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 in. bore and a 4.72 in. stroke produce a piston displacement of 359 cu. in. 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 165 hp, at engine speed of 2500 rpm. Maximum rated torque is 400 ft-lb at
engine speed of 1500 rpm.
b. Fuel System. Engine fuel system is described in Para 4-2.
c. Cooling System. Engine cooling system is described in Para 5-2.
d. Lubrication System. Engine lubricating oil is forced through various internal passages by an internally
mounted, gear type pump (1). Oil is cleaned by a disposable filter cartridge (2) and is cooled by engine coolant
flow through a cooler (3) mounted to the side of the engine. A pressure operated bypass valve (4) is
incorporated to provide continued oil flow around filter in the event filter becomes clogged. A differential
pressure of 20 psi will open filter bypass valve. A pressure regulating valve (5), located in the front of the
engine, is designed to open at a pressure of 60 psi to protect pump and other system components against