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116
:
I
I
k
0
X
Reach is correct
Reach is excessively long
Fig
.
5. 23
Spark plug reach
Fig.
5. 24
Noise suppressor cap
Fig
.
5.
25
Cross-section of noise suppressor
(D
Screw
®
Resistance cap
®
Co ntact ·spring
©
Seald cover
®
Wat
er
proo
f terminal cap
®
Screw
w
eed
<i)
Re sistor
@
Terminal
connector
®
Spring
@)
Naise suppressor
body
cap
@
Terminal seal
@
Spring
X
5.
ELECTRICAL PARTS
i
I
..J
i
_J
The following undesirable condition will develop
if plug of improper reach is used.
(1)
Reach too long
a.
Carbon will be deposited on the exposed
thread of the plug and cause damages to the
threads in
the
spark plug hole during plug re-
moval.
b.
Tip of the sp:::irk plug will
becorr:e over-
heated and cause pre-ignition.
(21
Reach
too short
a.
Ca rbon will be deposited on the threads at
the bottom of the plug hole and whl:'n the
spark plug of the proper reach is installed, the
threads in the plug hole will be damaged.
b.
Due to the cavity left by the short reach,
exhaust gas will accumulate, causing a decrease
in power output, overheating and engine
mal-
function.
The consequence of using improper reach plug
can be detrirr.ental, therefore, make sure that the
specified plugs shall be used (Fig.
5. 23)
5.
Noise Suppressor
The oscillating current which contains the high
frequency
radio wave produced by the high tension
ignition circuit is radiated from the high tension cir-
cuit and the vehicle chassis to cause interference
to the reception of the radio and television sets.
To prevent this undesirable condition, the spark plug
is fitted with a suppressor.
The suppressor consists of a resistor incorporated
within the plug cap and housed in the shield cover.
The resistor functions as a diminishing resistor, the
shield cover increases the high frequency suppressing
characteristics as a combined part of the suppressor.
{Caution)
1.
The suppressor should be handled in the same
manner as the plug cap, however, provide .ade-
quate care to the junction of the high tension
cord and make sure that the cord is fully screwed
in.
2.
If the resistance value should accidentally
change or if the value should become infinate, it
should not effec
f
the performance; {discoloration
of the outer insulated coating) it is recommended,
however, that it be changed with a new item.
3.
Suppressor with missing waterproof caps should
never be used {flashover with consequent malfunc-
tion of the ignition system will result!.
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