South Bend news-times. (South Bend, Ind.) 1913-1938, 1918-06-30

. too lean a mixture, due 10 cold en-
CINE, spray nozzle too far closed,
auxiliary air valve partly open.
clogged fuel line. or leaky inlet
manifold This is slow-burnine
mixture. which burns all during the
power stroke, the exhaust stroke
and is still burning when the inlet
valve opens, communicating Jse
flame TO the inlet manifold This
gives the popping noise referred 10.
other causes are inlet valve part
/ ~ open (valve sticking i'm guide.
valve litter out OF Adjustment,
short circuit Of timer or distributor
wires, wired up incorrectly. or roter
Of interrupter shiften on shart. Test
I inlet valve by cranking engine ana
noting compression OF that cylinder
See that valve clearance is about
+ COOS inch. Trace out ignition WIZ
1 ing II engine refuses to start ana
there is persistent back-fiiring in
carburetor, it indicates that the
rtoer has shiften on its driv1n9
shaft
Motoring Dept. The News-Tines:
Recently my engine refused TO run
and ] had 10 be towed home. /
removed the magneto. but can get
no spark from it, The breaker
points are clean and separate the
right distance The distributor is
clean and the brushes in good con-
dition. Please tell me where you
think the trouble may be. and if it is
anything ] can fix myself. q. r.
Although not so stated, we as
sumo you have a high tension mag
neto OF the usual type. Inspect safe
| ~ spark gap as that sometlmek
short circuits the magnetic. If that
is all right, the trouble is in the
Windings of the armature. These
/ can only be rewOund by an expert.
using the proper tools. You would
| better ship the magnetic back 10 the
manufacturers and have it properly
overhauled.
Motoring Dept The News-Tmes;
/ Please answer through your Motor
! ing department. if pure graphite
used IL lubricating oil is injurious
/ TO an engine. Answer will be ap-
preciated. r. r.
Pure graphite may be used spar
ingly in the engine Wit hgOOd re-
suits Use only the purest obtain
ed from a reliable manufacturer
and feed il through air inlet OF car
buretor while engine is running ono
teaspoonful once a month is sufii-
cient. Do not mix il with cylinGeT
oil and put i'm crank case. as il
works best when used as above de-
scribed
Motoring Dept. The News Times:
I have a carburetor and would like
some information concerning it.
About where should the gasoline
| level be? The engine smokes when
running idle at low speed, and gets
so full OF gas when the throttle is
| opened that il sometimes stops This
happens on any adjustment that /
make. At times il smokes badly
when pulling and then gets over it.
Why should the two middle Cylin-
ders of this engine run steadily ana
the two end ones fire every three or
| four times? l have gone over eN-
erything / could. set valve tappets
right, have the best kind of gaskets,
and a new magnetic. w d.
/ just below the top of the spray
nozzle Make the float heavy until
constant drip is obtained. Then
make il light until the drip just
stops. Your auxiliary air varv-
sticking would give you too much
! gasoline at speed. Probably one
cam Of the magnetic circuit brea6-
err is worn more than the other,
/ causing Nos. I and cylinders TO
mistire. There may be leakage of
inlet manifold Test with oil while
/ engine runs. While engine is hot
! see if valve filters still have a
slight clearance.
Motring Dept. The News Times:
/ I have a dual ibgnition system on
my car / can start engine by spin
ming on magnetic, but il refuses 10
start on battery However. after
engine is warmed up. I can keep IL
running on battery by working the
started button. but it stops when :
stop. How can / locate the trou-
BILE. and is il anything serious?
T. J..
Tn trouble is i'm the battery cir
cuit-breaker. Remove cover and in
spect carefully 10 see if any parts
are loose Draw a piece of fine en-
/ cry cloth through the breaker
points several times 10 clean them.
See if breaker moves freely. If not.
spring is loose, broken. or a drop
OF oil is needed on pin on which
/ breaker turns. Also test size of gap
| by means OF gauge on the wrench
supplied by the manufacturers II
no gauge il handy piece or met
al. one sixth-fourth Of an inch. may
be used.
Motoring Dept. The News-Times:
What is meant by pre-ignition2
opened my switch recently and the
s.. engine continued 10 run They told
me it was pre-ignition but on one
could explain.
Pre-ignition means isnitiou before
dead center-one OF the causes OF
engine knocking What happened
500 your case was that the carbon in
the cgluder-head or the metal IT.
SELF was red hot Ths fired the
charge and so the engine continued
o. run 10 caused by overheating.
the radiator will steam II bV CIR