TM 5-3895-383-24
Fuel Shutoff Solenoid Wiring Diagram
Air Inlet And Exhaust System
Air System Components (Non-Aftercooled Engine Shown)
(1) Inlet manifold cover. (2) Hose. (3) Inlet manifold. (4)
Exhaust manifold. (5) Turbocharger.
The components of the air inlet and exhaust system control the
quality and amount of air available for combustion. The
components include turbocharger (5), inlet manifold (3) and
exhaust manifold (4). The inlet manifold is a one piece casting
that also serves as a base for the valve cover. Mounted to the
inlet manifold is cover (1) on non-aftercooled engines or an
aftercooler on aftercooled engines.
Air Inlet And Exhaust System Schematic
(2) Hose. (3) Inlet manifold. (4) Exhaust manifold. (6)
Aftercooler (on aftercooled engines only). (7) Air inlet to
turbocharger. (8) Turbocharger compressor wheel. (9)
Turbocharger turbine wheel. (10) Exhaust outlet.
Clean air from the air cleaner is pulled into turbocharger inlet
(7) by compressor wheel (8). The rotation of the compressor
wheel compresses the air and forces it through hose (2) to inlet
manifold cover (1) on non-aftercooled engines or to air-to-air
(ATAAC), jacketwater (JWAC), or separate circuit (SCAC)
aftercooler (6) using an outside source for water such as sea
water. Aftercooling lowers the temperature of the compressed
air before it goes into the inlet manifold. The compressed air
flows through the inlet manifold to fill the inlet chambers in the
cylinder head. Air flow from the inlet chambers into the
cylinders is controlled by the intake valves.
Aftercooling of the hot turbocharged air cools the air and
increases its density to provide more oxygen for combustion
before entering the inlet manifold.
The air-to-air aftercooler (ATAAC) incorporates a separate air-
to-air core that is installed in front of, or beside the engine
radiator core. Ambient temperature air is moved across the
core by the engine fan and cools the hot turbocharged air.
The jacketwater aftercooler (JWAC) uses engine coolant from
the water pump to cool the hot turbocharged air in a water-to-
air core.
A separate circuit aftercooler (SCAC) system uses cool water
from another source (not engine coolant), such as sea water,
to cool the hot turbocharged air in a water-to-air core.
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