In a car engine, a pulley is a mechanical component that is used to drive the engine’s accessories, such as the alternator, water pump, power steering pump, and air conditioning compressor. The pulley is typically mounted on the engine’s crankshaft and is driven by a belt, which is also called a serpentine belt or accessory belt.

The pulley in a car engine is usually designed as a V-belt pulley, which means that it has a V-shaped groove around its circumference that matches the V-shaped profile of the belt. As the engine runs, the pulley rotates and the belt rides in the groove, transmitting power from the crankshaft to the various engine accessories.

In addition to V-belt pulleys, some car engines may also use other types of pulleys, such as tensioner pulleys and idler pulleys. Tensioner pulleys are designed to maintain proper tension on the belt, while idler pulleys are used to change the direction of the belt’s travel or to provide additional support for the belt.

Pulleys in a car engine are an essential component that helps to drive the various accessories that are required for proper operation of the vehicle. They are typically made from durable materials such as steel, aluminum, or plastic, and are designed to withstand the high temperatures and stresses that are present in an operating engine.

pulley of automobile engine2

How to buy pulley and belt?

There are a variety of places where you can buy pulleys and belts, depending on your needs and preferences. Here are some options:

  • Automotive parts stores: If you need pulleys and belts for a car engine, many auto parts stores carry a wide selection of these components. Examples of auto parts stores include AutoZone, O’Reilly Auto Parts, Advance Auto Parts, and NAPA Auto Parts.
  • Manufacturer or distributor websites: Some manufacturers and distributors of pulleys and belts may sell their products directly to customers through their own websites. For example, Gates Corporation is a leading manufacturer of belts and pulleys and has an online store where you can purchase their products.
  • Local machine shops or repair shops: If you need a specific type of pulley or belt that is not commonly available, you may want to check with local machine shops or repair shops that specialize in your type of equipment. They may be able to source or fabricate the components you need.
  • Industrial suppliers: If you need pulleys and belts for industrial machinery, you may want to check with industrial suppliers such as Grainger, MSC Industrial Supply, and Motion Industries.
  • Online retailers: There are many online retailers that specialize in pulleys and belts, including Amazon, eBay, and other specialized retailers such as V-Belt Guys and These online retailers may offer a wider selection and more competitive pricing than brick-and-mortar stores.

When purchasing pulleys and belts, it’s important to ensure that you get the right size and type of component for your specific application. Be sure to consult the manufacturer’s specifications and seek the advice of a qualified mechanic or industrial specialist if you are unsure.


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