Keep your outboard motor running smoothly with the Sierra 18-2067 oil seal, a reliable replacement for the OMC 911685. Designed for marine enthusiasts who demand durability in harsh saltwater environments, this seal prevents oil leaks and maintains optimal engine performance during long days on the water.

Superior Materials for Lasting Protection

Crafted from high-grade nitrile rubber, the Sierra 18-2067 resists heat, abrasion, and chemical exposure common in marine applications. Unlike generic seals that degrade quickly, this one features precision-machined dimensions for a perfect fit, reducing vibration and extending the life of your crankshaft or gearcase components. Boat owners report fewer breakdowns and quieter operation after installation.

Perfect Fit for OMC Engines

• Direct replacement for OMC 911685
• Compatible with Johnson and Evinrude outboards from various model years
• Suits inline and V-engine configurations where specified

Verify your engine specs to ensure seamless integration—common in 2-stroke and 4-stroke setups prone to seal wear from improper lubrication or high RPMs.

Why Boat Mechanics Trust Sierra Engine Parts

Sierra stands out in the aftermarket world for rigorous testing that mimics real-world boating conditions. The 18-2067 undergoes pressure and torque simulations, ensuring it handles the torque of powerful props without extruding or hardening prematurely. Save time and avoid OEM markups while getting a part backed by marine industry standards.

Easy Installation Steps for DIYers

Replacing your oil seal doesn't require a full teardown. Start by draining the gear oil, remove the prop and water pump housing, then use a seal puller for clean extraction. Lubricate the new Sierra 18-2067 with marine grease before pressing it in evenly with a driver tool. Torque to spec, refill, and test run—most jobs wrap up in under an hour.

Pro Tip: Always inspect the mating surface for scoring; a light polish can prevent future leaks.

Enhance Engine Longevity with Proper Care

Pair this seal with regular lower unit oil changes using high-quality gear lube. Monitor for milky oil, a sign of water intrusion, and address promptly. In salty conditions, flush after every trip to minimize corrosion around the seal lip, keeping your investment protected season after season.