The official name for this part is "serpentine belt". The tensioner is mounted just to the right (looking at the motor from the front) of the water pump pulley. The belt is removed by loosening the tensioner and creating slack in the belt. The tensioner has a large 19 mm mounting nut in-line with the crankshaft. The adjustment is a barrel nut that sticks up and points to the drivers side of the car. Righty-tighty, lefty-loosey for adjustment.