ARMY TM 9-6115-644-24
AIR FORCE TO 35C2-3-446-12
MARINE CORPS TM 09249A/09246A-24/2
1-12-4-3 A coolant high temperature switch in conjunction with the fault system provides automatic shutdown in the event
that coolant temperature exceeds 225 ± 5° F (107 ± 3 C). The COOLANT TEMP. indicator displays the engine coolant
temperature, from 120° F TO 240° F (49°C TO 116°C).
1-12-44 The water pump also circulates coolant through the engine oil cooler to cool the engine oil.
Engine Lubrication System.
1-12-5-1 The Engine Lubrication System (FIGURE 1-6) consists of an oil pan, dipstick, pump, oil cooler, oil sample valve,
oil pressure sender, OIL PRESSURE indicator, low oil pressure switch and filter.
1-12-5-2 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 shutdown. The pump draws oil from the oil pan through a screen removing 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 cod the oil. From the cooler, oil passes through a spin-on type filter where small impurities are re-
moved. 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. The oil pressure is displayed on the 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 low oil pressure switch, also located in the engine block, functions with the generator set fault
system. The engine is automatically shut off if the oil pressure drops below 15+3 psi (103.4 ± 20.7 kPa).
1-12-6 Engine Air Intake and Exhaust System.
1-12-6-1 The Engine Air Intake and Exhaust System (FIGURE 1-7) consists of an air cleaner assembly, intake manifold,
ether supply tank, ether solenoid valve, ETHER switch, exhaust manifold turbocharger, crankcase breather filter, and muf-
fler. The air cleaner assembly includes a dust collector, filter element, restriction indicator and dust evacuator valve.
1-12-6-2 Air is drawn into the dust collector and passes through the filter element. Airtime 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.
1-12-6-3 The engine exhaust gases are expelled into the exhaust manifold and ported to the turbine of the turbocharger.
The turbine drives the turbocharger compressor which compresses the intake air. Exhaust gases discharged by the turbo-
charger are channeled into the muffler that deadens the sound of the exhaust gases. The gases pass from the muffler
through the muffler outlet and are vented upward from the generator set housing. A rover, which is held open by the pres-
sure of the exhaust gases during operation, doses over the exhaust port to prevent rain, water, or other foreign matter
from entering the exhaust port when the set is not in use. The cover is easily removed for connection of an exhaust pipe
for indoor operation.
1-12-64 Combustion gases which enter the crankcase are filtered through the crankcase breather filter to remove oil
droplets and are then recycled through the intake manifold.
1-12-6-5 An ether supply system is provided to improve engine starting when outside ambient air temperature is below
40° F (4° C). The ether system includes an ether supply tank, ether solenoid valve, ETHER switch, and piping from the
solenoid valve to the intake manifold. The ether system is activated by turning the MASTER SWITCH to START and hold-
ing the ETHER switch in the ON position.
1-12-7 Output Supply System.
1-12-7-1 The Output Supply System (FIGURE 1-8) consists of the AC generator, GROUND FAULT CIRCUIT INTER-
RUPTER (GFCI), CONVENIENCE RECEPTACLE, current transformer, AC voltage reconnection terminal board, AC
circuit interrupter relay, load output terminals, AC CIRCUIT INTERRUPTER switch, kilowatt transducer, kilowatt meter
(PERCENT POWER), AM-VM transfer switch, AC voltmeter (VOLTS AC), and ammeter (PERCENT RATED POWER).