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2336070

AC BELT TENSIONER

This automatic belt tensioner assembly is designed for the air conditioning (AC) and alternator drive belt on heavy-duty diesel engines. It maintains constant, precise belt tension via an internal spring and damping mechanism, preventing slippage, squeal, and premature belt wear. Over time, the tensioner’s spring or bearing can weaken, leading to poor alternator charging, reduced AC performance, or belt failure, so it is commonly replaced when these symptoms appear or during routine accessory drive service.