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5. 5
ELECTRIC STARTER
135
b.
This closes the
starter
circuit and allows
heavy current to flow to
the
starter.
As
long
as the starter
switch
is held closed, the
starter
solenoid will re:1'.ain energized and the heavy
current
will
cont inue to flow from the
battery
to the starter.
2.
Malfunction
a.
When
the starter switch
is
depressed
a
" click "
in
the
starter soleno id
is heard
;
this
indicates
the rr.oven-;ent
of
the plunger and
closing of the terminal contacts
.
b.
If the starter does not operate even the
starter solenoid is energized,
it is probable
that the starter circuit terminal contacts are
burnt and prevent ing the flow
of
battery cur-
rent to the
starter
.
In
such
a case, disassemble
the
starter
solenoid and clean
the contact
areas
with
file
or sandpaper
so that good
contact is being made.
When
the points are not
burnt
but covered
with
oil film
or
moisture, check the condition
of
the
O
ring and if
damaged,
replace with
a new part.
c.
When the starter solenoid is not energizing,
check for the following
conditions.
al
Starter switch defective
bl
Defective
solenoid
coil
cl
Plunger binding
dl
Defective wiring
5. 6
Safety Device
s
A.
Horn
There
are three different types of horn in. common
use.
They are the flat,
spiral and
the
trumpet
types.
The spiral type horn is used on the 450.
(Fig.
5. 69)
O
perating principle and construction of
the
horn.
{Fig.
5.
70)
I 11
Curling horn
Amplification and
radiation
(
:2
l
Diaphragm
Vibrating plate (to produce
sound)
( 3)
Pole B
Connector between arma-
ture and
vibra
ting
diaphragm
(
4)
Armature
Core
(source
of vibration)
( 5)
Pole A
Core
( 6)
Case
Case for
housing
the
com-
ponent
parts
I
____
J
Fig.
5.
68
Solenoid
disassembly
(when
the
cover is opened)
Fig.
5. 69
Horn
h
1f
Fig.
5.
70
Construction of
horn
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