The roller guide and push rods assembly, code P50801-15, is a vital mechanical linkage within the MAN L21/31 engine’s valve actuation system. The roller guide ensures smooth contact with the camshaft lobes, minimizing friction and wear, while the push rods transfer the cam motion to rocker arms, ultimately actuating the valves. This system guarantees precise valve timing, crucial for maintaining optimal combustion and efficient engine operation under various load conditions.