ENGINE
a gap of .032", the Champion LlOS
4"
reach plug being specified for normal
road work, the LllS for high speed
work. The normal efficient life of a
sparking plug is 10,000 miles, after
which, if full efficiency and economy is
desired, the plugs should be replaced
by new ones of the type specified.
Fig.
47
sparking Plugs in various conditions.
The distributor cap and rotor should
be periodically examined for cracks
which will allow electrical leakages.
The contact breaker points should be
examined each
5,000
miles, when
normal lubrication of this part of the
car is recommended, and where these
have become burnt or pitted, they
should,
if
possible, be squared up with
a piece of carborundum stone, so that
when the points are closed they
fit
flush against each other. If the points
have become seriously worn they
should be replaced by new items. The
points should be properly set
to
pro-
vide a gap of ,014'' to
.016"
when fully
open.
Fig.
48
An unretouched photograph of a
CHAMPION
Sparking Plug after
t
j,ooO
miles of service, compared with a new
plug. The weak spark given by the former
can readily be imagined and amply justi-
fies our recommendation that to save
petrol, plugs should be changed before
such a stage of wear, as that shown in the
photograph is reached.
The condenser wiring and the low and
high tension circuits should be en-
sured, as should the automatic advance
and retard mechanism. Sirmlarly the
coil should be ensured.
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