Abstract: An inserting device for automated assembling of cone half-bits on the stem of a valve of an internal combustion engine, has an inner chamber at one end which is isolated from outside due to the engagement of the inserting device on the end of the valve when this device carries out the assembling of the cone half-bits. Immediately after assembling, pressurized air is introduced into this chamber and a check is carried out on whether there are any pressure losses in this chamber caused by air leakages due to improper assembling of the cone half-bits.

Abstract: A device for automated assembling of cone half-bits on a valve of an internal combustion engine has a pushing rod which is introduced inside a plurality of longitudinal petals which are elastically deflectable outwardly in a radial direction, said petals being adapted to be introduced between the two cone half-bits so as to cause them to diverge from each other during the assembling operation.