Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1918-11-17
ss|MPL|F|EO LESSONS IN,
CARE OF AUTOMOBILE
ESpert Gives Causes OF Various
Usual and Unusual Noises
e e. From Machine.
TELLS HOW TO LOCATE THEM
Humming or Growing, Knocking
Z Squcaking, Scratching or Grinding
/. and Their Origins-Gucrrlich An
Z swcrs Many Questions OH Auto.
AUTO LESSON NO. ia.

large proportion OF the questions
received by the writer from readers.
relate to car noises wh'ch h NOISES csnso a If
worry The cause OF noise should al
ways be located. AS 1t is an indication
of lack OF luorication. Of worn part
a loose bolt or riVct, or possibly OF a
cracked or partly broken part
The noises are Senerally aescr,oeu
as. knock. grinding or scratenihs
sound. a growi or hum, squeak. Il
hiss. and rafting.
The knock is an indication OF loose
ness; due 10 wear, a ereak or a loose
bolt, and sometimes TO bent part:
The grinding or scratching IS liaole
TO be due 10 IA dirty or Clipped oal! or
roller bearing; TO lack oil !upritation
of bearing. TO a loose or bent part
rubbing against another or 10 me
speedometer gears.
The grow or, hum generally comes
from some Of the gears, bclnS que 70
wear OF them or the bearing OF their
shafts, or TO their being improperiy set:
The squeak may be an indication OF
lack of lubrcAtion. but generally lndi-
Gates a loose body. fender or demouni-
a BILE rim bolt. or comes from the springs
which need fabrication.
which comes from the drawing in or
the air by the carburetcr; or 1t may
ring, and in some types OF demount-
able rims comes from loose lug bolts
EXPERT DISCUSSES UNITS
WHICH MAY CAUSE TROUBLE
Taking up the units one by one and
emitiing the snGins' We Sn have n; nrst no 10
tween the grooves in the discs OF 2
disc clutch and their key pieces will
cause knocking which will seem to
are almost always due to the throw-ont
collar. and bearing. This will be
grinding noise /, is hare to h, keep
there is no load on the bearing. unless
the driver rests his foot on the clutch
pedal so s TO put some pressure on
1T, there is little chance for wear. Many
drivers, however. rest their foot on
the pedal constantly. as described
above, and so cause wear, which soon
clutch is disenEased, then you can be
reasonably sure that the clutch throw
Next after the clutch comes the
transmission or gear set. Even on
new cars there will usually be hun.
low or second This is due to the set
ting or cutting OF the gears. and can
not be cured and does no harm. II
the noises develop with the using of
fabrication, to worn bearings and. on
an older car, TO worn gears. Replacing
or repairing the bearings Is. the only
remedy. III there is Il scratching sound
while In high, then the bearings arc
broken or cut up. and need quick re-
placing.
After the transmission comes the
universal Joint. y squeak from these
is sign of lack Of grease, while n
knock. which comes when starting or
acceleratinr the car. when going over
rough roads. or when the engine Is
missing, is a sign that the pins OF
bushinE are worn. or bushinE broken
1t should he investigated. Universal
joints are much neglected as regards
grease.
4 knock Very much like that of the
universal joint, hut coming just under
the LETT front seat, Will be due to wear
In the bumper OF the torque arm and
spring bcinG broken.
The dincrcntial assembly Is the next
unit from which noises come II will