TM10-3930-660-34 CHAPTER 3 ENGINE SYSTEM MAINTENANCE Section I.  DESCRIPTION AND DATA 3-1.  GENERAL. This chapter covers maintenance procedures for the engine system components, as well as principles of operation. 3-2.  PRINCIPLES OF OPERATION. a.    Construction.  Engine is a six cylinder, inline, four-stroke-cycle, turbocharged, fuel injected, liquid cooled diesel.  A 4.02 inch bore and a 4.72 inch stroke produce a piston displacement of 359 cu.  inch.  Engine firing order is 1, 5, 3, 6, 2, 4 and  engine  rotation  is  clockwise,  as  viewed  from  front  (fan)  end.    Cylinder  number  1  is  closest  to  fan.    Rated horsepower is 152 hp, at engine speed of 2500 rpm.  Maximum rated torque is 400 ft.  lbs.  at engine speed of 1500 rpm. 3-1