TM 5-2410-241-23-1
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ENGINE CONTINUED
Vibration Damper
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The force from combustion in the cylinders and from driveline components will cause the crankshaft to twist. This is
called torsional vibration. If the vibration is too great, the crankshaft will be damaged. Driveline components can
excite torsional stress, which could cause damage to components. The vibration damper limits the torsional
vibrations to an acceptable amount in order to prevent damage to the crankshaft.
The viscous vibration damper is installed on the front of the crankshaft and consists of a weight in a case. The
space between the weight and the case is filled with a viscous fluid. The movement of the weight in the case limits
the torsional vibration.
Rear Power Take-Off (RPTO)
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The Rear Power Take-Off (RPTO) is an integral part of the flywheel housing. The RPTO provides continuous live
power through the following direct drive gears:
Crankshaft gear
Idler gear
Output shaft gear
These gears are driven off the rear of the crankshaft.
FUEL SYSTEM
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There are five major components of the Electronic Unit Injector (EUI) fuel system:
Electronic Unit Injectors
Fuel Transfer Pump
Engine Electronic Control Module (ECM)
Sensors
Actuators
The electronic unit injectors produce fuel injection pressures up to 30,000 psi (207,000 kPa) and fire up to 19 times
per second at rated speed.
The fuel transfer pump supplies the injectors by drawing fuel from the tank and by pressurizing the fuel between 60
and 125 psi (414 and 862 kPa).
The engine ECM is a powerful computer, which controls all major engine functions.
Sensors are electronic devices, which monitor engine performance parameters, which include measurement of
pressure, temperature, and speed. This information is sent to the engine ECM via a signal voltage.
Actuators are electronic devices, which use electronic currents from the engine ECM to change engine
performance. An example of an actuator is an injector solenoid.
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