Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1919-09-14
.S|MPL|F|ED LESSONS IN
CARE OF AUTOMOBILE.
Expert Car Mechanic Describes That
Part Of Machine Termed The
Final Drive"
SHOULD HEED GROWING NOISE
Indicates Pinion and Gear Arc Not
Properly Set Cp-lnquirics Of
Many Readers Answered by En-
Sinccr Gucrrlich.

The d1rivinG; MECHANISM Of, an auto
device f foT h trsns dnitf the Pdwsr
OF the propeller shaft TO the driving
aNles of the rear wheels. which arc Il;
right angles TO the propeller shaft: and
q device. called the diucrcntial. which
takes care OF driving the rear wheels
at the different speeds they must re
Notvc when the car is making a turn.
Probably tho least perfected ard
most Unsatisfactory mechanism % he
entire car is the device used for
changing the direction Of tho drive OF
ci the driving aNles. III practically all
pleasure cars ih's IS accomplished by
The use OF Ivvc' GEAR and pinion.
While in t-rcis i worm and worm gear
Unless the hcyel gear and piaon are
SCI lust riGhi, there Will he a hum
axle. while il they ar. set Improper y
10 any extent they Viii almost surely
The adjusting OF the driving rnion.
az the bevel p;nion is called. IS. there
fore. a job which should only be done
by an expert mechanic VINO has had
experience in this work.
Indicates Improper Setting Up
When bad growing" noise come >
from the rear axle housing tho ADJUST
ment OF the p!njon should immediatc!y
ge looked to. as the "sro"f is an IN
dica,ton that the ,pinion and scar are
Let us see what the b.vel gear aro
pinion are; why their proper adjust
ment Is so important. and how they
are adjusted.
\ bowel gear is one used for driving
from one SHAFT 10 another. when these
ether Whe iha sS Hss 70 joint Gne a sn
also do this II can only be used when
the shafts arc at bu, slight angle,
&c out OF a straigh, line, while the
berel gear can be used for driving at
any predetermined angie
,-o s,Eu and -, Shows hsys a rart Of eerr'
ms the small driving gear is termed
pinion y glance viii show how. when
The pin'on rr%yoives on its ans i, VIII
AXIS, which ANS in this case is at a
right angie TO that Of the rin'on.
BY s;udyinS the gear YOU VIII OBJ
serve that. because the inner portion
al the teeth are in a circle who's" diam
eter Is smaller than that or tn. circle
on which The ou;or portion of the teeth
ing wider on the outside. as at y. tina n
ON the inside, as a. + The same is
true Of the spaces between the teeth,
than on the inside. AS the teeth OF
the pinion must just fl into tho spaces
Of tho gear. as tho pinion spaces must
Just fit tho gear teeth. the spaces and
tooth OF the pinion Will also be Iapcred.
1t is because tho teeth arc tapered
that such care must hc taken in set
en- 'i' StstI anu DlHlcI.
NIny Cause Stripped Genr.
obviously. If the pinion were set too
far TO the right. tho wide portion OF it's
'ecth would have 10 get into the mar
rover space Of tho gear, while IL set
too far TO the left the wide portion
Of the gear teeth would come into the
narrower piniou spaces. When this
happens there can he but one result
namely. broken or stripped gear.
Because OF play in the gear and pin
len, they may be, and very often arc
set slightly out. without stripping. but
when his Is the case there invaria bly,
IL a growing" sound in the rear axle
housing.
Not only must the gear and rinion b
set properly, with respect to having
tho teeth fit into their proper spaces.
but they should be set so tina; tho top
of the tooth comes 20 about one sixty
fcurh OF an inch from tho bottom Of
its space II SGT closer than this tho
teeth will bottom" which will also
cause a "growl,' while IL set too far
away there will he cumming.
Figure shows the pinion the pinion
shaft, tho pnion shaft housing the
n!nion shaft bearings and the adjust
ing nuts.
II II were NECESSARY 20 move the
pinion to tho right. the M, a. and it's
lock nut o. would hc looscncd and