The Oskaloosa herald., 1917-11-29
Expert Advice For the
Automobile Owner
Queries and Replies Covering Matters Of
Importance to the Man Who Runs a Car


Or there 10 current passing to my
batteries without the aid of an am
meter, and when the ammater 10 not
working how can ! determine whether
the trouble 10 in tho anmeter or
rent passing through il or whether
the generator 10 doing its work or not2
Disconnect one Of the wires and
make and break the circuit with 1T; if
spark is noticed on the break current
Is flowing. This test may be used ON
all sorts of electrical circuits, even on
a single worn out dry cell. II the sys-
tenn has a cut-out and it works prop
crly current is flowing. %T> .
You can determine whether current
= is flowing or not by the method just
described. If current is flowing the
trouble must be In the ammeter. If the
| defect is internal the instrument must
! be returned to the manufacturer, but
sometimes the trouble is simply a
broken or loose connection or stuck
| hand. In the latter case tapping the
instrument may cure the defect.
! Can you tell me If there 10 any In.
furious effect Of gum oamphor on q
motor7 " ... .-.' IT,.
| Very little is known on this subject,
but the general opinion is that it does
not give any increase in power and.
further, has a tendency to carbonize
= the motor.
My car has developed O grinding
| noise that sounds a little like engaging
gears without the clutch pedal being
depressed. have had the mechanic at
the service station work on II after
had tried, but gained nothing. The
noise 10 only made while running at
eight and seventeen miles per hour.
I There is no noise when the engine 10
idiine, as far as can learn. l have
adjusted the starter chain many times
and am satisfied that the trouble is not
there. Could IL be a timing gear loose
or the clutch shaft bearing worm ,...
1t seems likely that the spigot BUSH,
ing in the gear box is worn. If this
is true a new gear and shaft in which
the bushing is mounted must be OBJ
tained. There is also the possibility
that the noise is carried forward from
the rear end. The axle shafts may be
loose or a wheel may be little bit
, wabbly. IA
! When running at the rate of about
| eighteen or nineteen miles an hour tho
transmission of my car makes a grind
| ing noise as though il does not mesh
correctly, but when running below or
over that speed the noise stops. Can
you tell me what causes this2
See that all the gear set bearings are
tight; this may be determined by
grasping the shafts in the hand and
shaking them. Be sure that there is
plenty of grease in the gear box. FL
nally, If you find nothing out Of order
in the gear box, look elsewhere, be-
cause the sound may travel from one
part to another.
WM you please explain the difference
between single, dual, two spark, double
and duplex isnition2 a.
! Single ignition means that there is
but one source of current supply, either
dry cells, storage battery or magnetic.
Dual ignition embodies two current
sources, such as magnetic and dry cells,
but only one set of spark plugs. Two
spark ignition means that there are
two spark plugs, operating simultane-
oisly In each cylinder. Double ignition
consists of two entirely independent
ignition sets so that the complete re-
nloval of one would not interfere with
the operation of the other. The COM.
! mofest example is the high tension
magnetic and battery ignition outfit,
eacll supplying its own set of plugs.
Two maguetos or two battery ignition
systems with individual sources of en-.
ergy would also come within the def
nition Duplex ignitioni is a special
form Of dual: 1t comprises magnetic
for running. with a battery as an aid
just for starting. It Is designed, espe-
cially for very heavy automobiles and
marine motors where the cranking
speed is too slow, for the generation of
spark by the magnetic. This battery
system is not intended for continuous
operation.
Can you give me e recipe for max.
ing rim paint TO keep the tires from,
sticking to them7 'er'.'! IN W a-a.
Paint the rims with a paste made by
mixing graphite with gasoline.
What 10 the maximum presoure;in cyl.
inders, compression sixty five pounds7 2
What per cent would we gain, IL we
doubled tho compression without any
increase in gas or r,ixture2 y "a
Undoubtedly You mean the maximum
explosion pressure, which might be as
much as 450 pounds, although this
would vary with conditions. Doubling
the compression pressure would also
approximately double the explosion
pressure! Your question is a purely
academic one, as you must realize that
IN actual practice doubling the COM
preston would cause preignition In