SKF Drive Belt Tensioner Pulley VKM38339

A tensioner pulley in a car is an important part of the engine's accessory belt system. Its primary function is to maintain the proper tension on the belt, ensuring that it stays in place and properly drives various engine components. The tensioner pulley is usually mounted on a spring-loaded arm and is designed to automatically adjust the tension on the belt as it stretches and wears over time.

By maintaining the proper tension on the belt, the tensioner pulley helps prevent slippage, which is essential for the smooth operation of engine accessories such as the alternator, power steering pump, and air conditioning compressor. The tensioner pulley also plays a crucial role in reducing noise and vibrations caused by the belt system. If the tensioner pulley malfunctions or is not properly adjusted, it can lead to belt squealing, decreased performance of engine accessories, or even belt failure.