/Evinrude 25HP (2000–2001, 2005–2006) and 30HP (2000–2001, 2005–2007) models. It is not compatible with V4 or V6 outboards.
What are the signs that my gearcase seals are failing?
Common symptoms include milky or creamy-looking gear oil (indicating water intrusion), visible oil leaks around the propeller shaft or driveshaft, or metal shavings in the oil. A failed pressure/vacuum test during service also confirms a leak.
Is this a complete kit for the lower unit?
Yes, this is a comprehensive kit containing all the necessary seals, O-rings, and gaskets required to fully service the lower unit gearcase. It is assembled to match OEM kit contents.
How often should lower unit seals be replaced?
There is no fixed replacement interval, but seals should be inspected during every annual service or whenever the gear oil is changed. It's recommended to replace them if you notice any signs of water intrusion or leakage, or as a preventative measure on older engines (e.g., every 5-7 years).
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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