The stopper ring K 42111 is a precision retaining and positioning component designed for the camshaft assembly of the Adriadiesel/Jugoturbina/Zgoda/Sulzer ZV40/48 engine. Its principal function is to help maintain the camshaft or an associated component in its specified axial position, restricting unwanted displacement and preserving the correct mechanical relationship between the camshaft, bearings, drive components, and neighboring parts. Although relatively simple in form, the stopper ring performs an important role because excessive axial movement can affect alignment, bearing conditions, gear engagement, and ultimately the accuracy and reliability of the camshaft mechanism. The K 42111 must therefore maintain its dimensional integrity and secure seating despite continuous vibration, cyclic mechanical loading, and long periods of engine operation. During overhaul, the stopper ring, its locating groove or seating surface, and the associated camshaft components should be inspected for wear, deformation, cracking, or other damage that could compromise retention. By maintaining controlled axial positioning of the camshaft assembly, the K 42111 stopper ring contributes to accurate alignment, stable camshaft operation, reduced mechanical wear, and dependable long-term performance of the ZV40/48 engine.