Method of remanufacturing a prechamber assembly

A remanufactured prechamber assembly, comprising:

• a remachined body assembly;
• a new prechamber housing welded to the remachined body assembly along a new circumferential weld joint;
• wherein:
• one of a distal end portion of the remachined body assembly and a proximal end portion of the new prechamber housing includes a reduced diameter portion;
• and
• an axial length of the reduced diameter portion is configured to be fitted in a counterbore formed at the other of the distal end portion of the remachined body assembly and the proximal end portion of the new prechamber housing;
• and
• a new circumferential weld bead extending around and joining a proximal end of an outer peripheral wall of the new prechamber housing and a distal end of an outer peripheral wall of the remachined body assembly along the new circumferential weld joint, and the new prechamber housing abuts the remachined body assembly at a location that is radially inward of the new circumferential weld bead;
• wherein a centerline of the new circumferential weld bead is spaced axially along the outer peripheral wall of the remachined body assembly toward a proximal end of the remachined body assembly from a location of a centerline of an original circumferential weld bead at an original circumferential weld joint around a distal end of the outer peripheral wall of the body assembly by a distance of 2.5-3 times a width W of the original circumferential weld bead as measured in an axial direction parallel to a central axis of the prechamber assembly;
• and,
• wherein a heat affected zone of the original circumferential weld bead extending cirucumferential around the center axis is removed.

A method of remanufacturing a prechamber assembly, the prechamber assembly including a used prechamber housing welded to a body assembly, wherein a distal end portion of the body assembly includes a reduced diameter portion, a proximal end of the used prechamber housing includes a counterbore configured to receive the reduced diameter portion of the body assembly, and an original circumferential weld bead extends around and joins a proximal end of an outer peripheral wall of the used prechamber housing and a distal end of an outer peripheral wall of the body assembly along an original circumferential weld joint, the method comprising:

• determining a width W of the original circumferential weld bead as measured in an axial direction parallel to a central axis of the prechamber assembly;
• cutting through the weld bead in order to separate the used prechamber housing from the body assembly;
• removing material from an outer peripheral portion of the distal end portion of the body assembly, wherein the material is removed in an axial direction parallel to the central axis of the prechamber assembly for a distance that is from 2.5-3 times the width W;
• and
• removing material from the outer peripheral portion of the distal end portion of the body assembly, wherein the material is removed in a radial direction relative to the central axis of the prechamber assembly to create a reduced diameter distal end portion of the body assembly that is from 2.4 W to 4 W smaller than the diameter of the outer peripheral surface at the distal end of the outer peripheral wall of the body assembly,
• welding the replacement prechamber housing to the body assembly with a new circumferential weld bead;
• and
• fitting the reduced diameter distal end portion of the body assembly into a counterbore at a proximal end of a replacement prechamber housing, prior to the welding of the replacement prechamber housing to the body assembly, such that the replacement prechamber housing abuts the body assembly at a location that is radially inward of the new circumferential weld bead;
• wherein removing material comprises removing a heat affected zone of the original circumferential weld bead extending circumferentially around the central axis, based on the removal of material from an outer peripheral portion of the distal end portion of the body assembly.