The Washington times., 1916-08-05
Motorists Problems
ANSWERED by Expert
Kind of Oil Affects Carbonization of Cylinders
J" Many Other Questions Are Explained by
- Automobile Expert.
BY w. H. STEWART, JR.

can move the protruding part Of The.
axle up or down or sideways about an
eighth Of an inch. Should not the axle
TT snug In the rSlet bearing s,s az ,o dn,r
bearings are worn and need replace
ment7 The roller bearings rattle con-
siderably when taken out and shaken.
e, M.
II Ia evident that the roller bearings
are badly worn and need replacing.
They should be d snug fit around the axle.
Since you have already taken them out
for inspection you will need no instruc-
lions for substituting new ones.
have a Metz runabout with Bosch
magnetic set spark: Holley Detroit car
buretor. When I start my car in the
morning II starts easily. but after It
has run for an hour or so. It becomes
tank and drain off the carburetor and
then crank about three minutes before
II will start again. READER.
The fact that you have to drain
the carburctor in order to start engine
suggests water In the gasolene. but that
does not explain why the engine starts
readily at one time and not at another.
Tic next time you find It difficult TO
start draw off little gasolene on tho
hard and see IL there are drops of water
In IL. Also look at valve lifters while
engine Is hot to see II they are holding
and valves open. thereby releasing COM
preston. Also look for leaks In inlet
manifold or around carburetor that may
open up when heated Inspect carbure-
tor and ingnition systems very careful
~. as the trouble may be somewhere
among them.
My motor sputters and misfires when
start It up and later runs all right.
What ia the cause OF this7 ." c. r.
Tho trouble Is undoubtedly due to a
cold motor. The gasolene and air are
chilled and. do not mix properly. After
the eng'ne Is heated up the gasolene va
porize moro readily, effecting a better
mixture, consequently the engine docs
not miss explosions.
Why 10 the selective type transmits
sion 50 widely used? Are not the pro-
gressive and planetary types Just as
goodf They were used on many cars.
T. X.
The planetary type is still used, to
some extent. but It has only two speeds
forward and is apt to be noisy on low
gear. The progressive type Of sliding
gear requires one In meshing gears to
pass through a speed not required. Thus
to lack out OF danger you would mesh
second. first and reverse gears. II the
gear teeth were In line you might not
be able to do It. With the selective
type OF sliding. gear you 20 directly to
the speed intended. and there Is no
danger Of sliding past that speed.
NotorinD nen.rtnept rha r,~,..
What is meant by 4 "stone-bruiseT'.
~ @. o.
A stone-bruise In a shoe IL due to
q blow from a stone or other hard
substance while running at high speed
or at medium speed with tire partly de-
fated. The shoe is .pinched between the
stone and the rim and the fabric Is
broken. This makes a weak spot In the
tread or side wall and soon there Is
blowout You may demonstrate this
as follows: Lay a piece of rubber on
q hard surface: place thin piece Of
on top. Strike heavy blow with the
edge OF a hammer and the cloth will
be broken where 1t was hit. but the
rubber will be uninJured.
Occasionally I hear a popping noise
at my carburetor? Is 1t dangerous?
Please give cause or causes. f. n.
Popping back or back firing at car
buretor is exceedingly dangerous II the
carburetor has just been prlmed or
there is much OF a leak. 1t Is caused by
lean mixture. leaky inlet valve. or cleo
trical troubles at times on distributor.
which causes an explosion In cylinder
when inlet valve is open. Look over
these parts carefully. as occasionally a
car burns and Is totally wrecked from
just this cause.
Automobile Editor. The Times-The tires
on my car are called quick detach-
able" but 1 find 1t takes half an hour
Of hard work to remove one. How can
make 1t easier to take them of?
A. r.
The trouble is probably due TO rust,
as a quick detachable usually comes off
very quickly. After removing. clean OF
all rust carefully and paint the metal
parts with graphite and sheliac, or the
special rim paint which can be obtained
at any supply store. Some use graphite
and oil or graphite and grease. which is
good whore metal surfaces come to-
gether, but should not be applied where
the shoe and tube can touch 1t.