Evening capital news. (Boise, Idaho) 1901-1927, 1919-11-02
GEAR NOISES ALWAYS mean TROUBLE,
PRESENT OR SOON TO COME; PRUDENT
DRIVERS WILL REMEDY CAUSES EARLY
Drivers Who Insist Quiet TT Will
Often Put Up With Annoying Timing Gears Because They
Do Less Work-Poor Lu IRRIGATION and Uneven Wear
Cause Noise and Necesstat Requirements

Geor noises are objectional for
two reasons: They are not very pleas
ant and they indicate abnormal oper-
alton OF the gears which may quickly
lead to expensive trouble Transmits
sion or axle gears, though mounted In
a housing, will, even when in good con-
dition, emit slight hum, for it is
almost impossible to operate two en-
meshed gears without there being some
slight noise. The noises that gears
make when they are not operating
properly are at once detected by the
driver Of the car because there usually
is severe stress In the sound, a loud
howl or some noise which is quite diff
ferent in characteristic from that given
off by two properly fitted gears.
So far as the engine Is concerned the
front end or timing gears usually run
quietly for long periods, but, when
wear sets In, when bearings wear end
wise and force the gears out of proper
mesh, or when chips of foreign matter
get between the gears there is an i'm
mediate increase in noise until 1t be-
comes nuisance. Much OF the engine
noise Is due to these timing gears, the
tappets being secondary.
MONUMENTAL GEARS HELP
The unfortunate thing Is that when
the timing gears do become noisy one
cannot come upon the cause of the
trouble without examining the gears.
They are noisy the driver says, and the
only way really to find out why is to
take off the timing case cover, look at
the gears, feel for backlash and end
play, and then either put in whole
set or a non-metal gear. 1t is possible
often to get quiet front end by sub
stituting fibre or. othert non-metal
gear for metal one. Where all metal
gears are demanded, it is necessary to
match the gears. Usually one new
metal gear in the train will be noisy.
For some reason or other the av-
erage driver will put up with a noisy
set of timing gears, whereas he de-
mands quiet in the transmission and
rear axle. There is a sound reason
for this also. because the gear set
and axle gears do more work under
whether in the transmission, engine or
axle are designed to operate in line,
the teeth must fit in one way only
and not deviate much from that set
ting. They must run always In a bath
Of Oil Should one gear run out OF
t"uc, that is. wabble even the slightest
bit the tooth pressure viii be greater
and there viii be more noise.
WHEN GEAR WA6BLEs
The Intermittent howl you hear from
en- axle or transmission is due TO the
Attenuation of this high stress. One
second it is relieved. the next It is Sc
we're again. Every time the gear wab-
bles you might say there is a pinch
ing of teeth-they press too much
against each other.
In the transmission there are two
or three or more shafts mounted on
bearings i'm the housing. These shafts
carry gears, some of which slide on
n shaft. When the transmission is
new, these shafts and gears will run
In one true circle all the time. Any
change in the position of the shaft
or any change in the gear or Its
teeth will upset the true running OF
the gear and the rsult will be more