TM 5-3895-382-24
The coolant exits the cylinder head at the front. The coolant
then flows into the housing of the water temperature regulator.
If the water temperature regulator is closed, the coolant goes
directly through a bypass to the inlet side of the water pump. If
the water temperature regulator is open, the bypass is closed
and the coolant flows to the top of the radiator.
Electrical System
SMCS Code: 1400; 1550; 1900
The electrical system is a negative ground system.
The charging circuit operates when the engine is running. The
alternator in the charging circuit produces direct current for the
electrical system.
Starting Motor
Illustration 21
Starting Motor
(1)
Terminal for connection of the battery cable
(2)
Terminal for connection of the ignition switch
The starting motor turns the engine flywheel. The rpm must be
high enough in order to initiate a sustained operation of the fuel
ignition in the cylinders.
The starting motor has a solenoid. When the ignition switch is
activated, voltage from the electrical system will cause the
solenoid to move the pinion toward the flywheel ring gear of
the engine. The electrical contacts in the solenoid close the
circuit between the battery and the starting motor barely before
the pinion engages the ring gear. This causes the starting
motor to rotate. This type of activation is called a positive shift.
When the engine begins to run, the overrunning clutch of the
pinion drive prevents damage to the armature. Damage to the
armature is caused by excessive speeds. The clutch prevents
damage by stopping the mechanical connection. However, the
pinion will stay meshed with the ring gear until the ignition
switch is released. A spring in the overrunning clutch returns
the clutch to the rest position.
Alternator
Illustration 22
Alternator
(1)
Shaft for mounting the pulley
The alternator produces the following electrical output:
three-phase
full-wave
rectified
The alternator has brushes. The alternator is an electro-
mechanical component. The alternator is driven by a belt from
the fan drive pulley. The alternator charges the storage battery
during the engine operation.
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