, 1920-07-29
VALUABLE HINTS
ON ~0vERHEATING
Extra Precautions Should Be
Taken During Summer to
Avoid Long Delays
SEVERAL COMMON TROUBLES
Leaks In Water System Cause Excess
sive Heatins-Wrons Ignition Tim
Ing VIII Result In Quick Jump
of Temperature.

Overheating is a rather common
complaint in summer, and some
times, while no serious results oc-
cur, the motorist is delayed on the
road and often required to spend no
little time e%ndeavoring to determine
the exact cause. Because there are
numerous causes, every owner should
be familiar with the more common
ones.
All makes of cars but two are wa
ter-cooled. Naturally, in such en-
gines partial depletion of the water
system means an o~verheated engine.
} This is more particularly the case with
thermo-siphon cooled engines, which
require a complete circuit of water.
1t is therefore a good plan for the
owner Of a car with thermo-siphon
cooled engine to see that the radiator
always is full. In a pump-cooled en-
CINE there is more force back of the
water and a lower level may be ar
ried without the danger of over
heating.
Leaks in the water system natu-
rally bring about reduction of water
supply and consequent excessive
heating of what water remains.
Quick Heating.
q Anything tending to interfere with
the free circulation of the water
through the radiator Or the water
jacket keeps the jacket water in con-
tact with the hot cylinders too long,
resulting in boiling of that water.
DISTINCTIONS may be in the form of
dirt or sediment in the radiator,
partially clog the passageways; an
obstruction OF dirt or Jumps or rusty
material in the water jacket.
1t is quite possible for the ignition
timing to be wrong, so that manipu-
lation of the lever will not advance
the spark enough to keep the engine
cool. This is a matter for an ignition
man to correct, as 1t may be due to a
number Of causes, the commonest be-
ing a wrong setting of the timer or
a maladjustment of the interrupter
points.
One of the commonest causes Of
o~verheating is due to a slipping fan
belt. 1t is absolutely necessary for
the fan to cause sufficient air draft
to cool the water as it flows through
the radiator. A slipping belt re-
duces the fan speed and thus cuts
down the draft. The belt should be
taut but not tight. Tight belts usu-
ally wear too fast and break, and they
also wear the pulley bearings.
~. Poor Mixture.
A poor mixture, usually a rich one,
brings about overheating. Carbon in
the cylinders also will cause the en-
CINE to heat rapidly, but at the same
time the engine will lack power, knock
and generally perform poorly. II you
get the whole combination of trouble
indicating engine debility and then
get the o~verheating, 1t usually is a
sure indication Of carbon.
Any drag on the engine, causing II
to overwork, is likely to cause YER
heating. When the clutch slips the
engine has to do more work to accom-
plish a given set of results; also when
the brakes drag.
II the engine should overhead, the
sooner 1t is stopped the better. After
stopping he engine. allow II to cool
for about ten or fifteen minutes; it
depends upon how hot 1t is. Then
add cold water slowly until the sys-.
lem is full. Then start the engine
again, noting through the radiator
filler If there Is circulation.