Keep your outboard running smooth and leak-free with a reliable gear housing seal kit designed specifically for Johnson and Evinrude engines. Whether you're dealing with persistent oil leaks, water intrusion, or just performing routine maintenance, upgrading your lower unit seals restores factory-level performance and prevents costly damage down the line.

Understanding the Gear Housing Seal Kit

The gear housing, or lower unit, on your Johnson or Evinrude outboard takes a beating from constant exposure to water, sand, and debris. Over time, seals wear out, leading to gear lube loss and potential gear corrosion. This seal kit provides all the essential gaskets, O-rings, and seals to rebuild the assembly, ensuring a watertight barrier that protects internal components like gears, bearings, and the propeller shaft.

Perfect Fit for Popular Johnson and Evinrude Models

Engineered as a direct replacement, this kit matches the specifications of V4 and V6 2-stroke outboards across multiple horsepower ranges. It fits a wide array of models from the 1970s through early 2000s, making it a go-to choice for boaters restoring classic engines or maintaining workhorses like 88, 115, and 150 HP variants. Always cross-reference your engine's serial number to confirm compatibility, as slight variations exist between years and configurations.

What's Included in the Kit

• Propeller shaft seal and carrier
• Driveshaft seal
• Shift shaft seal
• Water pump housing seal
• Pinion gear seal
• Multiple O-rings and gaskets for gearcase halves
• High-quality, marine-grade materials resistant to fuel, oil, and saltwater

Every component is precision-machined to OEM tolerances, using durable elastomers that withstand high pressures and temperatures encountered in real-world boating conditions.

Why Boat Owners Trust This Seal Kit

Unlike generic kits that fail prematurely, this one delivers proven durability. Boaters report leak-free operation for seasons after installation, even in harsh saltwater environments. It saves time and money by bundling everything needed for a complete lower unit refresh—no hunting for missing parts. Plus, it's a smart preventive measure during gear oil changes or impeller replacements, extending the life of your investment.

Installation Made Straightforward

Tackle the job yourself with basic tools and mechanical know-how. Here's a quick overview:

1. Drain gear lube and remove the lower unit from the midsection.
2. Carefully pry out old seals using a seal puller or screwdriver, avoiding damage to housings.
3. Clean mating surfaces thoroughly with solvent to ensure a perfect seal.
4. Lubricate new seals with gear oil and tap them into place with a seal driver or socket.
5. Reassemble gearcase, torque bolts to spec, and refill with fresh gear lube.
6. Run the engine on muffs to check for leaks before trailering to the water.

Expect 4-6 hours for a first-timer. Pro tip: Inspect gears and bearings while everything's apart to catch wear early.

Signs It's Time for New Seals

Spot these red flags before they sideline your boat:

• Milky gear oil from water contamination
• Oil weeping from shaft areas or case seams
• Unusual whining from the lower unit
• Overheating during operation

Addressing these promptly avoids expensive gear replacements.

Pro Tips for Long-Lasting Seals

Maximize your kit's lifespan with these habits:

Flush the engine after every saltwater trip, use high-quality synthetic gear lube, and inspect seals annually. Avoid running in shallow water where debris can nick shafts, and never skip the water pump service—it's your first line of defense against lower unit intrusion.