The glues, code 395956, refer to specialized industrial adhesives and securing compounds specified for particular assembly, maintenance, and repair operations on the MAN L21/31 engine. Depending on the application, these products may be used for thread locking, retaining cylindrical components, sealing threaded or mating connections, securing assembled parts, or providing additional resistance against loosening and leakage. Adhesives intended for engine service must be selected according to the specific application and should provide appropriate resistance to vibration, temperature variations, lubricating oil, fuel, moisture, and other operating media or environmental influences to which the joint may be exposed. Thorough cleaning and preparation of the bonding surfaces, correct application quantity, suitable assembly conditions, and observance of the required curing time are essential for obtaining the intended performance. When correctly selected and applied according to the prescribed procedure, these glues can improve connection security, support effective sealing, reduce maintenance-related problems, and contribute to the dependable and long-term operation of the MAN L21/31 engine.