Sierra 18-2346 Bearing Race Preload Retainer Nut for MerCruiser MR Alpha I & Gen II Sterndrive

The Sierra 18-2346 is a bearing race preload retainer nut engineered as a direct OEM replacement for MerCruiser MR Alpha and Alpha I Generation II sterndrive units. This critical drivetrain hardware is used to set and maintain proper bearing preload on the drive shaft assembly, ensuring correct gear mesh, alignment, and long-term drive unit reliability.

Key Features:

• Direct replacement for OEM bearing race preload retainer nut
• Designed specifically for MerCruiser MR Alpha and Alpha I Gen II stern drives
• Engineered to meet or exceed original equipment specifications
• Essential hardware for drive unit rebuilds, gear set replacements, and bearing service
• Backed by Sierra's industry-leading quality standards for marine aftermarket parts

OEM Cross-Reference Part Numbers:

• Mercury/MerCruiser: 824519, 8245191
• Force: 11-42633
• Mercury Marine: F694961, F694961-1

Sierra International is a trusted name in marine aftermarket parts, producing components that meet or exceed the standards of the original equipment they replace. The 18-2346 retainer nut is an essential component for any technician or boat owner performing a complete drive unit service or gear set installation on compatible MerCruiser alpha drives.