This forum is a good place to get some tips and suggestions for maintaining and troubleshooting problems of a less imperative nature...
...if you hear sounds that may indicate impending engine damage, then you should not waste time in getting a professional diagnosis.
We are limited in our efforts to offer any assistance, especially since we can't be there to personally "witness" problems as they occur. Digital pics help for static situations, but the interpretation of noises is at best, subjective. What may sound like a bearing going out to you may just be a belt tensioner, for example...or vice versa.
Please do seek a professional immediately...we want you to still have an MB to discuss in this forum...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car