ARMY TM 9-6115-671-14
AIR FORCE TO 35C2-3-446-32
MARINE CORPS TM 09249A/09246A-14A
1-24
1.16.8
Engine Cooling System.
1.16.8.1
The Engine Cooling System (Figure 1-24) consists of a radiator, hoses, thermostat, coolant temperature
sender, CIM display screen COOLANT TEMP indicator, water pump, oil cooler, cooling fan, and
cooling jackets (part of engine).
1.16.8.2
The water pump forces coolant through passages (cooling jackets) in the engine block and cylinder
head where the coolant absorbs heat from the engine. When the engine reaches normal operating
temperature, the thermostat opens and the heated coolant flows through the upper radiator hose
assembly into the radiator. The cooling fan circulates air through the radiator where the coolant
temperature is reduced.
1.16.8.3
The DCS, in conjunction with the fault system, provides automatic shutdown in the event coolant
temperature exceeds 230
5°F (110 ± 3°C). The CIM display screen COOLANT TEMP indicator
indicates the engine coolant temperature from 100°F to 250°F (38°C to 121°C).
1.16.8.4
The water pump also circulates coolant through the engine oil cooler to cool the engine oil.
1.16.9
Lubrication System.
1.16.9.1
The Engine Lubrication System (Figure 1-25) consists of an oil pan, dipstick, pump, oil cooler, oil
sample valve, oil pressure sender, CIM display screen OIL PRESSURE indicator, oil drain valve, and
filter.
1.16.9.2
The oil pan is a reservoir for engine lubricating oil. The dipstick indicates oil level in the pan. The oil
level can be checked during engine operation. One side of the dipstick is used for checking oil level
while the engine is running and the other side is used while the engine is shut down. The pump draws
oil from the oil pan through a screen which removes large impurities. The oil then passes through tubes
in the oil cooler. Engine coolant from the engine cooling system is circulated around the tubes to cool
the oil. From the cooler, oil passes through a spin-on type filter where small impurities are removed.
From the filter, oil is distributed to the engine and turbocharger moving parts and then returns to the oil
pan. The oil pressure sender located in the engine block senses oil pressure. Oil pressure is displayed
on the CIM display screen OIL PRESSURE indicator. An Army Oil Analysis Program (AOAP)
sample valve located in the block allows oil samples to be taken while the engine is operating. The
DCS automatically shuts off the engine if oil pressure drops below 15
3 psi (103.4
20.7 kPa).
1.16.10
Engine Air Intake and Exhaust System.
1.16.10.1
The Engine Air Intake and Exhaust System (Figure 1-26) consists of an air cleaner assembly, intake
manifold, ether supply tank, ether solenoid valve, ETHER START switch, exhaust manifold,
turbocharger, muffler, and crankcase breather filter. The air cleaner assembly includes a dust collector,
filter element, restriction indicator, and dust evacuator valve.
1.16.10.2
Air is drawn into the dust collector and passes through the filter element. Airborne dirt is removed and
trapped in the dust collector and filter element. Some dust can be removed from the dust collector by
pinching the evacuator valve. The restriction indicator indicates when the filter should be serviced.
Filtered air is drawn out of the filter through air intake tubes into the turbocharger where it is
compressed and forced into the engine.
