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Condenser
In
a household electrical circuit.
i
f the circuit breaker
is
opened. sparks will be noticed
across the poin
t
s.
Similarly,
when the
breaker points
are
opened.
sparks
are
produced
in
most
cases.
This prevents the sudden
collapes
of
the
primar
y
circuit
and thereby
reduce~
the
high
voltage
reQuired for
the
secondary coil and
fur
ther
causes
sparking
across
the
point
which eventually
resul
ts
in burning or pitting of
th
e
breaker points.
The
con.
denser is
installed
in
parallel across the breaker poin
t
s
to
pre
vent this undesirable
condition.
Condenser can
be
considered
as a device to store
electr
i
:i
ly.
I
t
is
made from shee
t
s of
mica
or
paraffin
paper
and
tin
foil in
al
te
r
nate
layer. (Fig
.
3
32)
Spark Plug
The spark plug
plays
the
role
of
igniting the com-
pressed air-fuel
mixture
within the
cylinder.
The spark
p'ug
is
securely sc·ewed
in
to
t
he cylinde
r
head with a
gaskel
installed.
It
is
exposed
to
high
voltage. high
compression and high
temperature·
hence,
high
streng th,
heat
resistance
and
r eliabili
ty
are essential.
At
the
end of
the
plug
are
located
the
center
elec trode
and
the g
rounded
side elec
t
rode
with clear
-
ance
of
0 .6-0.7
mm
(0
.024-0.028
in)
between the
electrodes.
If the spark
plug
clearance or gap
is too
wide.
re.
sistance
to th
e
high
vol
ta~e
to bridge the
gap
is
increased
and
pr
events
the spark from being
produ-
ced: it the plug
gap
is too narrow
,
a
short
is
likely
to
occur due to
ca
r
bon
deposi ts.
and
in
whi
ch case, a
misfire wi ll
resul
t.
There
fore. the plug
gap should
be
maintained at
the
specified clearance
and the
electrode
surfaces always
be
kept
clean.
The high
vol
tage pro-
duced by the
Igni
t
ion
coil
is rece
ived by t he spark plug
and
causes
a
hot spark to
jump
across from
t
he center
electrode
to the side
electrode
and ignites t he con
-
bustible
mixture
within
the
engine
combustion
chamber.
d::::::.-----==- --==--=--=--
---=-
==--::_-_-;_-
-
--====-==
Fig.
3·32
Construction of condenser
!
)
Mica
4
Tin
foil
@
.
@
r
®
23
_
-
---~:
0 .6-0.7mm
(0
.024-0
.028
in
)
Fig.
3
-33
Construction
of
spark
p
lug
1
T erminal
2
I
nsulator
13
Filler powder
4
Wire
packi
ng
5
Center electrode
§)
Wrenching surface
(
hex)
]
'
Gasket
s'
Main
body
9 Elec
tr ode
}9
Spark
ga
p
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