This ball bearing supports a rotating shaft within the engine assembly, maintaining radial and axial alignment under load. It sits between the rotating component and the stationary housing, reducing friction and enabling smooth operation. A worn bearing produces audible rumble or vibration during operation, and continued use can lead to shaft misalignment or seizure. This component is manufactured to the original geometry, matching the housing bore and shaft diameter tolerances of the assembly it replaces. On installation, ensure the bearing is pressed squarely onto the shaft and into the housing without cocking.