Gearcase Seal Kit – Fits Johnson/Evinrude 25-28 HP Outboards (Replaces 396352)
Gearcase Seal Kit – Fits Johnson/Evinrude 25-28 HP Outboards (Replaces 396352) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Gearcase Seal Kit – Fits Johnson/Evinrude 25-28 HP Outboards (Repla...
Product Details
This Gearcase Seal Kit – Fits Johnson/Evinrude 25-28 HP Outboards (Replaces 396352) is engineered for Johnson/Evinrude 2-stroke 25-28 HP outboards manufactured in 1985 and newer. It is specifically designed for models featuring a two-piece gearcase with a cavitation plate exhaust system.
This kit provides a direct interchange for Sierra 18-2657, GLM 87601, and Mallory 9-74103, ensuring a reliable fit and function for lower unit repairs.
- Designed for two-piece gearcases with cavitation plate exhaust configuration.
- Includes a complete set of seals, O-rings, and gaskets for a comprehensive service.
- Professional installation is recommended to ensure a proper, lasting seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude (OEM) | 396352 |
| Sierra | 18-2657 |
| GLM | 87601 |
| Mallory | 9-74103 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is specifically for Johnson and Evinrude models listed. Always cross-verify your OEM part number.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 25 | 2-Stroke | 1985-Up | 396352 | Two-piece gearcase with cavitation plate exhaust |
| Johnson/Evinrude | Various | 28 | 2-Stroke | 1985-Up | 396352 | Two-piece gearcase with cavitation plate exhaust |
| Johnson/Evinrude | J25RWLEDC | 25 | 2-Stroke | 1996 | 396352 | As referenced in gearcase assembly diagrams |
Technical Specs
- Product Type
- Gearcase Seal Kit
- Dimensions
- 9.5" L x 7.0" W x 1.5" H
- Installation
- Professional recommended
- Other Technical Attributes
- For two-piece gearcase with cavitation plate exhaust configuration
- Warranty
- Varies by manufacturer
What’s in the Box
- Complete set of seals for lower unit/gearcase service
- All necessary O-rings for gearcase reassembly
- Required gaskets to ensure a proper, watertight fit
Installation Notes
- Carefully drain all lubricant from the gearcase.
- Disassemble the lower unit to access the old seals. Note the orientation of each seal before removal.
- Thoroughly clean all sealing surfaces, removing any old sealant, corrosion, or debris.
- Lightly lubricate the new seals with marine grease before installation.
- Gently press the new seals into place using a correctly sized socket or seal driver to ensure they are seated evenly.
- Reassemble the gearcase components, torquing fasteners to manufacturer specifications.
- Refill the gearcase with fresh, high-quality marine gear lubricant.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine?
This kit is for Johnson/Evinrude 25-28 HP 2-stroke outboards from 1985 and newer with a two-piece gearcase and exhaust through the cavitation plate. The surest method is to match your original part number to 396352. If you're uncertain, consult your service manual or a professional mechanic.
What are common signs of a failing gearcase seal?
The most common sign is milky, coffee-colored gear lube, which indicates water intrusion. Other symptoms include visible oil leaks around the propeller shaft or driveshaft, or a distinct burnt oil smell coming from the lower unit after operation.
Is this a complete kit for a lower unit reseal?
Yes, this kit is designed to be a comprehensive replacement for OEM kit 396352. It includes all the standard seals, O-rings, and gaskets required to properly service the gearcase.
When should I replace my gearcase seals?
Seals should be inspected during every annual service and replaced immediately if you find water in the gear lube. As a preventative measure, it's good practice to replace them whenever the gearcase is disassembled or every 3-5 years, depending on usage and operating conditions.
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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