Product Description:
Cylinder Liners, also known as engine sleeves, reborer sleeves, wet liners, dry sleeves or simply “liners” are a replaceable wear part which can be changed during engine overhaul service, thus avoiding replacement of the much more expensive engine block. Many modern light duty engines are manufactured by OEMs without any cylinder liners, with the piston running directly inside the block. Such engines may also be rebored during overhaul to a bigger diameter and then a dry liner, or “sleeve” inserted in the rebored block to bring it back to nominal.
Cylinder Liners are crucial to reduce the total cost of ownership of any engine, by lowering its overhaul time frame and servicing costs. Using a liner is always the better option than using an oversize piston and piston rings on a rebored engine. The additional pressures and loads generated by increasing the volume of the combustion chamber using the latter method results in a shorter overall life of the engine.
In addition to this the cylinder liners serves the following important purposes:
Wear Part: It is designed to wear in a controlled manner to protect more expensive parts like pistons and engine block from wearing.
Sealing: It provides a surface against which piston rings can slide with minimum possible friction and maximum sealing, to prevent combustion gases from escaping into the crankcase or lubricating oil from entering the combustion chamber.
Heat Sink: Conducts heat due to combustion, away from the combustion chamber and into the coolant.
Classified broadly into monolithic, inserted and bonded designs, the insert technology liners are by far the dominant design due to their ease of repair and lower costs to recondition the block. Within the insert technology cylinders, the main types are:
WET LINERS
There are over 2000 different WET cylinder liners in range of AutoGRACE® Cylinder Liners
Usually used in medium and heavy duty applications
Are in direct contact with cooling fluid, hence called “WET”
Since collar is used to centre the liner within the block, superior cooling is achieved at the top end
AutoGRACE® Wet Liners are machined to extremely close tolerances on inner and outer diameters, eliminating misalignment and minimizing deformation. Roundness tester by Mitutoyo®, Japan is used to test roundness, concentricity, perpendicularity and other geometric parameters of the liner.
Sealing grooves are machined exactly as per OEM specifications to prevent leakage of cooling fluid into the block. Contracer equipment by Mitutoyo®, Japan is used to trace the profile of the groove under the collar and each sealing groove.
DRY SLEEVES
AutoGRACE® brand has developed more than 5000 different sizes in Dry Sleeves
They are used for light and medium duty applications usually
Since they are pressed or shrink-fit into the block, they are not in direct contact with the cooling fluid, hence the term "DRY"
Dry liners are finished to an extremely smooth surface finish on the outer diameter to promote conduction of heat away from the cylinder and into the block
Available in both types: SF (semi-finished bore) and FF (fully finished bore)
In addition to standard sizes,AutoGRACE® sleeves are also available in any oversize / undersize as per customer requirements
AIR-COOLED LINERS
Used mostly in older medium and heavy duty engines
AutoGRACE® Air Cooled Liners are made from Shell Mould Casting process, giving high quality of finish to the cooling fins and outer profile of the liner
In addition to engine liners, air-brake compressor liners are also available in Air-Cooled design
Additional Information:
Production Capacity: 100000 Per Month
Delivery Time: 60 Days
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