Higher horsepower John Deere cylinder liners are carefully engineered and manufactured to provide maximum trouble-free life.  All cylinder liners are made from high-strength iron that is centrifugally cast to obtain a uniformly dense microstructure.  This centrifugal casting process consists of pouring the molten iron into a rotating mold.  The impurities are spun to the outer surface that is then machined off.  All liner surfaces are fully machined to ensure that only quality material remains.

Cylinder liners for turbocharged engines are induction hardened and tempered on the inner surface to reduce wear.  Liners for naturally aspirated engines do not require this additional hardening operation, but still provide long life.

The cylinder bore is carefully machined and plateau-honed to product a crosshatch pattern which retains oil.  This aids break-in of piston ring surfaces and promotes precise limits to minimize oil consumption and to eliminate ring scuffing.  Automated measuring equipment precisely measures diameter and roundness through the liner bore so that liners can be matched to John Deere pistons for best performance.

The matching of liners and pistons for service in many four- and six-cylinder late model engines is only one of the elements which are engineered into the cylinder block, cylinder liner, and piston assemblies in order to promote greater engine durability.  Extensive laboratory testing has developed the optimum liner machining tolerances for each John Deere engine in order to assure the best oil control and longest engine life.

Liners are 100-percent inspected.  A liner that fails to meet specifications is rejected and scrapped to ensure that our customers always receive the very best liners.