Cylinder liner for Mercedes-Benz OM421

The cylinder liner 003WN26 serves as the internal sleeve for the engine block, creating the combustion chamber where the piston travels. It provides a precise surface for the piston rings to maintain compression and manages the transfer of heat from the combustion process to the engine cooling system. Proper installation of this component is necessary to ensure the integrity of the cylinder assembly and to maintain the operational efficiency of the power unit.

This component is designed for the Mercedes-Benz OM421 engine. It is installed within the engine block to facilitate the reciprocating motion of the piston assembly. By maintaining a consistent seal, the liner prevents blow-by and helps regulate oil consumption during the engine cycle. It is a standard component used in the maintenance of this specific engine series to restore cylinder wall geometry and combustion pressure.