Paul was correct!!
ON the M102 engine & most other MB's the timing chain tensioner MUST be dis-assembled & reset before re-installing back into the engine. IF not there is too much tension & the cam will break as it is hollow! Have seen that problem at least 4-5 times when the "mechanic" doesn't have MB engine knowledge!
IT was his fault for not reading correct info on removing & installing the tensioner!
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