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The tensioner pulley is the core adjustment component of the engine belt drive system. The uses are as follows: ? Maintain belt tension Automatically compensate for belt elongation (rubber naturally stretches about 2-3% due to aging) Prevent slippage: ensure friction between the belt and the pulley (typical tension value: 400-600N) ? Buffer vibration impact Absorb instantaneous speed fluctuations of the crankshaft/accessory wheel (such as air conditioning compressor start and stop) Reduce belt vibration amplitude (controlled within ±2mm) ? Extend system life Avoid overtightening (causing premature bearing wear) or overloosening (causing slippage and abnormal noise) Equilibrium sharing of multiple accessory loads (generator/water pump/air conditioner, etc.) Failure chain reaction ?? Tensioner failure ? belt slippage/breakage ? accessory system stoppage (water pump/generator/air conditioner) ? engine overheating/power failure
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