The filling piece, code 101977, is a precisely dimensioned component of the MAN L21/31 engine designed to occupy a defined space within an assembly and thereby provide the required support, spacing, positioning, or load distribution between associated components. Depending on its particular installation location, the filling piece may compensate for a designed gap, establish the correct relative position of adjoining parts, provide a stable contact surface, or help transfer mechanical forces through the assembly. Dimensional accuracy, surface condition, material strength, and correct positioning are particularly important because an incorrectly fitted or damaged filling piece can alter clearances, alignment, contact patterns, or load distribution. During maintenance and overhaul, the component and its mating surfaces should therefore be inspected for wear, deformation, corrosion, fretting, surface damage, and dimensional deviations before reassembly. By maintaining the specified geometry and mechanical relationship between associated parts, the filling piece contributes to accurate assembly, structural stability, reduced unwanted movement, reliable load transfer, and the dependable long-term operation of the MAN L21/31 engine.