The automatic belt tensioner assembly is spring loaded. Do not attempt to disassemble the tensioner assembly.The automatic belt tensioner maintains correct belt tension using a coiled spring within the tensioner housing. The spring applies pressure to the tensioner arm pressing the arm into the belt, tensioning the belt.If a new belt is being installed, the arrow must be within approximately 3 mm (1/8 in.) of indexing mark. Belt is considered new if it has been used 15 minutes or less. If this specification cannot be met, check for:The wrong belt being installed (incorrect length/width)Worn bearings on an engine accessory (A/C compressor, power steering pump, water pump, idler pulley or generator)A pulley on an engine accessory being looseMisalignment of an engine accessoryBelt incorrectly routed.