The Washington herald., 1921-02-27

thermo-syphon type, any obstruc-
ton must be looked for in the ra-
diator or in the engine side Of the
water system. Open the drain cock
and see how the water flows out.
II the water does not flow out of
the radiator 1t means probably that
there is an accumulation of foreign
matter in the lower tank or in the
CONSTRUCTED passages of the radia-
tor itself. In this case the best
thing TO do is TO pass the job along
to radiator repair station. Some
times as much as four pounds of
muck have been taken out of a rad
iator-suficient reason for inter-
rupted water circulation. On occa-
sion air under pressure blown into
the system may move the obstruc-
tion and permit the water to circu-
late again.
Examine Cooling System.
1t is important to have the cool
ing system gone over thoroughly
at the beginning of the touring sea-
son. Also, it will pay the average
car owner to be a little more par
ticular about the sort of water he
pours into the cooling system.
1t takes only a small amount Of
dirt poured into the cooling system
on successive filings to make an
accumulation of filth that will cause
serious obstruction. Even when the
obstruction is not enough to cause
stoppage of the water circulation it
may seriously impede 1t, which
makes the engine run hotter than it
should to be at it's best.
In the case of the pump cooling
system there will obviously not be
satisfactory circulation unless the
pump is working. II anything goes
wrong with the pump overheating
will be the immediate effect. In
cars having this type of water oir-
culation the pump is the obvious
first inspection to make.
The growing popularity of ther-
mostatic control introduces another
possible cause of overheating. If,
for any reason the thermostat fails
to act when the water gets hot, so
that the passages remain closed and
the water Is prevented from circu-
lating. overheating will quickly re-
suit. The function of the thermo-
stat, II must be remembered. is not
to help cool the water after it gets
hot. but to heat it when it is sold.
Perhaps the commonest cause of
overheating Is the presence of carl
bon deposits in the cylinders of the
engine In fact, overheating is one
important indication that carbon
deposits have been formed in the
cylinders and on the piston heads.
As matter of fact overheating due
to carbon Is generally accompanied
by knocking. backfiring and a sort
OF general debility without waiting
for the intended spark, Naturally
an engine that has very heavy car
bon deposits requires frequent re-
Punishment of its water. 1t makes
no difference how the spark lever Is
moved, the incandescent carbon par
ticles in the cylinders cause ignition
regardless of the spark.
Therefore, the only cure for over
heating induced by this condition Is
to have the carbon removed. In
cases where overheating develops
while the car is on an extended tour
carbon removal can be attended to
In some of the shops that make a
speciality Of the work when the tour
lists are stopping for the night.
Every city has a garage or repair
shop that will attend to this work.
Other Causes.
But overheating may have other
fundamental causes than these. The
timing Of valves and ignition often.
plays a considerable part in this
trouble, not to mention carburetion.
II carburetion il poor, so that an
mixture is fed to the
cylinders, the fuel will burn instead
OF exploding and the effects will be
the same as IL one had run with a
retarded spark. The mixture burn
Ing slowly instead of exploding
comes in contact with q
greater area of cylinder wall than
I should. A greater volume of heat
Is passed through into the cooline
water and the result is overheatinr.
The modern carbureter has such =
vide range of adjustment that there
should be no trouble in finding lust
he right mixture not only to avoid
but to get maximum
,ower and snap out of the engine.
Ear owners who have tried the ex-
pertinent of using affbar Laro..