Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1918-03-31
.s|MPL|F|ED LESSONS IN
CARE OF AUTOMOBILES
Eucrrlich Describes Difference in
Operation OF Marvel From
Other CarburctorS.
MAKERS ADJUSTING METHOD
An Intimate Talk by An Expert on
Working Units OF Motor Vehicle
Language Readily Understood by
the Layman.
AUTO LESSON no. ~.

many trucks, differs In It's adjust
incnt Tom most other carburetors In
mat low speed adjustment Is made
on tho air. while the high speed ad-
jNs,ment is mada directly on gasoline
spray nozzle.
The illustration shows a cross sec
ZION OF the carburctor. When the en-
Sinc Is running alowly. gasoline vii!
be sprayed out OF the nozzle g, and
at The same time some air Will enter.
a5 shown by the arrow g. and mix
WIN this gas. While this is happen
ing. the suction of the engine will
tend 10 pull open the shutter l.. which
opening Is resisted by the gprinE ~.
should the mixture of the nozzle G and
air q be too rich. by turning back
on tho screw y the shutter Will
be allowed 10 open slightly and so
aHow more air to enter the mixing
chamber.
a, high speeds the shutter L will
Nc quite far open. and SO there viii
CO h suction on the high speed noZ-
1is d also. from which a spray will
now ISSUE and be carried 20 the mix
Ing chamber with the auxiliary air
enter ring past the 8huttcr.
Iou VIII observe that tho carbur-
etor has two adjustments. the amount
OF air by means OF tho screw u and
the amount of gas By means OF the
screw A
| Eive below tho method Of adjust
Ing as given by the makers
CARE SHOULD he TAKEN
TO SEE THERE ARE 40 LEAKS
Tho carburetor, II fed by gravity.
mould DO so placed that bottom Of
BOWL Ia at least eight inches below
bottom OF gasoline tank. II fed by
pressure, one pound is sufficient and
should never exceed two pounds.
geo that all connections between In
taKo valve of motor and carburctor
"a hE lar nj
cylinders should hold compression as
nearly alike as possible and the igni-
t'on system should bc giving a good
hot spark at each plug, and plugs
mould be clean. with points set evenly
,nd IN most cases a, twenty-five to
thirty thousandttIs.
Notice gasoline needle valve "a"
IN cut: after closing By gently turn
ne to the right until seated. open by
uTn!nS TO LEFT. three fourths to one
urn. Packing nat around needle
mould DO tight enough 10 hold needle
hrmly 10 place.
Notice air adjusting screw "E" on
eu'; this should be SO adjusted tina.
md OF screw is about even with end
II ratch -set-spring.
me preliminary adjustments OF the
arhuretor just mentioned may be
made before attaching.
Notice chokcr for starting in the mir
''"''' c' Ca HHE'NOE. ms should be
FranScd 10 permit OF closing com
P'ete!y mot rartiall!D. IN order 20
ause motor 10 draw off gas for easy
tarting.
should motor hesitate OF pop back.
II starting. pulling out the choker
luton VIII cause carbure,or to give
p excess fuel which VIII aid motor in
aiming UP. and the car should be
r!ven with chokcr partially closed
ntil motor has thoroughly warmed IN.
starting on batteries have spark
e'arded II starting on magnetic. have
PARK advanced one half open throt-
nearly onc-four;h OF the way. Start
ne motor, and upon its running mar
ally release choker. otherwise motor
III! prooab!y load up with gas and
top
After motor has started close throttle
moderate speed. which means nearly
iosed' AZ this point close gasoline
eedie a very little at a time unit,
rotor runs smoothly. allowing motor
run until thoroughly warmed UP be-
ore making final adjustments.
the next step Is 10 get proper ad-
lstment OF air valve TO accomplish
his. air valve adjusting screw .R"
hould be turned 10 the left 10 bacl;
VI and release the air spring. abou,
ne-eighth OF turn at a time until
rotor begins to slow down This in
icates that air valve spring Is now q
tile too loose. whereuron /. should
gain be frightened 4 little BY turning
the right. one eighth OF a turn at
time. until motor runs smoothly
ext advance spark two-thirds OF its
nitro travel. Now open throttle
uick!y and as far as possible. uDon
ding this the motor should speed m
romptly and quickly II il hesitatcs
h"Nnin" N7"k is N"3~'' ,''',e
iore gas should be released at needl.
awe y -. earning ~, M. lee. =,
cry ittle at time. and it may also
necessary TO tighten the air scrnw
little more, but this should not he
one unless absolutely needed. wait
" motor 20 settle and again Omen
,rotte quickly as before Repeat
rese trials until the proper adjust
ient Is obtained. The object being
have just enough gas and not any
Iore TO allow the motor TO pick up
romptly and smoothly when throttle
suddenly opened; the spark. as men
oned before, being at about two
iirds OF its advance or travel
ow HIGHEST ECONOMY
OF FUEI. IS SECURED
The highest economy Of fuel will be
>taincd by adjusting with the air
rev "B' released Uo the lcfD and
re gas valve "A" closed Ito tho rish)
nearly as possible, To obtain the
,sircd results.
For commercial car purposes the
IL model l. truck carburetors are
aGe NEEDLE proof by limiting the
ngc of adjustment "A" on the gas
.edle and adjustment "B" on the air
rev. The limits are so set that
rburctor cannot be put out of run
ng adjustment. yet sufficient range is
ven 10 take care of varying grades
fuel, making perfect setting pos
ole with any grade Of fuel, and max
e at the same time carburetor
al cannot be tempered with by an un-
formed operator. General instruc-
ms for adjustment given above fol-
". except that range of "a" and "B"
limited IS stated.
The set screws on side of carburetor
rs stops for the throttle lever. II
Jtor runs too fast when dlinE back
set screw which acts as stop. If
10 slow, turn set screw in opposite
lection. which will hold the throttle
Oh Il little wider. II set screw does
hold firmly in place tan slot to