South Bend news-times. (South Bend, Ind.) 1913-1938, 1920-05-09

hIONk anu nON Il may AAohAi = NAs'Ai
one from the other? NJ. w.
The difference between a spark
and a carbon knock quite often may
be distinguished by retarding the
spark lever. If the knock stops 1t
indicates a spark knock caused by
zoo early an ignition. II upon re-
tardlng the lever the knock does not
stop. IL probably is a carbon knock
caused by pre-ignition. Further
more. when an engine is badly car
BOMBED il will overhead quickly and
continue to turn over after ignition
switch is off.
Motor Departmental have a
1913 model which has developed
jerking sensation when thrOttled
down TO less than IS miles, but runs
good when going faster. Have
cleaned out carbon by taking off
motor head and ground i'm valves
Have had carburetor adjusted twice
by first class men and have put in
new distributor brush, also new
plugs Still it jerks and runs un-
even when thrOttled down. Could
you kindly advise me in your auto
mobile column what may be wrong?
A. c..
We are inclined 10 think that your
carburetor still needs adjusting, as
the engine probably misses eXplo-
siOns. due to a lean mixture at low
speeds. Make sure there are no air
leaks in the manifold to upset the
mixture. The plug points and dis
tributOr points must be clean and
properly adjusted Also make sure
that you have good and equal COM
preston in each cylinder.
Motor Department:-Kind an
swer the following through your mo-
tor columns: ! have machine
whose electric lights will work fairly
well when the engine is speeded up.
but are very dim when the motor is
not working. The storage battery
seems to be all right as it pulls the
starter. L have also another ma
chine whose regulating points burn
out. This prevents the current from
flowing to the storage battery. The
ammeter shows discharge" when
the lights are on, but will not show
charge" when the motor is speeded
up. Both machines are equipped
with single unit electric system.
ID. z.
Evidently the battery is weak.
/ Test it with a hydrometer aud If il
| is below 1875 have il charged from
an outside source and have charging
dynamo adjusted to keep IL properly
charged. Regulator points do not
, separate properly, causing them to
burn out. If ammeter does not
show charge" the generator may
not be making current, the commu-
tator may be dirty. the brushes not
fit properly, the wires loose or a
fault In the ammeter Do not tam
per with it. but have il Overhauled
by competent repair man.
Motor Department:-How can
prevent the brushes from squeaking
on my generator? Do they need re
newing or is the commutator get
ting rough? J. r.
The squeak is caused by the COM
mutator being a little too dry. \
very light touch OF vaseline or three
in-One oil is all that is necessary. A
good way to apply il is to make
swab of short stick with a piece
of cloth wound round one end Dip
this in the lubricant and draw it
across the cOmmutatOr while revOlv-
ing, touching ii very lightly. The
brushes have a certain quantity of
graphite in them, which is "A nat
ural lubricant, but a touch of oil or
vaseline is good occasionally.
Motor Departm ent:-Recently I
purchased a new siX-cylinder car
and did not drive IT more than $50
miles before two of the connecting
rod bearing burned out and three
of the cylinders scored. In taking
down the motor / found that there
was a great amount of foreign mat
ter i'm the crank case. There seemed
to be plenty of oil. and / cannot
account for the trouble. except that
this dirt caused the parts to score.
Do you think this possible?
c. H.
More than likely the foreign mat
ter clogged the oil ducts and pre-
vented proper fabrication of the
parts. If the flow of oil was stopped
only temporarily it may have beer
sufficient to cause the trouble. Even
though foreign matter gets into the
oil. there is usually a screen which
prevents IL reaching the vital parts.
If there was plenty of oil in the mo-
tor there is no reason why it should
not reach the various bearings, pro-
vided the oil pump was functiOning
properly. You had better examine
the oil pump carefully. 1t may not
be working.
Motor Department;-Wo you
please tell me why IL Is that I've
always got to prime my engine on
the Overland car before she will
start? Thanking you in advance for
any information you can give me,
remaing w. II.
Assuming that your carburetor is
properly adjusted, this can be over
come by installing a simple type
cash primer or choke which will en-
rich the mixture for starting. If the
gap at the spark plugs is too wide or
the breaker points dirty and not cor
rectly adjusted you will experience
trouble in starting.
Motor Department. have been
reading your answers TO questions
asked Dy car owners and they have
been interesting. i have a Ford and
have trouble with il heating. About
10 to u miles driving will start the
water boiling. have put on new
timer and carburetor, filed my coil
points and heightened the spark rod
To time about one-quarter inch, as
IL seemed to heat more when 1 ad-
NrQnCpH the 4 trust I may