The finish machining of spanner, code 11.49001-0533.0, represents the high-precision tooling required for servicing the MAN L21/31 engine. Properly machined spanners ensure accurate torque application, protecting critical fasteners from damage during assembly and maintenance. This tool not only improves efficiency in routine service but also upholds safety and reliability standards, making it an indispensable asset for marine engineers and technicians working on MAN diesel engines.