White Pine news weekly mining review. [volume] (East Ely, Nev.) 1910-1920, 1920-09-19

mote Enseiency-parts Are Carefully
Inspected and Tested in Each Sec
ton Before Motor Gets Final o. X.
When an airplanc motor stops some
thing always happens--if the motor IS
In a plane flying at any altitude. Many
a witty story has been told by pilots
and ground men in reply to the ques-
ton "Whst happens il the motor
stopsi'
To follow a motor through the nu-
merous branches Of the aviation re-
pair depot at Montgomery, Ala. and
attempt TO grasp what Is done TO II In
an actual overhaul Is a very interest
Ing process.
The overhaul of an airplane motor
is described as follows, in n statement
authorized by Maj. Gen. Charles I.
Mencher, director Of the air service,
himself an expert mechanic:
o~verhaulino a Motor.
Upon its arrival on the field the
motor Is checked and is Immediately
given. a work order TO guide ii on its
way, and make possible a careful rec
ord Of its repair and cost. 1t is first
taken to the dismantling room, care
fully taken to pieces and transferred
to the wash rack and washed with
kerosene and gasoline. All carbon is
removed and the pistons are carefully
polished to remove all r0ughness, that
o.-k~. ..trlt not oHhnra Sn PaadilV
From the washrack it is transferred
TO the inspection room, where 1t Is
given n most thorough inspection.
Parts which are worn or damaged to
such an extent that they cannot be re-
placed are Immediately ~saivaged.
Parts that are repairable are trans
ferred, where the necessary repairs are
made. and returned again to the In
spector. A triplicate list of all parts
repaired and condemned Is made, one
following the motor, one going 10 the
engineer officer, and one Is kept on
record In the inspection room. After
the motor is passed by the inspectors,
the stock-chaser checks up by the In
spection report the parts which have
been condemned, and draws from
stock new parts to take their places.
lie also draws a complete set of gas
kets for every motor, and tries TO de-
liver the motor 10 the motor assembl!
department as nearly complete as pos
sible.
"The motor now becomes the prop
cry of the motor assembly depart
ment. 1t has gone safely through the
inspectors and all parts are supposed
TO be in perfect condition, but the me-
chanic has a perfect right TO reject
from his motor any part which he hnds
faulty. There is friendly rivalry be-
tween the two departments, the me
ehanic. as a rule, loves to hang some
thing on the inspection department
Thus d double inspection Is developed
In this department the bearings arr
reamed and seraped, all bearings test
ed by dial Indicator tests for clear
ance, valves ground and tested FOL
leaks. Cylinder blocks which have
been drawn from stock and valves
which have passed the factory lnspec'
tors test. after assembly are OTTER
found leaky and do not come up to A
II, ID. test. This test consists of fllins
the intake port hole with gasoline, ant
from inside the cylinder around thu
seat of the valve forcing a 6Opoun'
air pressure. A valve which is, afte'
testing by gasoline seepage, to all np
pearances O. X. will frequently fai
with this air test. After the differen
parts are assembled and the motor j
ready for timing, the ignition parts ar
drawn from that department and In
stalled.
Ready for Test.
The motor. Is now ready for test
and again becomes the property o.
the inspection and test department
This is where they try TO hang tn
crepe on the motor repair. II th'
motor is rejected a report is made b,
the test block section, giving reason
for rejection and suggesting b rem
edy If possible. A report Is made b,
The chief of motor repair of what wal
found wrong, and the correction made
Inc TepoIls 10 " 'hc ehBuheei Va
f1cer, who then does the heavy growl-
ing. After n second and successful
block test the motor is tagged %. X,
the tag showing II. +. NJ, running
time, oil pressure and the kind of pro
peller used. Here again II becomes the
property of the engine repair. If the
engine is to be placed at once in O
plane 1t passes to the final assembly
but If its destination is unknown the
intake and exhaust ports are closed
cylinders filed with oil, the entire
motor sprayed with a protective coat
ing Of cosmoline applied rapidly and
efficiently with an ingenious air gun,