Function

• Provides constant tension to the belt to eliminate slip or noise
• Dampens belt vibrations caused by engine firing
• Tunes the accessory drive system for proper function
• Maintains alignment of the belt
• Automatically adjusts for belt stretch and wear

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.

Features

All brands of replacement automatic belt tension-ers 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 pro-vide pre-determined (‘engineered’), constant ten-sion & variable damping to the belt. The engi-neered output of these tensioners consistently maintain correct belt tension and help to dampen belt system vibrations, within the belt's replace-ment life.

The primary advantages of a well-designed automatic belt tensioner are:

• Maintains its correct alignment to the belt
• Automatically maintains correct accessory belt tension
• Automatically dampens normal accessory system vibrations
• Eliminates need to adjust / re-tension belts
• Prevents belt slip (noise / excessive belt wear)
• Optimizes life of belt
• Provides for indication of correct belt length
• Provides indication of excessive belt stretch (replacement)
• Improves belt system alignment
• Extends accessory system component life

Litens accessory drive tensioners provide:

• Equal or greater than Original Equipment quality and performance
• Custom, application-specific fit, form and function
• Quieter and smoother accessory drive operation
• Extended accessory drive component durability
• Constant ‘engineered’ belt tension
• Improved belt life

• The latest generation of Mercedes Crankshaft Isolator Pulley for Diesel applications
• Permits lowest operating belt tension
• Increases system durability
• Improves fuel economy
• Reduces emissions

Over 160 million vehicles worldwide are now equipped with the patented Litens Overrunning Alternator De-coupler (OAD). By 2022 the vehicle population using a Litens OAD will increase up to almost 220 million.

The fluctuating rotational speeds of the crankshaft cause tension peaks. These are transferred to the whole accessory drive and its component by the Poly V belt. The industry trend continuing with larger alternators and smaller engines is increasing this problem. This includes belt slip, belt wear, component bearing durability and NVH. It is only the Litens OAD which provides the isolation required to solve the new challenges.

Just like an Overrunning Alternator Pulley (OAP, OWC) the Litens Overrunning Alternator Pulley (OAD) has an overrunning feature. Additionally the Litens OAD has a patented steel torsion spring inside. This spring is vehicle and application specific and is tuned to effectively absorb the torsional vibrations. The dynamic forces within the belt drive system are therefore dramatically reduced and the belt tensioner as well as the entire system's durability is greatly increased.

By using this patented system the noise, vibration and harshness in the accessory drive a reduced to a minimum. This also results in a higher driving comfort and increased lifetime of all components in the belt drive. Furthermore the fuel consumption can be reduced by using the Overruning Alternator Decoupler (OAD).

Function and Features

• Provides constant belt tension to maintain timing drive synchronization and controls belt meshing noise
• Prevents belt tooth skip
• Dampens belt vibrations caused by engine firing
• Tunes the timing drive for optimum performance
• Maintains alignment of belt
• Compensates for effects of engine thermal expansion and contraction on timing drive
• Adjusts for belt stretch and wear
• Application specific designs with a tuned tension level
• Patented and proven damping technology that provides quiet and smooth timing drive system operation
• “Anti-kickback” feature to prevent belt tooth skipping or jumping
• Precision pivot shaft design to ensure proper alignment of the belt
• Detailed engine specific installation procedure provided with each tensioner Function and Features

Function

• Provides constant tension to the belt to eliminate slip or noise
• Dampens belt vibrations caused by engine firing
• Tunes the accessory drive system for proper function
• Maintains alignment of the belt
• Automatically adjusts for belt stretch and wear

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.

Features

All brands of replacement automatic belt tension-ers 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 pro-vide pre-determined (‘engineered’), constant ten-sion & variable damping to the belt. The engi-neered output of these tensioners consistently maintain correct belt tension and help to dampen belt system vibrations, within the belt's replace-ment life.

The primary advantages of a well-designed automatic belt tensioner are:

• Maintains its correct alignment to the belt
• Automatically maintains correct accessory belt tension
• Automatically dampens normal accessory system vibrations
• Eliminates need to adjust / re-tension belts
• Prevents belt slip (noise / excessive belt wear)
• Optimizes life of belt
• Provides for indication of correct belt length
• Provides indication of excessive belt stretch (replacement)
• Improves belt system alignment
• Extends accessory system component life

Litens accessory drive tensioners provide:

• Equal or greater than Original Equipment quality and performance
• Custom, application-specific fit, form and function
• Quieter and smoother accessory drive operation
• Extended accessory drive component durability
• Constant ‘engineered’ belt tension
• Improved belt life

• The latest generation of Mercedes Crankshaft Isolator Pulley for Diesel applications
• Permits lowest operating belt tension
• Increases system durability
• Improves fuel economy
• Reduces emissions

Over 160 million vehicles worldwide are now equipped with the patented Litens Overrunning Alternator De-coupler (OAD). By 2022 the vehicle population using a Litens OAD will increase up to almost 220 million.

The fluctuating rotational speeds of the crankshaft cause tension peaks. These are transferred to the whole accessory drive and its component by the Poly V belt. The industry trend continuing with larger alternators and smaller engines is increasing this problem. This includes belt slip, belt wear, component bearing durability and NVH. It is only the Litens OAD which provides the isolation required to solve the new challenges.

Just like an Overrunning Alternator Pulley (OAP, OWC) the Litens Overrunning Alternator Pulley (OAD) has an overrunning feature. Additionally the Litens OAD has a patented steel torsion spring inside. This spring is vehicle and application specific and is tuned to effectively absorb the torsional vibrations. The dynamic forces within the belt drive system are therefore dramatically reduced and the belt tensioner as well as the entire system's durability is greatly increased.

By using this patented system the noise, vibration and harshness in the accessory drive a reduced to a minimum. This also results in a higher driving comfort and increased lifetime of all components in the belt drive. Furthermore the fuel consumption can be reduced by using the Overruning Alternator Decoupler (OAD).