TM 5-3810-300-24 & P2
DRIVE TRAIN.
Engine. (Illus. 4-3).
The GM6-71N Diesel Engine is standard. The GM6-71N Diesel Engine has 6 cylinders. The general specifications for
the engine is listed below. The paragraphs to follow describe the Engine Systems that provide fuel, coolant, lubricating
oil, electric, and air. For detailed descriptions, refer to IN-LINE 71 OPERATORS MANUAL.
General Specifications:
NUMBER OF CYLINDERS
6
TOTAL DISPLACEMENT CU. IN. 426
BORE
4 1/4 in.
FIRING ORDER R.H. ROTATION 1-5-3-6-2-4-
STROKE
5 in.
L.H. ROTATION 1-4-2-6-3-5
COMPRESSION RATIO
18.7 to 1
Fuel System Components. (Illus. 4-4).
The Fuel System consists of fuel injectors, fuel piping, fuel pump, fuel strainer, and fuel filters. A restricted elbow is
located in the outlet manifold to maintain pressure in the fuel system between the inlet and outlet fuel passages.
Fuel is drawn from the supply tank through the fuel strainer and enters the fuel pump at the inlet side. Upon leaving the
pump under pressure, the fuel is forced through the fuel filter and into the fuel inlet manifold where it passes through fuel
pipes into the inlet side of each fuel injector. The fuel is filtered through elements in the injectors and atomized through
small spray tip orifices into the combustion chamber. Surplus fuel, returning from the injectors, passes through the fuel
return manifold and connecting fuel lines back to the fuel tank.
The continuous flow of fuel through the injectors helps to cool the injectors and remove air from the fuel system.
A check valve may be installed between the fuel strainer and the source of supply as optional equipment to prevent fuel
drain back when the engine is not running.
Fuel Injectors.
The fuel injector combines in a single unit all of the parts necessary to provide complete and independent fuel injection at
each cylinder. The injector creates the high pressure necessary for fuel injection, meters the proper amount of fuel,
atomizes the fuel, and times the injection into the combustion chamber.
4-9
