The Oskaloosa herald. (Oskaloosa, Mahaska County, Iowa) 1885-1919, 1917-08-02


when running fast and to retard il
when running slow? Also should the
spark be retarded on first or second
speed and particularly when there is
heavy pull7
The spark should be advanced for
running fast and retarded for running
slow. the exact speed below which the
spark should be retarded depending on
the individual car. Proper control of
tanning maximum efficiency from the
motor and also in reducing fuel con-
sumption. less gasoline being required
when the spark is advanced the cor
rect amount than when the throttle
alone is depended upon to control the
speed. A knocking sound in your mo-
tor will tell you at once when your
spark is advanced too far, though after
practicing spark control for time you
will become so used to the require
ments of your particular car that you
evil never let this injurious condition
occur. Ordinarily it is not necessary
10 retard the spark when running Oh
first or second speed, as the motor is
turning over more rapidly than on high
gear. However, when the engine is
called upon to meet a heavy pull Of
such difficulty that 1t is slowed down
perceptibly it is generally better to re-
tard the spark sufficiently to prevent
preignition.
What objections would there be to
using light grade of lubricatins oil in
the radiator for cooling, instead of wa
ter, during the winter months? This
would rot the rubber connections, but
could this not be overcome by sheIaek-
ing the inside of the hose with several
coats?
The use of lubricating oil will allow
the cylinder metal to become hot. The
oil is not as good heat conductor as
water or the water mixtures usually
recommended. Shellac will not help
much in protecting the hose. as in
short while it may loosen. The use
of lubricating oil in the radiator will
add weight to the car, and the gases
given off after the oil has become hot
are injurious.
When my car is driven over thirty
five miles an hour the engine runs wild.
think the clutch slips. How can this
be prevented?
There is simple remedy for the
trouble of which you speak. Remove
the handhole plate on top OF the gear
set housing, and by looking into the
gear set you will see a finger, or dog.
There are three such fingers. and each
has at its end set screw held in
place by a cotter pin. Remove the
cotter pin, give the set screw one-half
turn and then replace the pin. Do the
same with the other two fingers.
There is knock in my four cylinder
car which cannot locate. When on
hard pull, If the throttle is opened lit
tie too much, there is a sharp knock,
which can be heard quite a distance.
The main bearings have been taken up,
and so have the connecting rod bear
inos. The valves have been ground and
the carbon scraped out as we'll as pos
siSle without taking off the cylinders,
but il seems to be getting worse all the
time. At speed of twenty miles per
hour the car runs almost perfectly, but
when give it more gas the knocking
begins. Can you give me an idea as to
the cause of this trouble7 One of the
cylinders is slightly scored front and
rear, just in line with the wrist pin, but
this was not caused by the wrist pin
becoming loose.
The knock In your motor would seem
to be due to carbon. The fact that you
have attempted to remove the carbon
without taking the cylinder head off
would indicate that a small amount of
carbon still remained. A partial re-
moyal of the carbon is oftentimes
worse than none at all, as small pro-
jecting points are left that become in
candescent and cause preignition.
Here are other causes of knocking
which you should investigate in the or
der named: Poor mixture, spark ad-
vanced too far and worn rings. 1t is
assumed, of course. that all your bear
ings are tight.
We would therefore advise that you
first burn or scrape the carbon from
the cylinders and then adjust the mix
ture very carefully. 1t might also be
beneficial to have the cylinders repair
ed and fitted with oversize pistons, in
asmuch as you state that one Of the
cylinders is slightly scored.
Can you explain the different meth
DDS Of testing the effeetual working of
the spark plugs in giving equal and
uniform explosions, II there is any va
ration owing to the strength or power
Of the spark7
The operation of the spark plug can
be readily determined by eye. All that
is necessary to do is to place the spark
plug points at the proper distance
apart. which is between one sixty
fourth and one tbirty-second inch for
magnetic use, and then after this ap-
proximate adjustment is made remove
the Mug from the cylinder and start