What should I do if my Mercedes tensioner starts to crack?
What should I do if my Mercedes tensioner starts to crack? Put pressure on the tensioner 17mm head to move the tensioner up and remove the locking pin. Start the engine and ensure the belt and tensioner are working properly. Over time the tensioner pulley can start to crack. Where is the idler pulley on a Mercedes? Pull the hood release under the dashboard on the driver's side. Remove the engine cover by lifting it. Locate the idler pulley at the front of the engine. Remove the serpentine belt. Use a 17mm socket and ratchet on the tensioner nut to...