Electronic ignition timing coil replacement method

Abstract

An inexpensive and reliable tool accurately orients pick-up core assembly and checks the bushing runout in an electronic ignition unit for automobile. The tool includes a T-shaped member having a precisely formed centering and locating shaft of a precise length in combination with an integral core locating plate radially projecting from the locating shaft. The length of the pin or shaft is selected to precisely locate the core locating plate. The electronic ignition unit includes a magnetic trigger unit having a trigger coil mounted within a distributor. An annular magnetic core has pyramidal trigger elements and the rotor has closely spaced opposed pyramidal trigger elements. Accurate, precise location of the pyramidal elements and the sharp opposed edges are critical to proper ignition. The tool has the shaft located within the rotor bushing and precisely locates the locating plate, which precisely locates the core in precise concentric aligned orientation to the rotor axis. The tool may be formed for one ignition module unit with the locating plate formed having a precisely formed annular face which is precisely parallel and concentrix with the periphery of the locating pin. Alternatively, the locating plate is formed with a chamfered edge face, with the chamfer precisely located and constructed to provide alternate annular surfaces for different ignition module units.