ARMY TM 9-2815-253-24
AIR FORCE TO 38G1-93-2
MARINE CORPS TM 2815-24/3
SECTION II. EQUIPMENT DESCRIPTION AND DATA
1-7.
GENERAL.
The diesel engine (FIGURE 1-1) is four cylinder, four cycle, fuel injected, naturally-aspirated and liquid-cooled. The firing
order is 1-3-4-2. The number one cylinder is toward the fan end of the engine. The serial number is found on right side
of the cylinder body at number one cylinder location. Rotation of engine is counterclockwise as viewed from flywheel.
NOTE
All locations referenced herein are given facing the flywheel end (rear) of the engine.
1-8.
DETAILED DESCRIPTION.
1-8.1. Cooling System. The cooling system consists of a radiator, water pump, cooling fan, thermostat and connecting
hoses. The fan is mounted on shaft of water pump and both are belt driven from the crankshaft pulley. The thermostat
controls engine temperature and is installed in the top of engine. The function of the cooling system is to maintain a
specific operating temperature of 1700 to 2200F (770 to 1040C) for the engine.
1-8.2. Lubrication System. The lubrication system consists of the oil sump, a gear type oil pump, pressure relief valve,
spin-on type oil filter and internal passages within the engine.
1-8.3. Fuel System. The function of the fuel system is to inject a metered quantity of clean atomized fuel into the engine
cylinders at a precise time near the end of the compression stroke of each piston. The fuel system consists of the fuel
tank, electrically driven transfer pump, fuel filter/water separator, fuel filter, and a fuel injection pump and fuel injector for
each cylinder. The fuel tank, transfer pump and fuel filter/water separator are not mounted on engine.
1-8.4. Electrical System. The electrical system is 24 VDC operation and consists of a battery charging alternator, starter,
externally mounted battery and other items as required. The battery charging alternator is mounted on front of engine
and is belt driven. When the engine is operating, the battery charging alternator supplies 24 VDC to recharge the battery
and maintain it at a full state of charge. The starter is mounted on the flywheel housing and when energized engages the
ring gear of the flywheel to rotate the engine.
1-9.
EQUIPMENT DATA.
TABLE 1-1. Equipment Data
Model ................................................................................................................................................................ DN4M
Type ...................................................................................................... Four cylinder, four cycle, liquid cooled diesel
Bore/Stroke .......................................................................................................................... 3.38/3.12 in. (86/80 mm)
Displacement .........................................................................................................................113.5 cu. in. (1.8 liters)
Horsepower Rating .......................................................................................................................24.1 BHP 1800 rpm
Compression Ratio ............................................................................................................................................18.5:1
Length ...................................................................................................................................... 24.56 in. (623.82 mm)
Width .........................................................................................................................................17.77 in. (451.4 mm)
Height ........................................................................................................................................20.57 in. (522.5 mm)
Weight .......................................................................................................................................... .305 lbs. (138.4 kg)
Rotation - looking at flywheel ........................................................................................................... Counterclockwise
Mean Piston Speed (1800 RPM) ..............................................................................................954 ft/min (288 m/min)
Number of Flywheel Ring Gear Teeth ..................................................................................................................... 96
Idle Speed ..................................................................................................................................................1745 RPM
Firing Order ..................................................................................................................................................... 1-3-4-2
Lubrication System Capacity ........................................................................................................... .5.9 qts (5.6 liters)
Coolant System Capacity (engine only) ........................................................................................ 0.79 gal (2.99 liters)
Oil Pressure ( 1800 RPM) .................................................................................................................. 36 psi (248 kPa)
Oil Pressure Relief Valve Setting ........................................................................................... 45-59 psi (310-407 kPa)
Capacity Between Dipstick Marks ................................................................................................... 38.4 oz (1.2 liters)
Oil Filter Capacity ........................................................................................................................... 8.5 oz (0.25 liters)
Alternator ......................................................................................................................................... 24 VDC - 18 amp
Starter................................................................................................................................................. 24 VDC - 3.2 kw
1-2
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