Sierra 18-1118 Drive Shaft Tapered Roller Bearing for Mercury/Mariner Outboards

The Sierra 18-1118 is a precision-engineered tapered roller bearing designed specifically for Mercury and Mariner outboard motor drive shafts. This aftermarket replacement bearing is manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability in demanding marine environments.

Key Features:

• Tapered roller bearing design for superior load distribution and longevity
• Direct replacement for Mercury Marine part number 31-42677A1
• Compatible with Mercury/Mariner 100 HP 4-cylinder models with serial numbers OB209468 and up
• Also cross-references to Chrysler/Force/US Marine 31-42677A1 and GLM 22960
• Precision manufactured to OEM tolerances for proper fit and function

This bearing is a critical component in the lower unit drive shaft assembly, supporting smooth rotation and reducing friction during operation. Sierra International's marine parts are built to withstand the harsh conditions of saltwater and freshwater use, making this an ideal replacement for maintenance and repair of Mercury and Mariner outboard motors.