ENGINE
plugs. However, the strains of intense
heat, vressure, mechanical shock, elec-
evidence of your carem handling of
the vluas.
A
mcdA
and chemical action, during
miles of service, wreak such havoc on
(k)
The top half of the insulator is often
the electrodes that molecular con-
responsible for causes of poor plug
struction is affected.
Plugs reach a
worn out condition and resetting
can
serve a good purpose only for a time.
Fig.
45
Testing
for
Lcab.
Fig.
44
The
Champion Spark
Plug
Gap
Tool.
When gaps are badly burned, it is
indicative the plug is worn to such
an extent that further use is
un-
warranted and wasteful. When re-
setting, bend the side wire only, never
bend centre electrode as this may split
the insulator tip.
(i)
Inspect for leakage after testing, by
applying oil around the terminal (Fig.
45). Leakage is indicated by the pre-
sence of air bubbles, the intensity of
which
will
serve to show degree of
leakage. Leakage throws the plug out
of its proper heat range, as the hot gas
escaping has a
"
blow torch
"
effect on
the plug, causing compression loss,
pre-ignition, rapid electrode destruc-
tion and overheating of the insulator
tip.
(j)
New gaskets have been fitted to the
plugs and the general improvement in
appearance is apparent now that the
plugs are ready to be installed in the
engine (Fig.
46).
It requires no
imagination
to know that improved
performance (Fig.
47),
namely, paint
splashes, accumulation of grime and
dust; cracked insulators caused by
slipping spanner, or overtightening of
terminals. Examine for cracked in-
sulators at shoulder and terminal post.
Remove grime and dust. Recommend
inspection, cleaning and testing every
3,000
miles (Fig. 48).
Clean and replace sparking plugs
periodically as necessary. The correct
gap for the
TR2 plugs should provide
engine perfonnanceY better petrol
con-
Fig.
46
Sparking
Plugs
ready
to fit to
Engine.
sumption and satisfaction
will
result.
Note the New Gaskets
and
the
use
of the
The use of the stand (as illustrated) is
Stand.
40
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