TM-9-2320-346-10
TRUCK, COMMON BRIDGE TRANSPORT (CBT), 8X8 M1977A4 W/WINCH AND M1977A4 W/O WINCH
TECHNICAL MANUAL; OPERATOR'S MANUAL
OCTOBER 2008
TM-9-2320-346-10 - Page 144 of 1184
Each cylinder has two inlet valves (9) and two exhaust valves (10) that are mounted in the
cylinder head.
Exhaust gases from the exhaust manifold flow into the high pressure turbocharger's exhaust
inlet (11).
NOTE
•
The hot gases that are expelled from the engine are used to turn the
turbine wheel of the turbocharger.
•
The turbine wheel drives the compressor wheel that is used in order
to compress the inlet air that enters the inlet side of the turbocharger.
The exhaust gas exits from the high pressure turbocharger through the high pressure
turbocharger's exhaust outlet (12).
NOTE
The wastegate also prevents excessive boost of the engine during ac-
celeration.
Wastegate (13) is used by the high pressure turbocharger (5) to prevent an overspeed
condition of the turbocharger turbine wheel during engine acceleration.
The wastegate (13) is controlled by the boost pressure that is felt in the air hose assembly
that connects the inlet side of the two turbochargers.
NOTE
•
As the diaphragm reacts to high boost pressure, a valve is activated.
•
The valve allows exhaust gas to bypass the high pressure
turbocharger's turbine, which effectively controls the speed of the
turbine.
Wastegate pressure line (14) provides the air pressure to the wastegate's diaphragm.
NOTE
•
The exhaust gases drive the turbocharger's turbine.
•
This energy is used in order to compress the inlet air in the same
manner as the high pressure turbocharger.
The exhaust gases then enter the exhaust inlet (15) for the low pressure turbocharger (2).
The exhaust gases then exit the low pressure turbocharger (2) through the exhaust outlet
(16) into the vehicle's exhaust system.
END OF WORK PACKAGE
TM 9-2320-346-10
0013
0013-8
Back to Top
