Albuquerque morning journal. [volume] (Albuquerque, N.M.) 1903-1926, 1920-08-01
THE AUTOOUIZ

Answers to Last Weeks Questions
locating the various engine
KNOCKS is difficult without previou,
experience. Each part not adjust.
ed properly will give forth a sount
different from that of any other
part, and finding the particular
sound is not easy without the use
of listening devices or former train.
ing. TO locate n main bearing
knock run the engine on two cyl,
lnders at a time, operating one
cylinder on each side of bearing
The front bearing Is usually the
last to become loose. Play at these
points will produce a hard bump
caused by end play in the crank
shaft, loose, scored or burned bear
ings. Grooming of the motor when
it is first turned over is created
by the latter defect. A hollow,
heavy sound, or q sharp bump,
comes from a loose connecting rod.
70 locate the rod cut out one cyl
lnder at a time, or If very loose 1t
can be found by turning the engine
over by hand. A loose wrist pin
in the piston will give a metallic
knock. This lOoseness Is caused
by wear, crooked or broken pin,
or from too tight fit in the piston
or connecting rod. Speed up the
engine suddenly, then throttle down
quickly to locate the knock. A
loose crankshaft will give a thud
or slap, and will cause the gears
to rattle at times, 1t is caused by
worn or burned bearings or end
play in the shaft. A very heavy
knock comes from the flywheel
being loose, which sound is pro
duced regularly. A loose piston
in the cylinder and loose valve rods
often produce "a similar sound, be-
ing a short slap or knock. When
coming from the piston it means a
piston too small for the bore OF
thA cylinder. When from the
valves it is caused by excessive
space between valve stem ana push
rod, worn valve or rod guides,
valve seat out Of true or bent OF
sticking valve stem. Valve ROD
rollers or poor Giants may also
cause a knock. -,
2.--Leaking spark plugs Will
cause motor to miss on heaVH
pulling or high speed, and yet WIN
not affect il in light pulling OF SLOW
speed. Cracked or porous coiiui-
ton of the porcelain in the pug
or leakage around the porcelain
cause the trouble, allowing the hlgh
tension current to ground without
crossing the spark gap,
3-Do not run a car on a dead
tbn generator rs
usually protected with fuse WhlcH
can be removed when the battery
is not in use, to prevent eAcesstNe
internal current from ia masliiS
the field and armature windlngs'
if is wiser to play safe in attohdlne
70 the battery at regular Intervals
keeping it always in CONDITION tor
use. .4,,,
1.-The total number of mofor
vehicles produced in the uhitea
states during 1919 is l,974,olo' III
GLIDING trucks. -..o,,
5.-Driving chains used on motor
ears are usually in three loril's
the silent chain, the roller cnaiu'
and the block chain. The slle4 u
chain is commonly used TO orlVe
cnmshafts, motors. generators anu
water pumps. Roller chains are are
made to drive the rear wneels or OF
both automobiles and trucks W
some makes, and in some case
drive the camshaft and trahsnil'
the cranking power from the start
or to the motor. The block chaln
is rarely used for driving purposes
on the machine at present.
6.-There is a form of insurance