Role Of The Tensioner In The Accessory Belt Drive System
Its sole job is to apply the correct amount of tension on the serpentine belt as it transfers power from the crank to the accessories in the system. The average automatic belt tensioner will adjust tension on the belt over one billion times for every 100,000 vehicle miles. Internal components in the tensioner can fail, causing stress on the belt and other accessory components, allowing the belt to slip.
A slipping belt is the worst thing that can happen to the ABDS because of the noise and heat generated by the slippage, along with pulley wear. Heat transferred by the belt, causes the grease to boil and premature failure of the bearing cage. A persistent check engine light, reduced engine cooling, inconsistent power steering performance or poor A/C system performance are all signs of belt slip due to tension loss.
Understanding these failures, and having the ability to articulate what caused them, will lead to a more satisfied customer with reduced comebacks.
Click to download the full Gates Tensioner Belt Inspection document.
