Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1920-10-06

l. How can leak which is so
small that 1t is unnoticeable be found
in u hollow carbureter float?
A leak in hollow carbureter float
which may be 80 small that 1t is
unnoticeable can be located by plac-
ing the float in boiling hot water.
The gusolene within the float will
vaporize under the heat and emerge
from the leak in the float in small
bubbles. When bubbling ceases re-
move the float from the water and
repair the leak.
What is a good way to test the
carbureteP mixture?
I One way of testing the carbureter
mixture is TO shut off the flow of
gasolene to the carbureter. run the
engine and accelerate It's speed The
engine will increase in speed as the
Sasoiene becomes weaker. Then set
the needle valve SO that the cylinders
will get Il smaller amount OF fuel
with each suction stroke OF a piston.
To test for a weak mixture flood the
carbnreter while the engine is In
operation by holding open the inlet
valve. Increased speed indicates not
enough fuel under the present car
bureter adjustment,
3.-What are the two ways of gem
Grating electricity, both of which are
employed in an automobile? h
Electricity is generated both by
chemical and mechanical means in
the modern automobile. 1t is gener-
a n NV hn
acid with the plates in a storage
battery; mechanically by generator
and magnetic.
4.-tIow can you tell If a cylinder
is cracked inside the water jacket?
If cylinder wall is cracked With
in the water jacket air bubbles will
be seen in tho radiator during com
preston strokes of the pictons and
water will appear in the combustion
chambers of cylinders possibly in the
the crankcase. Welding is the best
method of-repairing cracked cylin-
der.
5.-What Is wrong when car
"drags" even when the engine seems
to be operating we'll?
A car dragging while the engine is
operating well may be caused by a
slipping clutch. If the trouble is due
| to q cone clutch with leather facing
| it is caused by lack of tension ri
| springs or presence of Oil on the fric-
ton surfaces. The multiple disc
clutch will slip if it's friction plates
are worn or If the spring is weak or
out of adjustment.
6.-What are causes Of oyerheated
exhaust pipes of muffler?
If the exhaust pipe and muffler
overheats, it is caused by fuel not
fully burned passing thru the ex-
haust valves and into the muffler
where it completes burning. Too rich
a mixture, low gear running for too
long time, late spark or valves
out Of time may be the troubles, al
SO poor spark, clogged exhaust pipe
or muffler and valves which stick or
do not open far enough.
7.-How much wire Is needed to
make the secondary winding of an
ignition coil?
The secondary winding of an iSni-
ton coil requires many thousands of
feet of very fine copper wire, insu-
lated with silk thread wrapped
around It, The wire used is much
finer and more flexible than that
used for the primary circuit, also in
sulated. Both windings are heat and
water proof.
S.-What is the boiling point of al
cohol and gasolene?
Wood alcohol boils at 1853 degrees
fahrenheit, denatured alcohol at Ill
degrees and gasolene at 173 degrees.
Kerosene withstands the heat con-
siderably longer. 1t will not boil un-
til it is heated to 3S7 degrees.
9.-What is the cause of vibration
while an engine is running?
Vibration of the engine while In
operation is caused by parts in mo-
ton being unbalanced or out of true
TO each other. Uneven compression
or combustion in the cylinders, the
former caused by leaking of valves
or piston rings and the latter by the
former causes or a weak spark will
create vibration. Other causes are