Method of refurbishing a fuel injector

摘要

Methods are disclosed to refurbish a fuel injector to original manufacturing operational tolerances.

主权项

1. A method to refurbish a fuel injector having at least one three way, two position magnetic valve module (MVM), said MVM having a valve stem body moveable within a two component body having a first and second body component in sealing engagement with each other, said valve stem including a needle having an elongated body, with a spool having a spool edge, said needle body moveable within a needle guidance bore carried by one body component, said spool edge cooperatively engagable with a surface on said second body component; and needle valve seatable within a magnetic valve needle seat carried in said other body component; said method comprising;
determining from which part of the valve body to remove an amount of material sufficient to remove wear, cavitation and fuel erosion; removing a sufficient amount of material from said worn MVM part to remove wear, cavitation and fuel erosion; determining from which part of the MVM to remove an amount of material to ensure manufacturing tolerances of valve stroke and spool overlap are maintained and removing a sufficient amount of material from another part of the MVM assembly to ensure manufacturing tolerances of valve stroke and spool overlap are maintained for the MVM.