W211 E280 OM642.920 Torque settings for drive belt tensioner and pulleys

gauge boson

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E280 CDI 2006
Good morning folks

I have searched high and low and cannot get a definitive set of torque values for the three bolts holding my drive belt tensioner and two idler pulleys.

Most of the forums show a tensioner with two bolts, but mine only has one bolt; please see the attached diagram from my owners manual showing the three bolts in question.

Any help would be much appreciated as I am about to fit the the parts.

Many thanks and best regards
 

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