Evening star., 1921-06-05
Answer. to Last Week. Questions.

Answers to Last Weeks Questions.
l. The complete overhauliEg OF
car-that is. the taking apart, clean
ing, adjusting and replacing worn
parts of every mechanical unit and
auxiliary in the car-each season.
which was customary in the early
days. is Unnecessary in the modern
car. providing the machine has been
properly fabricated and minor ad-
lustments. made when the need de-
manded them. Rattles or knocks
may develop. but will be discovered
Immediately they occur if weekly
inspection is given by the motorist,
and should be attended to and rem
edied at once; or course. when the
limit OF service. general overhaul
ing may be necessary, although even
then there may be parts in fair con-
dition.
in the water jacket of an engine to
remove scale. If it is allowed to re-
main within the jacket for a time:
but do not allow it to stand in the
radiator. A better and harmless So
luton for radiators is soda dissolved
in water. Flush the system with
this several times to remove rust and
scale and then flush with clean
water.
3. End play in the camshaft or
crankshaft Of an engine will cause
knocking. This trouble may occur
even though the shaft bearings are
tight and in good condition. because.
while there would be no vertical play
in the shafts, there might be hori-
zontal or end play.
planetary transmission can be ad
iusted by removing the door Of the
transmission case and turning to the
right the adjusting nuts on the
shaft. Sometimes the bands may be
worn to such an extent that adjust
ing will not remedy slipping when
replacement is necessary. Do not
allow the bands to drag on their
drums. as heat. wear and hard pull
ing will result.
tightly inserted in an engine. es-
pecially when it is hot. as contrac
tion of the metal when the engine
cools will cause hard removal of the
plug.
6. The transmission creates more
noise when low or second speed
gears are engaged than it does when
the car is travelling in high gear. be-
cause in speeds other than high the
power is transmitted through gear
teeth which are naturally more
noisy. In high speed the transmits
sion is on direct drive. when all other
gears brough into play in lower
speeds are not in mesh. If the trans
mission is of the four-speed type
there must be an extra gear on both
transmission. These gears are in
mesh when the car is in fourth speed.
I. The carburetor mixture is cor
rect if the engine runs without chok-
est possible or the highest possible
speed. or at any speed between these
two extremes. The color. of the ex-
haust flame if exhaust manifold were
removed or petcocks in cylinder head
opened should be a faint blue or
purple.
g. The use of plain tread tire and
a non-skid tire should be avoided. be-
cause the plain-tread is more liable
to skid when brakes are used. when
it's speed quickly. thereby wearing
more rapidly than the non-skid tire.
9. When the car is going down
long hill the use of the engine as
brake saves the brakes themselves.
If the throttle is opened with ignition
fuel, not being burned. serve to cool
the engine during the descent and
add to the braking effect by increas-
ing compression.
too lean burns too slowly and causes
a popping sound in the carburetor.
because the charge within a cylinder
is still burning when the inlet valve
opens to admit another charge of
fuel, thereby igniting the fuel in the
inlet manifold as it is being drawn
from the carburetor to the cylinder.
The result is popping back into the
carburetor, accompanied by the faint
flame sometimes noticed by the mo-
torist.
This Weeks Questions.
+ /, For what reason is the trans
mission gear set used on the auto
mobile?
2. What should be done before the
carburetor is adjusted?
3. What care should be given to the
minor working parts of a car?
i. should oil be used in a hand tire
pump plunger, or in the valve
plunEer? Is there any substitute for
oil at these parts?
5. How is the engine used as
brake to slow the speed OF car, and
what causes the braking action?
6. What is the average in size and
price Of the American automobile?
I. What causes most spring trou-
bles. such as lack of resiliency or
breakage?
8. We're all four wheels Of the early
-@ ~ A GO