I WOULD contact MERCEDES BENZ of NA and State To The CUSTOMER hotline ... That You are aware that this IS A PROBLEM with the V6/V8 112/113 ENGINES And You Would LIKE SOME HELP with the Pulley ...Be NICE and MB should help out...the Whole JOB or 50/50 You Pay for HALF...?
I Would Try this FIRST!

BTW Yes the Crank Pulley is Made with a Dampner in the HUB as a close Inspection will tell you this a thin space of rubber all the way around the ring! And Thats WHAT WILL FAIL!!!


Good Luck