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A new series of 15.2 liter heavy duty diesel engine has been developed and launched into production by Komatsu Ltd. The in-line 6 cylinder direct injection engine covers the power range of 184 - 368 KW (250-500PS) for versatile applications. It is characterized by extremely low fuel consumption (minimum b.s.f.c. is 189 g/KW.h), low noise and good transient performance, which were achieved by various design features such as ductile cast iron pistons, unique intake port arrangement and underframe construction. Turbocharged and turbocharged aftercooled versions are currently available, however, higher output versions incorporating air-to-air aftercooling or two-stage turbocharging are being developed. This paper describes details of the development objectives and the design features of the S(A)6D140 engines.

Of all the parts used on crawler-type construction equipment, the track bushings in the undercarriage of large bulldozers are subjected to particularly severe load conditions. A new and innovative heat treatment technology has been developed in order to improve the durability of these bushings from the point of their wear and fatigue crack characteristics. A new steel material has also been specified to match this heat treatment technology. The bushings thus developed have been extensively tested on bulldozers in customer service and proved to be successfully applied for production. They also offer a possibility for considerable reduction in manufacturing cost.