The Accessory Drive Tensioners
Automatic tensioners using conventional, high quality round wire torsion spring construction are inherently better able to ‘balance’ this offset load internally within the tensioner than are alternate flat wire (‘clockspring’) tensioners. This can result in generally improved tensioner alignment & durability of torsion spring tensioners in these applications. These robust torsion spring tensioner designs also do not need anti-friction PTFE filler strips as most often must be used on flatwire tensioners.
All brands of replacement automatic belt tensioners are not alike. Automatic tensioners that are specifically designed for the unique packaging & operating conditions of each engine & accessory belt layout configuration (‘application specific’) are recommended & highly preferred. When properly designed & applied, these belt tensioners will provide pre-determined (‘engineered’), constant tension & variable damping to the belt. The engineered output of these tensioners consistently maintain correct belt tension and help to dampen belt system vibrations, within the belt's replacement life.
Fastens pulley to arm. In some cases can also be used as a lift feature for belt installation.
Prevents contaminants from entering pulley ball bearing.
Maintenance free and sealed for life.
Steel or plastic construction, depending on application. Due to belt length considerations, pulley diameters are application specific.
Retains the complete tensioner assembly. Due to mechanical staking feature, tensioners are non-serviceable and cannot be disassembled safely.
Provides additional damping and alignment.
Robust and precision aluminum diecasting. Transmits torque from spring to pulley to provide constant belt tension. Arm also provides environmental protection for internal components.
Self-lubricating, highly wear resistant polymer component. Function is to ensure proper tensioner arm alignment relative to belt and counters tilting.
An engineered, highly wear resistant polymer material that provides secondary damping for smooth timing drive operation.
Critical part of tensioner. Designed to provide constant, trouble-free tension to belt for life of tensioner. Round wire design not affected by corrosion or coil-to-coil contact. Does not require a PTFE filler strip to prevent spring lock-up.
Provides primary damping for smooth tensioner and accessory drive system operation. Damping varies with spring torque for consistent level of damping throughout operating range. Engineered, highly wear resistant polymer.
Robust and precision aluminum diecasting with integral locating pin. Keeps the arm ‘true’ to belt. Provides a pivot center for arm and anchors spring. Ensures angular alignment or proper placement on engine. Other accessories or passages for engine coolant may be integrated
Incorporated into the diecasting for exact Original Equipment fit and accuracy. The purpose of the pin is to accurately locate the tensioner on the engine and does not have torque transmitted through it, after the mounting bolt is torqued down.Represents typical construction