Cylinder liners

The original KS Kolbenschmidt cylinder liners are, thanks to our decades of experience with piston- cylinder systems, perfectly coordinated. For this reason they provide the optimum solution with regard to wear, durability and heat dissipation.

We stock standard sizes and oversize versions of dry and wet cylinder liners for the engines of all major manufacturers.

Air-cooled cylinders for air-cooled engines, compressor cylinders and liner castings round off the product range.

Air cooled cylinder

Compressor cylinder

Cylinder sleeves


Cylinder liner with fire ring

Fire rings are placed at the top end of the cylinder liners in a rectangular slot. The fire ring is loosely inserted into the slot during assembly and is subsequently held in position by the cylinder head.

A fire ring or oil scraper ring prevents a hard coating of oil carbon from forming on the head land of the piston. This is achieved by the smaller internal diameter of the fi re ring compared to the diameter of the cylinder bore.

As the piston passes through the top dead centre, the fire ring scrapes the unwanted oil carbon deposits off the piston and prevents deposits from forming on the head land.


The piston is adapted for the use of a fire ring. The head land has a smaller diameter than comparable pistons of conventional design. When just replacing the piston it needs to be ensured that it is suitable for use of the cylinder liners with fire ring.


Cylinder liner with free rotation

Cylinder liners with free rotation have a larger diameter in the upper cylinder area.

The enlargement ensures a thicker formation of the oil carbon layer in  this area that keeps the fire land of the piston free of deposits. Oil carbon has abrasive properties.


When using cylinder liners with a free rotation, you must ensure that the first compression ring of the piston does not protrude into the free rotation area. For this reason, it is only permitted to use pistons on the cylinder liners where the fire land height on the piston is greater than the free rotation height. Damage to pistons and cylinder liners will result if this is not observed.