Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1920-07-21
The Auto Quiz
i.--What is the usual cause Of loss

! 1.--What Is the usual cause OF loss
OF compression In motor?
The usual cause Of lost compress
sion In q motor Is faulty valves OF
piston rings. A number Of troubles
would cause q leakage OF compress
sion at the valves, such al sticking
valve stems or push rods adjusted
so tightly that they do not allow the
valve to close. A valve, will not seat
properly or not at all II the spring is
broken or II carbon gets on the valve
seat. Piston rings, worn. scored,
broken or turn, d 90 that the openings
arc In direct line will lose compress
sion. II leakage does not occur thru
valves or rings, it must OCCUR where
valve caps. printing cups or spark
plugs are inserted In the motor, or
between the cylinder block ard cylin-
dor head.
1.-When an engine exhausts, what
Is the cause Of tho sharp noise heard
at tho end Of the exhaust pipe. or
thru the cutout when open7
The sharp noise heard when an en-
gine exhausts ID caused by the ex-
haust valve opening SUDDENLY under
pressure, and allowing expanded
burned gasses after the explosion to
escape thru the exhaust pipe to the
outer air. The pressure ranges from
45 to so pounds per square inch, con-
seQuently the noise when the gases
are released. The explosion itself does
not create the noise, as the exhaust
valve 10 opened after the explosion
occurs.
8.-What is the mileage capacity
OF a motor truck during it's entire
life? :
Mileage capacity Of motor truck
varies according to make and pur-
poses for which it is used and man
ner in which it is handled. There are
some old trucks which have more
than 100000 miles to their credit.
and still are in use.
4.-What Is the practical method
usually used in removing the ter
n1inal Of storage battery?
The practical method usually used
In removing storage battery ter
minals is to drill hole thru the ter
minal into the center Of the post,
then pry off the terminal with a flat
file or screwdriver. Use a seven Fights
drill for one inch posts and Ave- Fights
drill for three quarter inch posts.
6.-Of what parts is the automo-
bile engine carburetor composed, and
what Is its operation?
The practical carbureters in use
by the average cars OF today are
quite similar in construction and
operation: They are composed Of
the following parts: gasolene inlet,
controlled by choke valve, float
chamber. float connected to the
choke. ventura tube or mixing cham
Der, spray nozzle. auxiliary air In
let, controlled by seating disc valve,
main air inlet, controlled by a. disc
operated usually from the dash and
gas outlet. The gasolene enters tho
carbureter thru the fuel inlet. flows
to the float chamber. The float rises
until the proper level la reached.
when 1t automatically closes the in
rot valve connected to 1t, shutting off
the flow. On suction stroke Of each
piston In the engine. the gasolene Is
drawn in vaporized form into tho
mixing chamber thru the spray noz-
zle, which vaporizes it and mixes 1t
with air drawn thru the main and
auxiliary air inlets. The charge is
sucked into the cylinder from the
mixing chamber, past the throttle
disc and gas outlet. The amount Of
zach charge u regulated according t.