for toyota alphard parts accessories

Poly rib belts, also known as serpentine belts or multi-rib belts, play a crucial role in the functionality of modern automotive engines. These belts are designed to drive multiple peripheral devices in an engine, such as the alternator, power steering pump, air conditioning compressor, and water pump. By understanding the design, function, and maintenance of poly rib belts, vehicle owners can ensure the longevity and efficiency of their engines.


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A timing belt is a looped band made from rubber, polyurethane, or silicone, and is equipped with teeth that mesh with corresponding gears. The 15mm designation refers to the width of the belt, which is a standard size that enables compatibility with many existing machines and systems. The open aspect indicates that the belt is not closed into a continuous loop but is instead available in lengths that can be cut to size or configured as needed for specific applications.


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The primary function of the internal timing belt is to synchronize the rotation of the crankshaft and camshaft. This synchronization is essential for the timing of the engine's valve openings and closings in relation to the position of the pistons. When the crankshaft rotates, the timing belt transfers that motion to the camshaft, which controls the intake and exhaust valves. Proper timing enables the engine to run smoothly, improve fuel efficiency, and increase overall performance.


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