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M0132847
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Illustration 37
Typical examples
(1) Oil pressure sensor
(2) Coolant temperature sensor/switch
Engine Shutoffs and Engine
Alarms
Shutoffs
Shutoffs and alarms are electrically operated or
mechanically operated. The operation of all electric
shutoffs and alarms utilize components which
actuate switches in a sensing unit.
Shutoffs are set at critical levels for the following
items: operating temperature, operating pressure,
operating level and operating rpm. The particular
shutoff may need to be reset before the engine will
start.
NOTICE
Always determine the cause of the engine shutdown.
Make necessary repairs before attempting to restart
the engine.
(3) Inlet air temperature sensor (if equipped)
(4) Governor actuator
Be familiar with the following items:
i02672017
• Types and locations of shutoff
• Conditions which cause each shutoff to function
• The resetting procedure that is required to restart
the engine
Alarms
Alarms consist of a switch and a contactor. The
switches are wired to the contactors. The contactors
activate alarm circuits in an annunciator panel. Your
engine may be equipped with the following switches:
Engine oil pressure – The engine oil pressure
switch indicates when oil pressure drops below rated
system pressure.
Coolant level – The low coolant level switch
indicates when the coolant level is low.
Coolant temperature – The coolant temperature
switch indicates high jacket water coolant
temperature.
Operation Section
Engine Shutoffs and Engine Alarms
41
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