The Washington herald., 1922-01-08
Motor Problems
Solved by Cooley,
Motor Authority

| Dife and us equipment Will be
answered. Questions should be
sent to Mr.. f. II. Cooley. vice
president and director of educa-
tion. American Motor Schools,
162i-i622' U street northwest
They will be answered in this
column Sunday following their
receipt. l
Personal attention will be
gladly extended to patrons OF
this column in the event that ex-
plantations here are not thor
oughiy understood. Call at the
American Motor School.
Q. How is the starting motor
connected to the engine and does II
run all the while the engine runs?
A. There are several methods OF
connecting starter to engine, the
most prominent of which Is the
Bendix principal. In this type there
is threaded extension of the start
er armature shaft on which there
rides a pinion which can freely fol-
low the threads on the shaft When
starting pedal is pressed the arpa-
ture rapidly turns over and the
pinion, due to its inertia. tends to
lag and therefore rides the threads
of the extension. As II approaches
the end 1t engages the teeth on fly
wheel. Immediately reaches the end
of the shaft and engages a collar
which makes il revolve as though
integral with the motor armature.
When the engine is turning due to
its own power the fly wheel. re-
volving more rapidly than the mo-
tor pinion. turns the pinion along
the threaded shaft in the opposite
direction thereby disengaging same
which allows the motor to be at
rest 1T all times except during
crank'ng operation magnetic
type has the pinion drawn into the
fly wheel through the principal of
solenoid. mechanical type has
an extension on the starting pedal
which moves an intermediate gear
between flywheel and starting mo-
tor pinion just as the electrical con-
tact is closed.
Q. What Is an overrunning clutch
and what is its purpose?
A. An overrunning clutch connect
ing two shafts allows individual
revolving motion on its driven end
so long as 1t is more rapid than
that of its driving end. This type
clutch is used a lot on Delco in
stallations. An overrunning clutch
connects the motor generator with
the pump shaft. When the motor
is crankng the engine the clutch
allows the armature to revolve in
dependent Of the pump shaft. When
the engine is started the clutch
makes lit possible for the pump
Shaft to drive the same armature.
%. What would cause brakes to
heat to such a degree as to make
them smoke?
A. Excessive friction. This NAV
be due to their maximum use on a
long hill, but more usually is
caused BY improper adjustment.
Q. What are the District regula
tions regarding mirrors?
a. Regulation as to Mirrors
Paragraph p, Section Is. No driver
shall operate any vehicle so loaded
or equipped as to obscure the view
of the drivers rear, unless there is
placed on said vehicle a mirror so
afhxed as to show the highway in
the rear.
This applies to light delivery
autos, trucks. etc. where drivers
view is obstructed directly to his
rear). ''
Q. What is meant by a sand blis-
ter and what causes them?
a. If stone bruise or other cut
penetrating the tread is neglected
SAND or gravel is very apt to work
INTO the tire as 1t revolves and this
material soon accumulates between
inc tread and fabric or between the
layers or the fabric until it forms q
protuberance of some size. This is
called a sand blister.
~. what are the District recula-
tons regarding the overtakinE of
street cars?
a. Sec. II. No vehicle shall mas.
or approach within fifteen feet of
any street car while the Same is
stopping or stopped for the purpose
OF taking on or letting off a pas
senger, nor within such distance OF
the place where a passenger shall
nave left said car until the pas
senger shall have reached a place
of safety. -
DRIVERS will do well IL they will
stop their vehicles back of street
cars. Some drivers deliberately
creep slowly up to within one or
two feet to where car Is stopped.
This is a bad practice, as IL tends
to cause passengers getting off cars
to become bewildered seeing a We
hicle coming towards them. II YOU
are In doubt as to distance Of space
-stop-don't take chances.-M ID.
S.)
Q. What is a flash test for oils
and how is 1t made?
Tho flash
of the amount of heating an oil will
stand before the vapors given off
will flash or catch fire. To make
this test place a quantity of oil in
a porcelain vessel and, place a gas
flame underneath to heat IT. Place
thermometer in the oil to indicate
the rise in temperature and when
the vapops rising from the surface
can be flashed by a lighted wax
taper. the reading on the Their
mometer will indicate the flash
point. A special thermometer must
be used to indicate Temperatures to
$50 degrees or 700 degrees Fahren-
heit.
@. What is the cause OF noisy
valves and how can they be cor
rected?
A. A certain clearance between
valve stems and push rods is, of
course, necessary. As this distance
increases due to wear the valves
become more noisy and should be
readjusted. The noise cannot al
ways Ibe~ entirely eliminated.
Q. Why should It make any dif-
ference which way. the battery Is
placed In the carr The lights burn
and the starter works no matter
which side is grounded. The only
difference ] see Is that In one case
the q al a r.a d. E.I,.,