Patent ID: 7552909

Claim:
A fuel injector with adjustable-metering servo valve for an internal-combustion engine, comprising: a casing housing the servo valve and an actuator having a mobile member for controlling a shutter of the servo valve and an element of arrest for defining an opening stroke of said mobile member, said element of arrest being fixed in said casing by a threaded member acting on a hollow body provided with a first annular surface of contact with said actuator; at least one shim being set between said element of arrest and a portion of said casing, said threaded member being screwed with a pre-set tightening torque on a thread of said casing so as to determine a corresponding tightening load on said least one shim, wherein said at least one shim is formed with a material having a hardness different from that of the material of said element of arrest or of said casing; an annular projection having a second annular contact surface being provided between said element of arrest and said casing, said second contact surface being contained, at least in part, in the area corresponding to said first contact surface so as to adjust said opening stroke of said mobile member by a pre-set plastic deformation of said least one shim or said element of arrest as a function of said tightening torque.