Tulsa daily world. [volume] (Tulsa, Indian Territory [Okla.]) 1905-1919, 1917-11-18
LESSON NO. 81.
Inss nT Ibpxxsr


OF the "rhree Essentials" compress
sion. mixture and ignition. which must
be perfect In order 10 have the engine
run perfectly, the first two: compress
sion and mixture. are responsible for
the power of the engine. II the COM
preston is weak, the power will he
little. while II the mixture Is not right,
there also viii be little power.
A. loss OF power IS not only the
cause of annoyance when driving, hut
means loss of mileage per gallon or
gasoline, and therefore loss OF. money,
IL will more than pay to spend little
money. or time and labor. In order TO
keep the engine as powerful as pos
sihlc.
II the loss of power Is due to the
mixture. then in four out OF five cases
the remedy is TO rcadjust the car
buretor For the inexperienced II
woull probably bo pest to drive tho
cur 20 the service station OF tn" maker
of either the car OF carburctor, and
have u adjusted there.
AS there are go many makes OF car
buretors on the market and as each
maker has two or more models, no do
tailed instruction In carburetor adjust
nient can he given. For those who
wish TO adjust their own carburctor
10 the following advice and method is
given;
Never attempt to adjust cnrhu-
rotor, unless the engine has beer
thoroughly warmed up Know youi
carburctor, how 1t works and the rca'
son for and purpose Of every scrcw
A postal to tho Carhurotor maker
will bring YOU an instruction sheet
showing the operation of the CaIbu.
rotor, and an explanation OF each
part, and pointers on how to tell
when the mixture is too rich or toe
lean, and how TO make the neces-
sary correction,
To adjust carhurctor having n
high speed and low speed adjust
msnt. the first thing to do IL to hc
sure that the ignition and compress
sion Is o. X, that there Is no leak,
axe OF extra air. either between the
manifold and carhuretor or tho
manifold and cylinders After warm
ins up the engine. tho spark is then
retarded and the low speed adjust
ment screw slowly turned one notch
AZ a time ~ aS ~ make the mixture
weaker until the engine stops or
there * a popping In the c1rburetor
or -isre - a very decided slowing
down 1f the engine. rhsr ths Screw
luci rfs engine ru-s smoothly ard
Ia, srp-,isi I1. 0ra % -h-ss nctchss
shuuIi be- enough ~ -he Rta- cdse.
ouce -le low speed = Rtr-s-ed i-
IS noe -rurhst whrr -rRS.~< - htgh
Speed ne ,Iscr-sr- = r,8Sc -hls at-
-uS-msrr -he SpHrS = A3s0~cet Snd
the -hrcytle opened t2i-'y cu.cSly Rnt
Immediately closed again u there
: no popping In the cNrNurctor, the
hish speed adjustment Scrcw Is turned
ouS notch 10 weaker, and the throttle
agoin opened. and adjustment Rgain
turned down one notch As soon rs
thcrc is popplng the htgh speed
mixture ~ made richcr one notch. OF
unlil the popping stops and the engine
Rccclcratos quickly, or us the saying IT,
mas good yet away"
Mixture troubles are not always
duo To tho adjustment Tho rppolln,
may focd too slowly, perhaps hccRus,
ot Ru obstruction ln the fccd pipe. ol
float valve, nr to the loNol OF tho gnao
line In tho float chamber hcng to,
huh or too low, because W fault n
the floW, its mechanism or valve.
Loss ,r power is more nftcn due :,
loSs Of com preston than Co Ruyth'n,
clsc, anG loss of compression Is mostl,
due To loaklug valves. though there
may also hc leakage at or through
the spark plugs, NJ tho valve cans. n
tho compression cocks. or past IN,
piston rings
Pouring oil around tho base " IN,
spark pmG tho compression cocks o
the valve caps, will show II there 4
leakage past them, nS if thcrc is. ia,