The locking spring washer, code 06.16169-0006.1, is designed to exert consistent tension on fasteners, helping to maintain clamping force in the MAN L21/31 engine even under thermal cycling and vibration. Its spring-like profile compensates for any loosening tendencies in bolted connections, ensuring mechanical reliability over time. Commonly used in high-stress areas, this washer is vital for the safe and uninterrupted function of engine components.