WSM 447-318 Mercury 30-300 HP Lower Unit Bearing Replacement

The WSM 447-318 is an aftermarket replacement lower unit bearing designed for Mercury outboard motors ranging from 30 to 300 HP. WSM (Water Sports Manufacturing) is a well-established manufacturer of high-quality powersports and marine replacement parts, engineered to meet or exceed original equipment manufacturer (OEM) specifications.

The lower unit bearing plays a critical role in the gearcase assembly, supporting the driveshaft and gear rotation while reducing friction and wear under the demanding load conditions found in marine environments. Replacing a worn or damaged lower unit bearing restores proper driveshaft alignment and smooth gear engagement, helping protect the entire lower unit assembly from premature failure.

Key Features:

• Aftermarket replacement lower unit bearing for Mercury outboard motors
• Engineered to meet or exceed OEM fit, form, and function
• Designed for Mercury 30–300 HP outboard applications
• Manufactured by WSM, a trusted name in marine and powersports replacement parts
• Direct-fit replacement for simplified installation

This bearing is an ideal choice for technicians and DIY mechanics performing lower unit rebuilds or gearcase service on compatible Mercury outboard motors. Always verify compatibility with your specific engine model and serial number before installation.