Patent ID: 7025025

Claim:
A method for manufacturing an assembly, comprising the steps of: a) providing a socket including: i) an outer socket surface, a first socket surface, a second socket surface, and a socket passage; ii) the outer socket surface has been, at least in part, cold formed and is configured to cooperate with a second inner lifter surface of a valve lifter body; iii) the first socket surface has been, at least in part, cold formed to include a push rod cooperating surface that defines a first socket hole that links the first socket surface with the socket passage; iv) the second socket surface defines a second socket hole that links the second socket surface with the socket passage and has been cold formed to include a protruding surface, a first flat surface, and a second flat surface, wherein the protruding surface is located between the first flat surface and the second flat surface; b) providing a leakdown plunger that has been fabricated, at least in part, through cold forming and includes: i) a first plunger opening and a second plunger opening that have been fabricated at least in part through cold forming; ii) an outer plunger surface enclosing an inner plunger surface; iii) the first plunger opening is provided with an annular plunger surface defining a plunger hole shaped to accommodate an insert; iv) the second plunger opening is configured to cooperate with the socket; c) machining, at least in part, an undercut plunger surface into the outer plunger surface so that the undercut plunger surface is located closer to the second plunger opening than the first plunger opening and the undercut plunger surface forms a leakdown path with the valve lifter body; d) providing the valve lifter body that includes: i) an outer lifter surface that encloses a first lifter cavity and a second lifter cavity; ii) the first lifter cavity has been fabricated, at least in part, through cold forming to include a first inner lifter surface and a first lifter opening shaped to accept a roller; and iii) the second lifter cavity includes the second inner lifter surface and a second lifter opening, wherein the second inner lifter surface is configured to accommodate the socket and the leakdown plunger and has been machined, at least in part, to include a plurality of cylindrical surfaces.