TM 9-6115-730-24
0003
ENGINE COOLING SYSTEM - Continued
open position, and all the coolant flows to the radiator and then back to the water pump inlet to provide maximum
heat release. A shunt line extends from the top of the water pump to the surge tank. The shunt line must be
routed properly to avoid trapping any air. By providing a constant flow of coolant to the water pump, the shunt line
prevents cavitation. The cooling fan circulates air through the radiator where the coolant temperature is reduced. In
addition, the fan cools engine and generator set components within the TQG housing by drawing in air from outside
the housing through the baffles, circulating the air through the housing, and forcing the air through the radiator
and out through the housing exhaust vents on the roof. The housing is designed to operate with the doors closed
which ensures that the main alternator and other TQG components have access to a good flow of cooling air from
outside the generator set. The normal operating temperature of the generator set is 170 F to 200 F (77 C to 93
C). A coolant temperature sensor provides automatic shut down in the event that coolant temperature exceeds
230F (110C). The lower GSC display indicates the engine coolant temperature.
Figure 4. Engine Cooling System.
LUBRICATION SYSTEM
The lubrication system (Figure 5) consists of an oil pan, dipstick, pump, oil pressure sensor, and filter. The oil pan
is a reservoir for engine lubricating oil. Engine oil lubricates, cleans, cools, seals, and preserves engine parts. The
dipstick indicates oil level in the oil pan. A pump draws oil from the oil pan and through a screen that blocks large
objects from entering the oil pump and oil cooler. The oil then passes through a spin-on type filter where small
impurities are removed. From the filter, oil enters the engine and is distributed to the engine's internal moving parts
through internal passageways. Oil is also supplied to the turbocharger. After passing through the engine, the oil
returns to the oil pan. The lower GSC display indicates oil pressure sensed by the oil pressure sensor in the
engine. The engine will shut off automatically if the oil pressure drops below 30 psi (207 kPa) and the red LOW
OIL PRESSURE indicator on the GSC will flash. The oil level can be checked with the engine running.
