DETROIT DIESEL
Engine Equipment
ENGINE PROTECTIVE SYSTEMS
MANUAL SHUT-DOWN SYSTEM
The manually operated emergency engine shut-down
The shut-down device consists of an air shut-off valve
device, mounted in the air inlet housing, is used to
mounted in the air inlet housing which is retained in
stop the engine in the event an abnormal condition
the open position by a latch. A cable assembly is used
should arise. If the engine continues to run after the
to remotely trip the latch. Pulling the emergency shut-
engine throttle is placed in the no-fuel position, or if
down knob all the way out will stop the engine. After
combustible liquids or gases are accidentally intro-
the engine stops, the emergency shut-down knob must
duced into the combustion chamber causing over-
be pushed all the way in and the air shut-off valve
speeding of the engine, the shut-down device will
manually reset before the engine can be started again.
prevent damage to the engine by cutting off the air
supply and thus stopping the engine.
AUTOMATIC MECHANICAL SHUT-DOWN SYSTEM
The automatic mechanical shut-down system illus-
manifold outlet. The power element of the tempera-
trated in Fig. 2 is designed to stop the engine if there
ture-sensing valve is placed against one end of the
is a loss of oil pressure, loss of engine coolant,
copper plug, and the other end of the plug extends
overheating of the engine coolant, or overspeeding of
into the exhaust manifold. Engine coolant is directed
the engine. Engine oil pressure is utilized to activate
through the adaptor and passes over the power
the components of the system.
element of the valve. Engine oil, under pressure, is
directed through a restricted fitting to the temperature-
A coolant temperature-sensing valve and an adaptor
sensing valve and to an oil pressure actuated bellows
and copper plug assembly are mounted on the exhaust
located on the air inlet housing.
Fig. 2 - Mechanical Shut-Down System Schematically Illustrated
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