TM 5-3805-298-23-1
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AIR INLET AND EXHAUST SYSTEM
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Air Cleaner Assembly
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Intake air is drawn through a precleaner assembly which prevents large particles of dirt and debris from entering
the air cleaner assembly. Inlet air then flows through the air cleaner assembly which prevents fine particles of dirt
and debris from entering into the turbocharger inlet.
Turbocharger
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The turbocharger mounts on the exhaust manifold outlet. The turbocharger uses energy from exhaust gas to
compress inlet air to a higher pressure. Compressing inlet air forces more air into the cylinders. Increased airflow
into the cylinders allows fuel to burn with greater efficiency producing more power. A wastegate controls the speed
and pressure of the turbocharger to provide optimum efficiency. The wastegate is controlled by the engine ECM
and is not adjustable.
Aftercooler
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The aftercooler is an air-to-air cooler mounted with the engine radiator in the cooling pack. The aftercooler receives
very hot compressed air from the turbocharger. It is cooled as the hydraulic cooling fan, mounted on the rear of the
machine, pulls ambient temperature air through the aftercooler core, dissipating heat as the air flows across the
fins of the aftercooler toward the engine intake.
Exhaust System
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Exhaust gas exits the cylinder head into the exhaust manifold, and is routed through the turbocharger and into the
muffler and exhaust pipe assembly.
LUBRICATION SYSTEM
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Oil Pan
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The oil pan acts as a reservoir for the lubrication system. The oil pan collects oil returning from various passages
inside the engine and return lines outside the engine to provide a supply of oil to the oil pump.
Oil Pump
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The oil pump is a gear driven pump, which is mounted at the bottom of the engine inside the oil pan. The oil pump
receives oil from a suction line, which runs from the bottom of the oil pan to the oil pump. Oil flows from the oil
pump to the engine oil cooler.
Engine Oil Cooler
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The engine oil cooler receives oil from the oil pump. The engine oil cooler mounts to the left-hand side of the
engine and is a fluid-to-fluid type cooler. Cooling occurs as heat transfers from the oil flowing through the engine oil
cooler to the engine coolant flowing past the cooling tubes. Oil flows from the engine oil cooler to the engine oil fil-
ter.
Engine Oil Filter
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The engine oil filter receives oil from the engine oil cooler. The engine oil filter removes impurities in the oil, which
may damage critical engine components. Oil flows from the engine oil filter to the cylinder block.
Turbocharger Oil Lines
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The turbocharger receives oil from the cylinder block by a turbocharger supply line. Oil flows through the turbo-
charger and returns to the oil pan via the turbocharger return line.
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