the power units as they are known each power unit has a capacity of 17.5 litres and is basically an independent single cylinder engine the workshop also contains the pre assembly site for the power units before assembly of the cylinders can get underway the huge connecting rods have to be measured this includes measuring the bearing shells because if the bearing shells are too small this could damage the crankshaft all the measurements are recorded exactly to ensure precise positioning then the war can begin the fitters first prepare the