The Oskaloosa herald., 1917-11-01

occurs when the operator is holding
the crank 1t produces q back kick
which is liable to dislocate the shout
der or otherwise injure the arm.
The term back firing is also applied
to an explosion occurring in the cylin.
der during the inlet stroke of the pis-
ton. This would ignite the gas in the
intake manifold and mixing chamber
Of the carburetor. Should gasoline be
near the carburetor it may cause a Sc
rious fire. ., !"
Will you please explain why valves
are reground by alternating rotary mo-
ton in view of the fact that valve tap
pets are arranged to give the valves a
slightly continuous rotary motion in
service7 Also, what are the objections
to the continuous rotary motion in re-
grindins7 RI .s. a5..
Valves are ground by an alternating
rotary motion to avoid scoring the
seats or the valves themselves. You
know that If you were sandpapering n
finely finished piece of wood, such as
an automobile body. preparatory to
| painting 1t you would not draw the
sandpaper around in a continuous path,
for that would leave ridges or scratches.
The same applies to grinding in valves.
Can you tell me the best method Of
cleaning leather upholstery
The best thing to apply to the up
holstery If you would preserve its soft
ness and keep 1t from cracking is a
good leather dressing preparation.
There are q number Of good ones on
the market. Water in which there is a
little ammonia Is also good leather
cleaner. and after using it a soft cloth
should be employed to rub the sur
face of the leather dry.
- .rH.,.., -
What causes gasoline to drip from
my earburetor for few seconds after
stopping the motor?
Probably the float is not adjusted
properly. ... IT.
Do ovsrsixed pistons tend to make a
motor heat7 -....s ...E ........
Yes. IL they are SO tight that they
are stir and create too high compress
sion. If they allow the proper clear
ance they do not overhead the motor.
When removing a storage battery, IL
| the generator wires were connected,
why would not that prevent the wind
ings from burning out?
Because If the generator IS passing
current through itself without any out
let the voltage builds up rapidly and
at high speeds it can reach the point
where the windings will be burned.
" I change a one and one-fourth inch
carhuretor to a one and ene-haIf will
it increase speed without making the
intake manifold Iaresr2
I This depends entirely on how well
the present size Of carburetor and size
and design of manifold are adapted to
| the engine in question. Ordinarily
when the carburetor for touring is re-
placed by one of larger size more speed
results.
Why is the distance between the front
wheels of car greater at the top than
at the bottom7
! The reason for this is to make steer,
ing easier. The object Of tipping the
wheels in this manner is to bring the
point Of contact between the wheels
and the ground in vertical line below
the axis Of the steering knuckle. When
the line Of the center of the steering
knuckle produced Is coincident with
r 10 Of hn fVsa nd he Nj
there is no tendency for the wheel to
be thrown out Of line when an obstruc.
ton Is met on the road On the other
hand, were this point to be somewhat
inside Of the point of contact of the
wheel and the ground there would be q
tendency for the wheel to be turned
about the steering knuckle whenever
an obstruction was met, with the re-
suit that there would be an interfer,
ence with the steering.
How can ! tell whether my motor Is
timed correetly2 When eranking the
motor slowly with the spark advanced
IL kicks back. Does this show that IL
10 properly tined7
Your motor is probably timed cor
rectly. If you wish to check up on
the timing set the spark at full retard
and the piston of No. cylinder at top
dead center. Then examine the break
er box mechanism. If the points for
No. cylinder are just ready to break
the timing is correct
Should there be any up and down
play in an oil pump drive shaft and
would this play cause a knock audible
every revolution Of the cam shaft7
The oil pump drive shaft should be
rigid, and II 1t is loose 1t might cause
a knock.
Can the axle shafts In ssn,ifioating
axle be taken out without dissecting
the axle7 " 90, how 10 this done?
In a semifioating axle the shafts can
not be removed without going to the
trouble of removing the shaft bearings
which are housed In retaihers. The
latter are In most. cases screwed into
the housing.