what is the idler pulleys and sep belt
an idler pulley is just a pulley that you run the belt over it 's only function is to run on it own via the belt. A tensioner pulley is a pulley that makes the belt tight, with via a spring mechanism in the arm or by a bolt that loosen and lift up the tensioner and then tighten the bolt down. A tensioner is spring loaded to keep the belt tight. An idler is simply a pulley to route the belt.