Gearcase Seal Kit – Fits Johnson/Evinrude 8, 9.9, 10, & 15 HP (Replaces 0396350, 396350, 0777568)
Gearcase Seal Kit – Fits Johnson/Evinrude 8, 9.9, 10, & 15 HP (Replaces 0396350, 396350, 0777568) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Gearcase Seal Kit – Fits Johnson/Evinrude 8, 9.9, 10, & 15 HP (...
Gearcase Seal Kit – Fits Johnson/Evinrude 8, 9.9, 10, & 15 HP (Replaces 0396350, 396350, 0777568) is backordered and will ship as soon as it is back in stock.
Product Details
This Gearcase Seal Kit – Fits Johnson/Evinrude 8, 9.9, 10, & 15 HP (Replaces 0396350, 396350) is designed to restore the integrity of your outboard's lower unit. It is engineered for a precise fit on Johnson/Evinrude 9.9 HP, 10 HP, and 15 HP 2-Stroke models (1974–2007), as well as 8 HP, 10 HP, and 15 HP 4-Stroke models (1995–2004).
This kit serves as a direct replacement for Johnson/Evinrude part numbers 0396350, 396350, and 0777568, and interchanges with Sierra 18-2656, GLM 87602, and EMP 26-00077.
- Installation Location: Mounts in the lower unit gearcase to prevent water intrusion and oil leaks.
- Included Hardware: Comes with essential drain/fill plug washers and a screw for a complete service.
- Engine Compatibility: Suitable for specified gasoline outboard engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 0396350 |
| Johnson/Evinrude | 396350 |
| Johnson/Evinrude | 0777568 |
| Sierra | 18-2656 |
| GLM | 87602 |
| EMP | 26-00077 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit fits a wide range of Johnson and Evinrude outboard motors within specific horsepower and year ranges, as detailed in the compatibility chart.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various 9.9 HP Models | 9.9 | 2-Stroke | 1974–2007 | 0396350 | Includes BE10, BJ10, E10, J10 series |
| Johnson/Evinrude | Various 15 HP Models | 15 | 2-Stroke | 1974–2007 | 0396350 | Includes BE15, BJ15, E15, J15 series |
| Johnson/Evinrude | Various 8 HP Models | 8 | 4-Stroke | 1995–2004 | 0396350 | Includes BE8, BJ8, E8, J8 series |
| Johnson/Evinrude | Various 10 HP Models | 10 | 4-Stroke | 1995–2004 | 0396350 | Includes BE10, BJ10 models |
| Johnson/Evinrude | Various 15 HP Models | 15 | 4-Stroke | 1995–2004 | 0396350 | Includes BE15, BJ15 models |
Technical Specs
- Product Type
- Gearcase Seal Kit
- Installation
- Lower Unit/Gearcase
- Fuel Type
- Compatible with gasoline engines
- Warranty
- 90 days (aftermarket versions)
- Other Technical Attributes
- Includes drain/fill plug washers and screws
What’s in the Box
- 1 x Oil Seal (0318972)
- 1 x Oil Seal (0321480)
- 1 x Oil Seal (0342247)
- 1 x Drain/Fill Plug Washer (0311598)
- 1 x O-Ring (0301877)
- 1 x O-Ring (0308627)
- 1 x O-Ring (0307853)
- 1 x O-Ring (0319085)
- 1 x Washer (0332584)
- 1 x Fill and Drain Plug Screw (0307551)
- 1 x Shift Rod Washer (0321738)
Installation Notes
- Drain the old gearcase oil completely.
- Remove the propeller, followed by the lower unit housing bolts, and detach the gearcase from the engine.
- Carefully remove the old seals, washers, and o-rings, paying close attention to their orientation and sequence.
- Thoroughly clean all component surfaces and seal cavities, removing any debris or old sealant.
- Apply a thin coat of marine grease to the new seals and o-rings before pressing them into place.
- Use a proper seal driver or a socket of matching diameter to ensure seals are installed evenly and without damage.
- Reinstall all components in the reverse order of disassembly.
- Reattach the lower unit to the engine, torquing bolts to manufacturer specifications.
- Refill the gearcase with the correct grade and quantity of new marine gear lubricant.
- After refilling, check for any leaks around the drain/fill screws and shafts before returning to service.
Troubleshooting & FAQ
How do I know if my gearcase seals are failing?
The most common signs of seal failure are milky, grey, or chunky gear lube, which indicates water contamination. You may also notice oil leaking from the propeller shaft area or dripping from the skeg after the engine has been tilted up.
Is this kit for both 2-stroke and 4-stroke engines?
Yes, this versatile kit fits a wide range of Johnson/Evinrude models, including 2-stroke engines from 1974–2007 and 4-stroke engines from 1995–2004. Always check your engine's horsepower and year against our compatibility table to ensure a correct fit.
Do I need special tools for this job?
While standard mechanic's tools are used for most of the disassembly, a seal puller tool is highly recommended for safely removing old seals, and a seal driver set (or a socket of the correct size) is essential for installing the new seals without damaging them.
How often should gearcase seals be replaced?
As a preventative measure, it is wise to replace gearcase seals every 3-5 years, or whenever the lower unit is serviced. They should be replaced immediately if you discover water in the gear oil during your annual lube change.
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.
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