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


Original Litens brand, spring loaded tensioner assembly with smooth roller.

The roller/pulley itself,  is also available as a separate unit, WITHOUT the spring loaded tensioner. SEE BELOW...

These units are manufactured by Litens, the original factory supplier to Mercedes Benz and this unit is the identical tensioner sold at a Mercedes, Dodge or Freightliner dealer.  Many other brands have been known to break off at the pivot arm, due to an inadequate and/or poor design.
 
Part Number:  646 200 05 70
Dealer List  $125.48
Europarts Price:
$79.71
Savings:$45.77 (36%)
Qty: 
 
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: http://www.youtube.com/watch?v=4EXYP1CmL9Q&feature=relate


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