Lower Unit Seal Kit – Fits Suzuki DF60/DF70 4-Stroke Outboards (Replaces 25700-99E00)
Lower Unit Seal Kit – Fits Suzuki DF60/DF70 4-Stroke Outboards (Replaces 25700-99E00) is backordered and will ship as soon as it is back in stock.
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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.).
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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 DF60/DF70 4-Stroke Outboards (Rep...
Product Details
This is a complete Lower Unit Seal Kit – Fits Suzuki DF60/DF70 4-Stroke Outboards, designed to restore the gearcase integrity of Suzuki 4-Stroke 60–70 HP (DF60/DF70) models from 1998–2010. It provides all necessary seals and gaskets to stop and prevent leaks, protecting your gears from water intrusion.
It serves as a direct replacement for Suzuki 25700-99E00, Sierra 18-8381, WSM 18-8381, and Johnson/Evinrude 5034776, offering a reliable fit and performance equivalent to the original parts.
- Contains high-performance OEM style gaskets and seals that meet or exceed original specifications.
- Designed for a complete lower unit overhaul to ensure a comprehensive seal.
- Professional installation is recommended to ensure proper seating and a leak-free seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Suzuki | 25700-99E00 |
| Sierra | 18-8381 |
| WSM | 18-8381 |
| Johnson/Evinrude | 5034776 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is confirmed to fit a range of Suzuki-built outboards, including those branded as Johnson/Evinrude during specific years.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF60 (4-cylinder) | 60 | 4-Stroke | 1998–2009 | 25700-99E00 | |
| Suzuki | DF70 (4-cylinder) | 70 | 4-Stroke | 1998–2009 | 25700-99E00 | |
| Suzuki | DF60T | 60 | 4-Stroke | 2001–2009 | 25700-99E00 | |
| Suzuki | DF70T | 70 | 4-Stroke | 2001–2008 | 25700-99E00 | |
| Suzuki | DF60 (3-cylinder) | 60 | 4-Stroke | 2010–2018 | 25700-99E00 | Later 3-cylinder engine |
| Suzuki | DF50 (3-cylinder) | 50 | 4-Stroke | 2014–2018 | 25700-99E00 | Later engine design |
| Johnson/Evinrude | E-TEC | 60-70 | 4-Stroke | 2005–2006 | 5034776 | Suzuki-built BRP engines |
Technical Specs
- Product Type
- Lower Unit (Gearcase) Seal Kit
- Other Technical Attributes
- High-performance OEM style gaskets and seals that meet or exceed OEM standards
- Packaged Dimensions
- 7.5 × 6.0 × 1.0 in (190.5 × 152.4 × 25.4 mm)
- Weight
- 0.15 lbs (0.068 kg)
What’s in the Box
- A complete set of high-performance seals, gaskets, and O-rings required for a Suzuki 60-70HP outboard lower unit service.
Installation Notes
- Safely secure the outboard and drain the gearcase oil into a suitable container.
- Carefully unbolt and detach the lower unit from the engine's midsection.
- Disassemble the gearcase components, including the propeller shaft housing and driveshaft bearing carrier, to access all seals.
- Systematically remove all old gaskets, seals, and O-rings, taking care not to scratch any sealing surfaces.
- Thoroughly clean all mating surfaces and seal bores to remove old adhesive, corrosion, and debris.
- Apply a thin coat of marine grease to the new seals and O-rings before installation.
- Carefully press the new seals into place using appropriate drivers to ensure they are seated evenly and without damage.
- Reassemble the gearcase, torquing bolts to manufacturer specifications.
- Reinstall the lower unit, and refill with fresh gear lubricant to the proper level before operation.
Troubleshooting & FAQ
How do I know if this seal kit fits my Suzuki outboard?
This kit is for Suzuki DF60 and DF70 4-stroke models from 1998–2018. It covers both the earlier 4-cylinder and later 3-cylinder designs. Please cross-reference your engine model and year with the compatibility table above.
What are the signs that my lower unit seals are failing?
The most common signs include a milky or creamy appearance in your gear lube (indicating water contamination), visible oil leaking from the propeller shaft or driveshaft area, or a recurring loss of gear oil.
Is this kit for the Suzuki-built Johnson/Evinrude models?
Yes, this kit is compatible with the 60-70 HP 4-stroke Johnson/Evinrude engines manufactured by Suzuki for BRP between 2005 and 2006, which use OEM part number 5034776.
Should I replace all the seals at once or just the one that is leaking?
For a reliable, long-lasting repair, it is highly recommended to replace all seals and gaskets in the lower unit at the same time. This prevents a different old seal from failing shortly after the repair.
How often should lower unit seals be replaced?
There is no fixed interval, but seals should be inspected during every gear lube change. It is good practice to consider a full replacement every 500 hours or 5 years, or immediately if you notice any signs of water intrusion or leaks.
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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