f
As the distributor cover carries the electrodes for the four cylinders, it
will be realised that it is imperative the rotating arm can pass th'; spark to the
correct sparking plug lead when compression is reached by each piston,
Finally tighten the adjusting screw, refit the distributor cover and test
the car on the road, If the ignition seems too far advanced or retarded it
can be readjusted at the distributor. There is a considerable amount of
latitude for adjustment but only extremely small movement should be
made at one time.
If the leads from the distributor to the sparking plugs have been dis-
connected they must be replaced in ihe firing sequence marked on the
cover, I, 3, 4, 2.
The
MAGAZINE
contains many useful hints designed to help the owner driver to
do those "little attentions" that mean so much toward getting
the best .from his car.
Also there are detailed descriptions of the bigger jobs that can be
tackled at home, explained in" simple language, and properly
illustrated.
E
There are special features, interesting stories by popular writers, .
travel and sports articles, and "motoring miscellanea:'
"
Your Newsagent will deliver the Magazine to you for
4d, a month.
32
"
1
I'
~,
.
".
"'"
THE SPARKING PLUGS
T
HE sparking plugs with which the Seven is now f!tted ~re K.L.G.
"Corundite" type F.50x.
The gaps of these plugs should be maintained between .022-in.
and .025-in. 'If the gap is allowed to become too wide, misfiring at high
speeds is liable to occur, and if too small, bad slow running and idling will
be the results.
To give the maximum strength this type of plug is non-detachable,
but when it is necessary to clean ihem after a few thousand miles' service,
it is a simple matter to take them to a good garage and have them cleaned
on a sandblasting machine. This will have the effect of removing the
unbumt particles which adhere to the internal insulation, as well a. any
soot or oil which may have accumulated during use, and the resultant good
running will amply repay the cost of this quick and simple operation.
"
When putting them backinto the cylinders, make sure that the sparking
plug washer is not defective in any way, and if it looks flat and worn,
fit a new one so that you can be sure of obtaining a gas-tight joint.
When fitting be careful not to knock the top insulation of the plug,
for although it has a strength which is much greater than the ceramic
material usually used for the sparking
plug insulation, a heavy knock might
fracture the insulation and misfiring
will occur.
Always remember that cheap oil
and petrol, improper carburetter ad-
justment and excessive use of the
choke will have the effed of causing
the internal insulation to become foul
and dirty, and also if the high tension
leads are old and the rubber has be-
come hard and cracked, electrical
leakage may occur, with the result that
the plugs will misfire. If the dis.
tributor points are out of adjustment
fouling of the plugs is very liable to
happen.
If you wish to obtain the maxi-
mum efficiency from your engine and
also maintain the good petrol con-
sumption which your car had when it
was new, change your plugs every
10,000 miles, for old plugs are waste-
ful and give bad and sluggish running.
33
The .. K.L G." Corundit.
F.50.X. Plug.
J
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