Choosing between a dry and a wet liner is one of the first questions in any repair or part selection. Both do the same job — they provide the running surface for the piston — but they differ in design, cooling and fitting. As a cylinder liner manufacturer, we explain the differences in practice.

Dry liner

A dry liner is thin-walled and pressed into an existing bore in the block. It has no contact with coolant — heat is removed through the block wall. It is used, among other things, to recondition blocks whose original bore has worn out.

• Thin wall, press-fit installation.
• Indirect cooling — through the block material.
• Ideal for repair and restoring the nominal dimension.

Wet liner

A wet liner is thick-walled and washed directly by coolant — its outer surface forms the wall of the cooling jacket. It provides very effective heat removal and is typical of many diesel engines and machines working under heavy load.

• Thick wall, sealed with O-rings at the base.
• Direct cooling — the best heat removal.
• Easier replacement without machining the block in many designs.

How to choose the right liner

1. 1Check the engine design — it determines whether you need a dry or a wet liner.
2. 2Establish the dimensions: internal diameter, length, flange and any oversize.
3. 3Match the material to the operating conditions (e.g. thermal load in diesel engines).
4. 4If in doubt, contact us — we also fulfill individual orders.

You cannot freely convert an engine from dry to wet liners — the liner type follows from the block design.