Fuel injector body with counterbore insert

A fuel injector assembly comprising:

• a fuel injector component that defines a pressurized fuel chamber;
• a check valve assembly in fluid communication with the pressurized fuel chamber;
• a plunger disposed in the pressurized fuel chamber;
• and
• a fuel injector body that includes a substantially cylindrical body defining a longitudinal axis, a radial direction, a first end along the longitudinal axis, a second end along the longitudinal axis, and a piston receiving cavity that extends longitudinally from the first end toward the second end terminating short thereof;
• a counterbore extending longitudinally from the second end toward the first end and defining a large diameter cylindrical portion proximate the second end,
• an intermediate diameter cylindrical portion extending longitudinally from the large diameter cylindrical portion toward the first end, and
• a small diameter cylindrical portion extending longitudinally from the intermediate diameter cylindrical portion toward the first end;
• and
• a first bore extending from the small diameter cylindrical portion to the piston receiving cavity and being aligned with a thru-hole that is defined by a head and a shaft of an insert and extends from an axial extremity of the head.

An insert for use with a fuel injector, the insert comprising:

• a shaft including an at least partially cylindrical configuration defining a shaft cylindrical axis, a shaft radial direction, and a shaft diameter;
• and
• a head including an at least partially cylindrical configuration defining a head cylindrical axis, a head radial direction, and a head diameter,
• wherein the shaft extends from the head along the shaft cylindrical axis,
• wherein the shaft cylindrical axis and the head cylindrical axis are parallel to each other,
• wherein the head diameter is greater than the shaft diameter, and
• wherein the shaft cylindrical axis is spaced away from the head cylindrical axis
• wherein the head and the shaft define a thru-hole, and
• wherein the thru-hole extends through an axial extremity of the head and is configured to align with a bore of a fuel injector body, of the fuel injector, that extends to a piston receiving cavity.