ENGINE OVERVIEW AND DIAGRAMS
THIS WORK PACKAGE COVERS:
Engine Overview And Diagrams
The engine is a 12--cyclinder, 90 degree, V--type, air cooled turbosupercharged diesel engine. The engine features
a fuel injection system and a turbosupercharged air induction system which obtains optimum engine performance.
The engine is equipped with a 28 volt, 650 ampere oil cooled alternator (generator) and a 24--volt solenoid acti-
vated starter. The engine is also equipped with two intake manifold heaters and purge pump, time totalizing meter,
fuel/water separator and smoke generating system. A monitoring system indicates engine oil pressure, engine oil
temperature, fuel level and the status of the turbocharger dust detectors. The generator, smoke generating system
and the monitoring systems are each described in separate sections.
The main engine starter system consists of the starter, starter solenoid, a starter low voltage protective module, a
park position switch (neutral safety switch), a START switch, a 20--amp circuit breaker, and related electrical wiring.
Operating voltage (+24 V dc) for the starter is supplied from the batteries through the starter solenoid to the starter
motor. The low voltage protective module prevents starter activation with improperly charged batteries. The low
voltage protective module also shuts the starter off when the engine starts and prevents the starter from engaging
when the engine is running. When the MASTER switch is ON, system power (+24 V dc) is supplied through the
20--amp circuit breaker to the START switch. When the START switch is pressed, system power is applied through
the park position switch to the low voltage protective module which, in turn, energizes the starter solenoid. Battery
power (+24 V dc) is then applied through the solenoid to the starter motor and the engine is cranked. The park
position switch prevents cranking the engine when the transmission shift selector is not in the neutral position.
The main engine manifold preheater and purge pump system consists of an ENGINE PREHEAT ON/OFF switch, a
20--amp circuit breaker, two manifold preheater coils, the preheater spark plugs, two fuel solenoids, a purge sole-
noid, a purge pump, and related electrical wiring.
The main engine manifold preheater and purge pump system provides the capability to start and sustain main en-
gine operation in cold weather conditions. The heaters, when operated, preheat the air entering the cylinders to
facilitate cold weather starting and cold weather idle operation. The purge pump and solenoid allow air to be
purged from the fuel and manifold air induction heater systems in order to fill the systems with fuel. When the
MASTER switch is ON, the manifold preheaters are turned on whenever the ENGINE PREHEAT switch is held in
the ON position. Likewise, the purge pump and purge solenoid are also turned on as long as the ENGINE PRE-
HEAT switch is held in the ON position. When the engine reaches normal operating temperatures, the ENGINE
PREHEAT switch can be set to OFF to shut down manifold preheater and purge operations.
The main engine fuel supply electrical system consists of the electric fuel pump, the fuel shutoff solenoid, the fire
extinguisher fuel line interlock switch, the FUEL PUMP switch, the ENG FUEL SHUT OFF switch, two 15--amp cir-
cuit breakers, the FIRE EXTINGUISHER ENGINE SHUTOFF indicator, and related electrical wiring.
System power (+24 -- 28 V dc) is supplied to the FUEL PUMP switch and ENG FUEL SHUT OFF switch through
separate 15--amp circuit breakers. When the MASTER switch is ON, the fuel pump operates to supply fuel to the
main engine whenever the FUEL PUMP switch is set to ON. If either the FUEL SHUTOFF switch is ON or the fire
extinguisher fuel line interlock switch is activated, the fuel solenoid is energized and fuel is shut off to the engine
injector pump. In addition, the FIRE EXTINGUISHER ENGINE SHUTOFF indicator will light.
The fuel/water separator consists of a control module and solenoid valve. The separator system operates auto-
matically whenever the engine is running to detect and remove water from the fuel system. A time totalizing meter
records elapsed main engine running time. Both the fuel/water separator and the time totalizing meter operate
from the main engine generator output (+28 V dc); thus, these accessories operate whenever the main engine is