El Paso herald. (El Paso, Tex.) 1901-1931, 1917-12-08


~AHBCE1IIJN troubles may be
generally segregated into three
~ groups: Those caused 10y the
! fuel. by the fuel feed and by the
carbureter itself A carbureter is
simply a mixing device in which
| sprayed or atomized gasoline IS
mixed with air TO form an explosive
mixture. II this mixture Of gasoline
/ is not properly proportional. its ex-
plosive characteristics viii be poor
{ and trouble viii follow. In general
! IL may be said that = carbureter VIII
I handle mixtures ranging from
! 8 to 1 TO IA TO 7. which means that
I IA parts OF air viii be present Below
I and above those ratios, the mixture
+ is so poor that the engine viii run
I badly or may even fail TO fire at all
: Misfiring because Of incorrect car
{ buretiOn, giving poor mixture, may
/ usually be adjusted simply by IN
0 creasiug or decreasing air or the gas
/ Oline. Assuming that mlsfIrlug IS
I occurring, that the engine IS sput-
terinE, perhaps backfirinE and that
the ignition is known TO be function
I ing properly The first step is 10
move either the gas or the air adj
Justment IN either direction. Try the
air adjustment and move 1t so that
f q .
admitted II the condition gets worse,
If the engine shows further signs Of
/ being in trouble, then the control is
being moved in the wrong direction.
II takes but a minutes experimenting
10 ascertain which element ia the
fuel is needed and soon the engine
should be running smoothly Some
times the range Of adjustment Is such
that compensation cannot be made
for air leaks around the inlet mani-
n HaHH g
adjusting the air or the gas control
in both directions, does not remedy
the engines trouble the cause may
be a stuck fuel valve, q dirty fuel
valve, q leaky float, or a worn or
dirty needle valve.
Sometimes adjustments made while
the engine is idllng gives good results
at the time, but as soon as the power
plant is required 90 pull hard. the
mlsfIring starts again This may call
FOR fresh adjustment In non-adjust-
able Carbureters conditions OF this
kind are brought about by outside
conditions In carbureters with
high and low speed adjustment, the
high speed control should be adjusted
while the engine IS running fast,
though the car is not MOVING. All
carbureter adjustments should be
made while the engine IS hot The
best carbureter adjustment is that in
~ hich the engine operates as 1asr as
NA1aAAAE NaA a. wen --4A AAAAU eEAAAA4E
Thus with the throttle say one-fiftn
open adjust the Carbureter until the
engine reaches maximum speed with
out further movement OF the throttle.
in cold weather there IS inevitably
need for q rich mixture for starting.
because only in the rich mixture is
there sufficient fuel OF high volatility
TO get an explosion The condition
that causes carburetiOn trouble in
cold weather is the heaviuess Of the
nH HH D. Of h. HrnH nn.
10 lift it into the cylinders in appre-
cable quantity. II is for this reason
that the driver shuts off all air when
starting and perhaps primes the
cylinders directly from a can After
the engine has started firing, the
choker should be left on only long
enough 20 get the engine running
smoothly, when il should be opened I
gradually Car owners living in cold /
climates should all employ heated air I
devices Tor supplying warmed air 10 I
the carbureter. II the air inlet has /.
no control for Ehutting out cold air, j
something Of the sort should be in q
stalled so that air from around the 4
exhaust pipe or manifold is used.
Carbureter troubles are likely to I
effect any cylinder: that Is TO say no I
particular cylinder viii nisfirs TO the 4
exclusion OF the others. This makes ]
carburetiOn trouble easy 10 distin- /
guish from ignition trouble. In pres
sure LcE4 81 STEMS 100 AALLle or 700 &
much pressure produces Uisfiriug. In
vacuum feed systems. a stuck float or
& punctured float viii cause the same
trouble. DISTINCTIONS in the fuel line
reduce the quantity of gas reaching
the carbureter, the float bowl does
not iii, with the Inevitable result
To obviate this trouble car owners
should be particular about removing
the strainer at intervals TO remove
accommodations OF foreign matter.
Condensation in the inlet manifold
Is troublesome particularly In en-
gines with long. unheated manifOlds.
which by the way are not commonly
built today. The fuel mixture strikes
the manifold and condenses before IL
can reach the cylinders. When the
engine is stopped, an accumulation
irips out and the owner sometimes I
lureter is leaking. Sometimes, too.
is caused by the cover OF
he float bowl being loose.
When carburetion trouble occurs. I
he car owner should always start at
nethOdicalIy 70 the other end: the
place TO start IS the main tank II
here is fuel IN the tank, proceed to
he next part OF the line, the vacuum
ank or the carbureter. In the former
lpen the drain, IN the latter pull up
he float control II the fuel flows.
here is no actual stoppaEe and the
.ngine may be started and expert
nent along the lines suggested viii 7
ocate the trouble.
PRACTICAL PARAGRAPHS,
ipeedOmeter Failings- \