The piston rings, code P50605-02, form a critical seal between the piston and cylinder wall in the MAN L21/31 engine. Typically consisting of compression and oil control rings, they serve to contain combustion gases, transfer heat from the piston to the liner, and regulate oil consumption. Manufactured with precision and durability in mind, these rings ensure proper sealing, reduced blow-by, and optimized lubrication—key factors in prolonging engine life and maintaining consistent performance under harsh operational conditions.