I've just started rebuilding an OM603 turbo motor, all is going well but I have never seen anything like this before.


Are these heat marks caused by a previous machining job on the crank ?


I have no history with this engine but it doesn't seem to be in too bad a condition. Rod bearings were worn but not too badly. From the info I have, the crank pins are within spec.


The rods do have a lot of movement on the crank. Is this a Mercedes thing ?


Thanks.