power transmission belts

In the world of automotive engineering, few components are as crucial yet often overlooked as timing belts and chains. These components are fundamental to the proper functioning of an internal combustion engine, ensuring that the engine's valves open and close at the correct times in relation to the position of the pistons. To comprehend their importance, it's essential to explore their functions, variations, maintenance, and the implications of failure.


...

The term 4PK refers to a specific type of fan belt characterized by having four ribs on its inner surface. The PK designation indicates the design style, which is often found in multi-rib belts used for engaging multiple accessory components powered by the engine, such as the alternator, power steering pump, water pump, and air conditioning compressor. The ribs help to ensure a firm grip on the pulleys, enabling efficient power transfer and minimized slippage.


...