Everything About Cylinder Liner And Its Types

Cylinder liners are important engine parts of the vehicle. It is a hollow cylindrical bore and acts like an enclosure in which the fuel’s combustion takes place. It is a cylindrical component that is fitted within the engine blocks, which offers the surface of the piston to reciprocate internally and continue its compression. You can easily replace these liners when it tears out. Manufacturing of cylinder liner The cylinder liner is usually made up of grey cast iron material to bear high strength. The centrifugal casting machinery method is followed to manufacture these spare parts. Grey cast iron is heated within the induction furnace. Then, the molten metal is placed in the centrifugal casting machinery. A permanent mold is rotated continuously along its axis at high speed. As a result of this, the molten metal is poured, causing the metal distributed evenly around the die. The impurities are forced to bore the surface as they are lighter than the iron. Later, they are eliminated by the machining due to the centrifugal force. The casting is finer grains and frees from blow holes compared to a usual casting process. You can improve the corrosion resistance with the addition of chromium. Types of cylinder liner Cylinder liners are classified depending on the method of its cooling. The categories of these are as follows. Dry cylinder liner: It is the most common type of cylinder liners. It is made up of cast iron and ceramic-nickel plating as it works on high temperature and pressure. Dry liner materials include mostly ceramic nickel compounds and cast iron, which provide several features that are not available in wet liners. A cylinder block with dry liners is a more robust wet cylinder liner. Dry liners are usually thinner than wet liners. Dry liners are not directly connected to the coolant. But it protects piston wear and tear of the piston, including impurities. Dry liners fix directly against the wall of the cooling jacket within the cylinder block. The replacement of the dry cylinder liner is easy. Wet cylinder liner: Wet type of cylinder liners are made up of cast iron and ceramic-nickel plating. Wet cylinder liners interact directly with the engine coolant to protect the piston and piston ring. Wet liners have developed heat dissipation and cooling than dry cylinder liners. Wet liners may have cooling water space between the liner and engine block. The water jacket is present within the wet cylinder liners. A static seal is essential at both the crankshaft and the combustion ends. It helps to prevent the leakage of the coolant within the combustion space or the oil pan sump. The wall of the cylinder liner needs to be strong enough to withstand the created combustion pressure. Wet cylinder liners are easy to manufacture. A cooling system is more effective, and a longitudinal force is relieved for the thermal expansion of the liner. Air-cooled or finned cylinder liner: It ensures long life and efficient cooling as it is made by following the special shell molding process. Air-cooled cylinder liner specifically made for air-cooled engines. These are mostly used in automobiles. Its working principles are like dry cylinder liners. But its cooling procedure is special. Heat dissipation of air-cooled liner is continued through the mode of forced convection by using its fins, which work on its surface. Usually, the material of fins has a high level of thermal conductivity. One of the most prominent of any cylinder liner is, it will enable fresh air to be led in for combustion and it is one of the most efficient parts of an engine. It is a cylindrical part which can be fixed into an engine block. In a typical design the liner is fitted in a positionally oriented manner in a corresponding receptacle.