Overrunning Crankshaft Decoupler Pulley (OM651) - replacement interval?

colvan

New member
Greetings -



At 265K km, I made a serpentine belt, pulley, water pump and tensioner swap on my late 2013 Sprinter with OM651 motor. I was also armed with a freewheeling alternator pulley to change out.


Soon discovered that the motor in my van is fitted with a Coupler Pulley not on the alternator, but on the crankshaft. The alternator pulley is solid/fixed. The whole belt assembly grips in the one direction, and freespins in the other.


The part number on the crankpulley was very difficult to read.. Litens is stamped on the front.
Gleaned from an online parts catalog.. looks like the MB part number is A651 035 1812.

No other info online..


Upon inspection, the pulley is smooth in freewheel, can feel smooth engagement on the spring in drive not rough, no noise.. I say it's good for while longer.

However, would hate for the pulley come undone give it drives all on the Alternator, Water pump, Mechanical Fan, Power Steering and AC and this van only ever see long distance drives.


The crank pulley on my van looks very much like this:




Hoping someone can maybe shine some light on this part:

What's the recommended replacement interval?
Anyone had one fail?
Is this available on the aftermarket?



Very much appreciated in advance.
Best
 

colvan

New member
Following up with info received from the manufacturer.

The part is called a Torqfilter.

Mercedes recommended replacement interval is 240,000km.
Not available on the aftermarket.
A6510351812 is the Mercedes part number.
 

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