I've read of original tensioners seizing, but not snapping (yet). There are many reports of aftermarket INA tensioners snapping though. INA blames seized clutched alternator pulleys (the pulley is recommended to be replaced every 100K), but the INA tensioner most parts retailers supply is an outdated/superseded design for either the OM647 or OM648 engine (installed in Sprinter vans and E320 CDI).


Litens is the correct OEM for the tensioner and as far as I know (besides buying OE MB), the only supplier to offer the Litens tensioner is Gates. INA is the correct supplier for the idler pulleys and clutched alternator pulley though. Use OE MB or ContiTech for the correct length serpentine belt.