Most U.S. aftermarket manufacturers use an English measurement system, where the length is expressed in tenths of an inch, but the worldwide industry standard is based on a metric measurement. This metric numbering is sometimes referred to as a “PK” number, and is found on most belts along with the manufacturer’s traditional part number.

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A serpentine belt (or drive belt[1]) is a single, continuous belt used to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, air conditioning compressor, air pump, etc.[2] The belt may also be guided by an idler pulley and/or a belt tensioner (which may be spring-loaded, hydraulic, or manual).To allow the belt to pass over more than three pulleys with a large enough wrap angle to avoid slipping, idler pulleys which press against the back of the belt are included, forcing the belt into a serpentine shape. To accommodate this bidirectional flexing while remaining strong enough to transfer the total force required by multiple loads, a serpentine belt is almost always of multi-groove (multi-vee, poly-v, or multi-rib) construction.

Belts are one of the most essential parts of a vehicle–they provide a source of power and connection for different components. Although their role in the makeup of an engine can be overlooked, many types of belts are needed to safely and effectively operate your car.Take a look at the various belts found in your engine to better understand their function and the maintenance needed!

More than you would initially imagine, drive belts play a large role in your car. In fact, no vehicle will run very long without belts in place – if it will run at all! It might seem counterintuitive to use belts in the hot engine compartment since rubber tends to be fragile, but the belts used in a car are much more than just rubber.“What are belts made of?”, you might ask. Looking back more than ten years ago, belts were typically made of neoprene rubber, reinforced by strands of cotton and layered with Kevlar. These belts were strong and lasted from 80,000 to 125,000 kilometers. Today’s drive belts are made of Ethylene Propylene Diene Monomer (EPDM) rubber that lasts up to 160,000 kilometers or more, barring unforeseen failures. EPDM rubber is stiffer than neoprene and resists stretching better.How many belts your car has depends on the make and model you drive. It may have just one long serpentine belt or it may have two or three accessory drive belts. That’s in addition to a timing belt, if your car is equipped with one.What styles of belts are on the market today? How are they used on the engine? Trodo has the descriptions of each belt for you, and you can find replacement belts for your car at Trodo.com and have them delivered to your door.

The engine of a vehicle has plenty of various components that perform different functions. However, none of these parts would work had there been no drive belt. There are differenttypes of car belts,and their job is tokeep the engine runningby transferring power to various parts. They do this by having constant friction with several pulleys. For this reason, a loose or damaged belt affects the performance of the engine component related to it.