Virtually every automotive engine uses rubber belts to power various accessories outside the engine block and critical engine parts inside. The belt that is external to the block is usually called the accessory belt or fan belt. They used to be a single V-shaped belt but today they are serpentine belts that slither around several pulleys. These pulleys typically drive the alternator, AC compressor, power steering pump and water pump. Sometimes this serpentine belt is mounted in the front of the engine but in transverse engines, it’s usually on the side. Serpentine belts need to be replaced when they show wear, such as cracks, fraying or stretching.


