Evening star., 1922-04-30
Answer. to Last Week. Questions.

Answers to Last Weeks Questions.
l. The cause of battery jars or
covers becoming distorted and soft is
high temperature of the battery, a
condition brought about by charging
at too high q rate. This shprtens the
life of the battery, as the plates and
their separators are also injured.
2. One indication Of a weak bat
terry is lights burning dim. especially
when the car and engine are idle. This
however, as q battery insuficiently
charged will cause the trouble, as
will grounded connections and cor
roded battery connections.
3. Most electric system troubles
originate not in the generator or bat
terry. as is generally supposed, but IN
wiring. switches and lights: II these
parts are neglected, dimculties In OBJ
tanning sufficient current either from
the generator or battery Will result.
4. Engine trouble resulting from
a crack in a cylinder IS d1fficult to
locate, not only remedy. Usually IT
is when the engine IS brought up to
a high Temperature by operation that
the defective cylinder is evident. and
when boiling of the cooling water.
oyerheating of the engine and mis-
firing result. Perhaps the simplest
way to ascertain II a cylinder is
cracked Is to fill the cooling system
bling at radiator cap will be noticed
during the cranking operation.
5. It is practically impossible to
freeze cooling water in an engine
while the engine is in operation. II
cannot freeze in normal climates un-
constantly in motion. circulating
from radiator to water Jackets. and
IA also warmed above the freezing
point But beware Of freezing when
the car stands idle. Do not allow 1t
to stand for any length of time with
cut some coid-weather Protection.
g. Cold air protectors for the radi-
ator are advisable in winter even
though anti-freeze solution is used.
The additional protection keeps the
engine warm, and, what is more i'm
portant, permits Of easy starting.
rapid heating and proper vaporizing
of the fuel mixture, thereby provid
ing a smooth-running engine in
shorter time.
Z. An engine with all working parts
In good condition should negotiate an
upgrade as quietly as if driven on
level road, even though it is operated
slowly If knocking is heard when
tributed to loose or worn parts or
bearings to carbon accumulated
within the cylinders or to defective
spark, advanced spark or wrong fuel
mixture.
s. A loose cranksl1aft bearing pro-
duces a rather heavy knock, or rather
two knocks at close intervals during
a revolution. In extreme cases the
vibration caused by play in this bear
ing may be felt by the driver
9. The only practical remedy for
scored cylinders is reboring. They
could be reamed. but this is usually
not successful, as the reamer invarf-
the pistons. which may not be quite
correct. ReborinG or enlarging of
the cylinders calls for diversified pis-
tons and rings to insure smooth and
quiet operation and good compression
Of the engine. Scoring may not al
ways be caused by lack Of fabrication
of cylinders, It may be due to foreign
particles working their way into the
oil, and then to the piston or ring
surfaces and, cylinder walls, where
the constant friction would wear
scratches and grooves in those sur
faces. Likewise the cylinder Oil may
be Of poor sade; ssdde;oat with tr,nt' .nsnicient
heat and possible scoring. Quality
Of the oil is just as important as
quantity il proper fabrication is de.
sired.
ted successfully in old and worn cyl
nrassicay round % and md
there Is a short distance where the
piston does not travel. New rings to
be fitted to the cylinders must be
made small enough to pass by these
unworn distances. and consequently
at loosely when they reach the worn
part Of the cylinders. Likewise CYL