TM 5-3810-300-24 & P3
General Information
GENERAL DESCRIPTION
main bearings and connecting rod bearings via the drilled
The two-cycle diesel engines covered in this manual are
crankshaft.
produced in 3, 4 and 6 cylinder models having the same bore
and stroke and many of the major working parts such as
Coolant is circulated through the engine by a centrifugal-type
injectors, pistons, connecting rods, cylinder liners and other
water pump. Heat is removed from the coolant, which
parts that are interchangeable.
circulates in a closed system, by the radiator. Control of the
engine temperature is accomplished by a thermostat which
The blower, water pump, governor and fuel pump form a group
regulates the flow of the coolant within the cooling system.
of standard accessories which can be located on either side of
the engine.
Further flexibility in meeting installation
Fuel is drawn from the supply tank through the fuel strainer by
requirements can be had by placing the exhaust manifold and
a gear-type fuel pump. It is then forced through a filter and
the water outlet manifold on either side of the engine (Fig. 2).
into the fuel inlet manifold in the cylinder head and to the
This flexibility in the arrangement of parts is obtained by
injectors. Excess fuel is returned to the supply tank through
having both the cylinder block and the cylinder head
the fuel outlet manifold and connecting lines. Since the fuel is
symmetrical at both ends and with respect to each other.
constantly circulating through the injectors, it serves to cool
the injectors and also carries off any air in the fuel system.
Each engine is equipped with an oil cooler, full-flow lubricating
oil filter, fuel oil strainer, fuel oil filter, air cleaner, governor, fan
Air for scavenging and combustion is supplied by a blower
and radiator, and starting motor.
which pumps air into the engine cylinders via the air box and
cylinder liner ports. All air entering the blower first passes
Full pressure lubrication is supplied to all main, connecting rod
through an air cleaner.
and camshaft bearings, and to other moving parts within the
engine. A gear-type pump draws oil from the oil pan through
Engine starting is provided by an electric starting motor
an intake screen, through the oil filter and then to the oil
energized by a storage battery. A battery charging generator,
cooler. From the oil cooler, the oil enters a longitudinal oil
with a suitable voltage regulator, serves to keep the battery
gallery in the cylinder block where the supply divides; a portion
charged.
entering the by-pass filter, if used, and then draining back into
the oil pan, part going to the cam and balance shaft end
Engine speed is controlled by a mechanical governor.
bearings and cylinder head, with the remainder going to the
GENERAL SPECIFICATIONS
6-71
Type...................................................................................................
2 Cycle
Type...................................................................................................
2 Cycle
Number of Cylinders ..........................................................................
6
Bore (inches) .....................................................................................
4.25
Bore (mm)..........................................................................................
108
Stroke (inches) ..................................................................................
5
Stroke (mm) .......................................................................................
127
Compression Ratio (Nominal) (Standard Engines) ...........................
17 to 1
Compression Ratio (Nominal) ("N" Engines) .....................................
18.7 to 1
Total Displacement - cubic inches .....................................................
426
Total Displacement - litres .................................................................
6.99
Firing Order - R.H. Rotation ..............................................................
1-5-3-6-2-4
Number of Main Bearings ..................................................................
7
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