The measuring points, code 300715, represent designated reference locations on the MAN L21/31 engine where dimensional, alignment, clearance, wear, or other condition-related measurements can be taken during assembly, inspection, maintenance, and overhaul. Clearly defined measuring points are important because they allow technicians to perform repeatable measurements and compare actual values with specified tolerances, previous inspection records, or expected wear limits. Depending on their location, measurements may help assess the condition and geometry of structural components, bearing arrangements, running clearances, or other critical engine areas where dimensional changes can influence reliability. Correct measuring instruments, consistent measurement procedures, clean reference surfaces, and accurate recording of results are essential for meaningful condition assessment. By supporting systematic inspection and early identification of wear, deformation, misalignment, or dimensional deviation, the specified measuring points contribute to effective preventive maintenance, informed overhaul decisions, and the long-term reliability of the MAN L21/31 engine.