Mercedes-Benz R350 serpentine belt broke after replacing pulley, battery, and alternator on Mercedes-Benz R350

Some Mercedes-Benz R350 owners report experiencing issues with serpentine belt breakage after replacing the pulley, battery, and alternator. These problems may stem from damaged or worn-out pulleys, which can compromise the integrity of the belt. Additionally, a malfunctioning tensioner is often cited as a contributing factor to belt failure. Improper alignment, frequently caused by a worn bushing in the automatic belt tensioner, can also lead to breakage. Other potential issues include failed bearings, oil or coolant leaks, a failing AC compressor, malfunctioning water pump, or faulty bushings, all of which can exacerbate the situation. It is crucial for owners to conduct a thorough inspection of all components related to the serpentine belt to identify and resolve these underlying issues, thereby preventing repeated failures.