Ignition Distributor Cap (YD146) by YEC®. If you want to restore the original performance of your vehicle’s ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or even better than the part your vehicle was manufactured with. This product is made from premium materials to serve you for years to come.
The belt tensioner is used to give tension to the belt, and is designed so that the center of rotation can move.
The idler ball bearing is used to change the direction of the belt or to adjust the width of contact to the pulley.
Both can endure high temperature and high speed rotation, and habe the structure designed to withstand vibration of the belt, taking into consideration the engine near which they are used.