Zylinderlaufbuchsen

Zylinderlaufbuchsen, often referred to as cylinder liners, are cylindrical inserts that fit into the cylinder block of an internal combustion engine. Their primary function is to provide a wear-resistant surface for the piston to reciprocate against. This surface is critical for maintaining the engine's compression, sealing, and overall efficiency.

These liners are typically made from materials like cast iron or hardened steel, chosen for their durability and ability to withstand the high temperatures and pressures encountered during combustion. The surface finish of the liner is also crucial, often featuring a cross-hatch pattern or honing that helps retain lubricating oil, reducing friction and wear between the piston rings and the liner wall.

There are two main types of cylinder liners: dry liners and wet liners. Dry liners are pressed into a bore in the cylinder block and are not in direct contact with the engine's coolant. They rely on the surrounding cylinder block for heat dissipation. Wet liners, on the other hand, are in direct contact with the coolant and are sealed at the top and bottom by O-rings. This direct coolant contact allows for more efficient heat transfer.

Over time, cylinder liners can wear out, leading to reduced compression, increased oil consumption, and potential engine damage. Replacement of worn liners is a common engine repair procedure, restoring the cylinder's integrity and performance. Their presence allows for easier and more cost-effective repair compared to replacing the entire cylinder block.