RIM AS 4750570 - Caterpillar

Typical mid-life wear pattern of liner caused by plasma top piston ring. Note that the original factory crosshatching is still quite visible except for the slight wear step area at the extreme top.Spots where the crosshatch is polished away at mid-stroke indicate that a liner has worn to an out-of-round condition, and can be the cause of an oil consumption complaint. These polished spots are NOT caused by plasma coated rings, but rather by piston deposits. These deposits are a function of oil and fuel quality, oil and fuel usage rates, maintenance and application.
... Piston, ring and liner reliability are significantly increased.... Total engine life to overhaul is maintained.... The wear ridge area at the top of the liner is not a factor for the acceptance of liner cores.... Piston deposits, which are controllable, wear off the liner crosshatch, which can cause excessive oil consumption.... The Remanufactured Cylinder Kit comes with the rod and piston assembled in the liner. Use the 6V9448 Cylinder Liner Puller Group to quickly pull out the former liner, piston and rod as a unit, and to prevent broken rings. Using this tool and the kit make a significant reduction in repair time.... Liner reusability at overhaul is decreased.