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What are the causes of a bad crankshaft pulley?

2 Answers

Kendra

07/25/25 3:52am

The reason for a bad crankshaft pulley is poor lubrication, so regular maintenance is essential. A damaged pulley has a significant impact on the vehicle, leading to poor power performance, and the engine may produce unusual sounds when idling or accelerating. Below are relevant details: 1. The car belt is mainly installed between the engine crankshaft and components such as the camshaft, water pump, generator, air conditioning compressor, and power steering pump. 2. The function of the pulley: It drives the water pump, generator, and air conditioning pump. The water pump ensures the normal water circulation of the engine for cooling, the generator charges the battery to ensure the proper operation of various circuits, and the air conditioning pump (compressor) is used for the air conditioning system. 3. Advantages of belt pulley transmission: Belt pulley transmission can mitigate load impact; it operates smoothly with low noise and vibration; the structure is simple and easy to adjust; the manufacturing and installation precision of the pulley is not as strict as that of meshing transmission; it has an overload protection function; and the center distance between the two shafts can be adjusted over a wide range.

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Herb

08/10/25 5:09pm

I've been driving for quite some years, and the main reason for a crankshaft pulley failure boils down to long-term excessive force and wear. Think about it—the engine keeps running while driving, and the pulley connects to the belt to drive various components. Frequent starts or sudden acceleration with excessive pulling can cause material fatigue and cracks. Add poor road conditions with lots of vibrations, like bumpy roads causing constant shaking, and the thing easily loosens or deforms. Temperature plays a big role too—high summer heat softens rubber, making the wheel warp faster, while winter cold makes it brittle, and if ice water splashes in, corrosion and rust accelerate. Prevention? Regularly check the belt condition—usually every 20,000 kilometers—to see if there are cracks or insufficient tension, and replace it in time to avoid trouble. Don’t skimp on this small expense; if it breaks, it might take the alternator or water pump with it, making repairs much harder.

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