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Serpentine Belt Tensioner Assembly 2002-2006
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Serpentine Belt Tensioner 2002-2006

Spring loaded tensioner with smooth roller.

The roller/pulley is NOT available as a separate unit.

These units are manufactured by Litens, the original factory supplier to Mercedes Benz, and this unit is the identical tensioner sold at a Dodge or Freightliner dealer.  Many other brands have been known to break off at the pivot arm, due to an inadequate and poor design.
Dealer List  $138.00
Europarts Price:
Savings:$58.07 (42%)
Detailed Description
Sprinter 2002-2006

Please note that there are two options when installing a belt with this unit. You can use either a 12 point 17 mm box wrench/socket or a T-60 Torx head when installing the serpentine belt.

If you have had premature failures of this tensioner or the serpentine belt has broken or been thrown, you most likely have a failed alternator pulley.  The alternator pulley is a decoupling pulley and has a one-way clutch mechanism to minimize belt flutter.  Belt flutter places stress on the entire belt drive system and the tensioner acts as a spring-loaded shock absorber.  If the decoupling pulley has seized, it will greatly shorten the life of the belt tensioner and often causes the pulley to break off or a fracture of the pulley arm.  Replace the alternator pulley or the alternator to solve this problem.

Video demonstration of why the decoupling pulley is a critical component: 

There is a lot of very good and easy to understand information here.


Here is a second video:

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