Not sure where you would get it, but many industrial epoxy and paint strippers contain methylene chloride which should not harm the metal. The parts will need to be immersed in the solvent. How long it will take depends on the specific epoxy formulation and the amount of surface area of the epoxy that is direct contact with the solvent. The solvent does not completely dissolve the epoxy but causes it to soften, swell and lose adhesion to the metal surface so it can be easily removed mechanically. Methylene chlorde does need to be used in a well-ventillated area.
