TM 5-3810-300-24&P-3
7.4.1
SHUT-DOWN SYSTEM
A manually operated emergency engine shut-down
device, mounted in the air inlet housing, enables the
operator to stop the engine in the event an abnormal
condition should arise. If the engine continues to run
after the engine throttle is placed in the NO-FUEL
position, or if combustible liquids or gases are
accidentally introduced into the combustion chamber
causing overspeeding of the engine, the shut-down
device will prevent damage to the engine by cutting off
the air supply and thus stopping the engine. The shut-
down device consists of an air shut-down valve mounted
in the air inlet housing and a suitable operating
mechanism.
The air shut-down valve is retained in the open position
by a latch. A Bowden wire is used to enable the operator
to remotely trip the latch. Pulling the emergency shut-
down knob all the way out, will stop the engine. After the
engine stops, the operator must push the emergency
Fig. 1 - Typical Solenoid Operated and Manual
shut-down knob all the way in and manually reset the air
Emergency Engine Shut-Down Device Mounting
shut-down valve before the engine is started again.
123
Bolt
142 Lever--Valve
An electrically operated emergency shut-down device is
124
Housing--Air Inlet
144 Bowden Wire Assy.
used on certain engines. This device is similar to the
133
Shaft--Valve
147 Screw--Wire Assy.
manual shut-down except that a solenoid, operated by a
139
Lock Plate--Shut-Down
149 Nut--Valve Lever
push button switch, is used to trip the shut-down latch.
140
Bolt--Lock Plate
159 Solenoid--ShutDown
141
Lock Washer
Inspection
when an attempt is made to close the valve. Make sure
Accumulation of dirt behind the steel ball in the detent
the ball detent is clean.
lever may prevent the lever from moving
For disassembly and assembly of the emergency shut-
down valve, refer to Section 3.3.
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