A properly sealed gearcase is the first line of defense against water intrusion and premature wear, making the Mercury Gearcase Seal Kit (8M0057716) a crucial component for maintaining your outboard’s performance. Designed specifically for Mercury/Mariner 150 EFI FourStroke outboards (serial numbers 1B905505 & up), this OEM kit includes all the necessary seals and gaskets to ensure a watertight and debris-free gearcase.

Built to withstand the rigors of a marine environment, these seals are crafted from high-quality, corrosion-resistant materials. Whether you're performing routine maintenance or addressing a small leak before it becomes a major issue, replacing all seals at once is the best way to maintain long-term reliability.

Why This Kit Matters:

• Complete Seal Replacement – Includes all essential seals and gaskets for a thorough gearcase service.
• Prevents Water Intrusion – Protects gears, bearings, and internal components from contamination.
• OEM Fit & Durability – Engineered to Mercury’s precise specifications for long-lasting performance.

A leaking gearcase can lead to serious damage if left unchecked. Keeping your seals fresh is an easy but critical step in ensuring smooth operation, maximum efficiency, and trouble-free days on the water.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.