remain free of dirt dust and splinters which could of course destroy the engine then it is the turn of the camshaft components when it is fully assembled the shaft will be 6 meters long and weigh 400 kilograms to ensure that everything fits together the mechanics work with liquid nitrogen they sink dozens of small guide pins in a nitrogen bath with a temperature of minus 198 degrees Celsius the liquid gas chills the metal pins and makes them contract the super-cold guide pins can be tapped into the flange of the camshaft segment