The Washington times., 1920-05-01
Ear Must he Rim at Moderate Speed to Tune Motor

most important factors involved In
the satisfactory operation OF an auto
mobile are the bearings. And II Is
the bearings that In new Ear are apt
TO refuse to be imposed upon before
they are properly introduced TO their
arduous duties.
No Job for Novice.
At the factory engine bearings are
ntted very carefully. The job itself
Is not one to be undertaken by a
novice. IL is painstaking work oven
for an expert TO obtain proper pear
ing surfaces. But a perfect bearing
surface never is a hand made job, but
the result OF gradual wearing In
process going on during the engine .
operation under load. In spite or the
fact that bearings as well as shafts
are finished with the mechanical pre-
cision or exceptionally accurate ma
chimes the final fitting OF the bearings
In the better cars at least-is done
by hand, by the sporting in process
In which a good deal OF the success
depends on the dexterity OF the opera
tor and the care with which he pro-
ceeds.
The babbit metal with which plain
-
pressible to a certain extent, so that
after the bearing surfaces have been
hammered by many thousands OF ex-
plosions they take a certain set
with the result that they become
measurably larger. This being the
case. the factory very sensibly ad-
justs the bearings as close as posi-
be, we'll knowing that the nrst few
hundred miles OF road travel VIII
open them to the proper Mt. What the
motorist should keep before him In
the first few days OF his companion
ship with the new car Is that within
the initial five hundred miles the bear
ings may run hot; this applies with
particular force to the main engine
bearings which In case of damage
cannot be reached except by the ex-
expensive process OF partially dis-
ma ntling the motor.
Aside from the "set" a babbit-lined
bearing gradually assumes a degree
like smoothness that comes only from
actual service contact Of the bear
ing and the shaft turning In IL. Be-
fore that time the bearings retain q
certain rouRhness which even the
most careful scraping, spotting. and
fitting cannot eliminate. Even the
most generous fabrication is often
unable to reduce the friction thus set
up to a point not involving temper
airy danger.
Give IL .Chance To Walk"
II you happen to be one of those
who change their cars from season to
season, just as you would change
your spats, passing the cast-ofr beau
ty to a less affluent motorist, you
probably needn't worry much about
the manufacturers advice to give
your automobile a chance to walk
before compelling IL to produce genu-
Inc speed--that is unless you burn
your bearings out some seventeen
miles from anywhere and have to be
towed behind a mule, who in turn, is
bossed by more or less chocolate.
hued gentleman whose time suddenly
becomes worth a lot OF money.
II you are OF that ilk, the worrying
probably will be done by the second
hand car dealer and ultimately by the
chap who falls heir to your procrasti-
nations. But II you are a member of
that much larger motoring family
which is the mainstay and meal ticket
Of our American automobile industry,
the kind that treats even inanimatf
machinery with a consideration for
the lack of which the most ingenious
ly designed and built mechanism can
not live out it's allotted time, then you
will not succumb to the temptation TO
make your butcher look like bum"
just because he tries to pass you on
the way to the Toadhousc where
'Mumm" is the word.
1t is an excellent plan not only TO
drain the crankcase OF all oil after
the first 200 miles. but TO wash the
entire lubricating system with kero-
sene. The desirability OF this step
becomes evident when 1t is considered
that in a brand-new engine small
particles of metal are shaken OF
which fall into the oil base and are
carried into bearings together with
the lubricant. To guard against this
danger, the drained engine base
should be filled with a gallon OF
kerosene. After that the engine
should be turned over a half-dozen
times by the electric starter. the ig-
milton swith, OF course, being "off," so
as to prevent the starting of the mo-
tor. In this fashion the kerosene is
distributed all through the lubricst-
ing system and whatever minute
metal particles are encountered are
led to the bottom of the crankcase,
from which they emerge when the
latter is finally drained of the kero-
sene.
After the engine base has been fill