Vel Satis 2.2 dCi switch injection nozzles/motor damage repair

I got myself a wonderful S class from Renault to my Pajero V20. namely a Vel Satis 2.2 dCi switch. The car has 112,000 miles of dangers and Lief almost impeccable. Why almost it showed itself an injector damage, otherwise the engine was still like on the first day. well my mother wanted to drive the car absolutely once… ok, you can take my car to drive to Cologne after 650 km. I also told her especially because the injector damage started, please fa You slow not over 140 km/h that is not used to the car after all the last 200,000 km in England with shift limitation probably never faster than 130 dangers. What must she do 200 km/h at Karlsuhe downhill Brettern. . . . . . . . . . result behind Karlsruhe engine damage. Answer my mother, the Lief nevertheless so beautiful and he should be driven free times…… Well everyfals I have then disassembled the engine, result the injector of the 3rd cylinder has zuvie l Diesel EIn injected which means that the cylinder has overheated and the piston has more or less melted. According to nice, otherwise as far as everything looks healing, cylinder head can be repaired two valves were more or less milled through, a valve seat has been renewed, the cylinder has been honed, a set of nueue conduits bearing shells, and the smaller stuff like seals oils water and and and… after a few months that was I had built everything together again two weeks ago, and the First start made somewhat hesitant he came then. I then let him run warm in the stand. the next day again warm run. Then first driver search, almost hardly any power, strong black smoke which after about 15 km was almost gone, gradually came then also more and more power. Now after 70 km the motor has its normal power again, now I come to the actual point: I hear a clacker which sounds similar but different than before the engine damage. however, all 4 Injectors Checked (who has done the damage has been repaired) the other three have been judged by the Bosch service as fine. now I’m a bit perplexed what this could be? villeicht do you have an idea?