Pistons each of which has a diameter of 27 centimeters weighing 100 kilograms each con rod can only be moved with a crane the con rod is carefully lowered into the piston the retaining bolt is then slid into place it takes a quarter of an hour to install the first of 20 Pistons next the focus is on the complex cylinder head on the rotary table the fitter inserts four bolts and secures the cylinder liner with another 24 bolts to guarantee precision they are tightened automatically by a machine the process is fully automated and monitored