OMC BEARING 983892 REC983892

Function and technical context

The tapered roller bearing is a critical component in marine propulsion systems, responsible for supporting and guiding the drive shaft within the engine casing. This bearing works under intense axial and radial loads, especially in stern applications with frequent changes in direction and acceleration. Its deterioration generates excessive friction, abnormal vibration in the transmission and eventual entry of water into the engine, compromising the integrity of the lubrication system and the tightness of the seals.

When to replace this part?

Typical symptoms include clunking noise from the transmission, excessive play in the tailshaft, abnormal vibration during cruising and, in advanced cases, rubbing of the shaft against the housing. It is recommended that the condition of the bearing be inspected during annual out-of-water maintenance, especially if the boat has been sailed in saltwater or sediment conditions. Preventive replacement in seasonal maintenance avoids costly emergency repairs on the water and ensures the operational safety of the propulsion system.

Compatible MerCruiser and Mercury Mariner Engines

Equivalent manufacturer part numbers