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6-8
SERVICE RECOMMENDATIONS
CHASSIS SUSPENSION
(
20 6)
all t
ires is one of th e most
important elements
of t
ire care. Correct
tire
pressure
is also of
great importance t
o ease of
handling
and
rid-
ing
comfort. Overinflation is
detrimental to
ti
r e
life but not
so much
as
under inflat ion.
Correct
tire inflation pressure
is as follows
:
fVhen
Tires
fVhenTires
A
re
Cold
A
re fVarm
FRONT
FRONT
and
and
Series
REAR
R
EAR
40
26
lbs.
29
lbs.
50
24
lbs
.
27 lbs.
70 except 1948
79
. .
22
lbs.
25 lbs.
1948 Model
79
. .
.
.
261bs.
291bs.
In temperatures below
freezing
inflate
t
ires
2 lbs.
higher.
WARNING:
It
is
not possible
to
in flate tires
correctly
when
hot.
Driving without tube valve
caps
contributes
to
underinflated
tires.
The
valve cap keeps
dirt
and water out of the valve core
and seals
t
he
val
ve
against leakage. Whenever tires are in-
flat
ed
be sure to install valve caps on all tubes
and tighten firmly by hand. Make sure that
r
ubber washer in cap is not damaged or missing.
If
t
ir es
are
checked at
frequent
intervals
an
d
adjusted to correct inflation pr essur e, it is
often
possible
to detect punctures and make a
correction
before
a tire goes flat, whi
ch
may
severely
damage tire and tube if car is in mo-
tion.
Th
is
is because
tubes usually do not go
flat for days or even
weeks after
they
are
punctured.
Slight
differences
in pressure be-
tween tires
will
always
be found, but a tire
that
is found to be
3 or more pounds below the
lowest of its r
unning mates can be
suspected
of having
either a
leaking
va lve or a
punct ur e.
b.
Tire
Inspection
All tires
should be
ins pected
re
gular ly
to
avoid
abnormal
deteriorat ion
from
preventable
cause
s.
If
t
ires
sho
w
ab
nor mal or
uneven
wear
the cause
should be determined
and correction
should
be
made.
See t
hat
no
metal
or
other foreign material
is imbedded in the t
read. Any
su
ch
material
should be removed to prevent
damage
to tread
and t
ir e carcass.
Cuts in
a tire
whi
ch are deep
enough to ex-
pose the
cords
will allow
dirt
and
moisture
to
work into
the
carcass and ruin
the t
ire unl
ess
promptly
repair ed. Attention to cuts a
nd cr acks
in tires
containing synth etic rubber is particu-
larly important
because
cuts
spread
more
rap-
idly in
synthet ic
than in natural
r
ubber.
Shal-
low cracks or cuts
may
be
arrested
by
grooving
but deep cracks or cuts should be repaired
promptly.
Tires wh
ich
are
worn
smooth
a
re more
likely
to skid on wet surfa ces
t
han tires with
a nor-
mal anti -skid design. Wa
te r
is a lubricant to
rubber
and there are
n
o sha rp edges and gut-
ters in a
smooth tire to scrape the water off
and
allow the tire t
o
make a dry
path
in which
to
run.
In
addition, smooth tires nat ur ally are
not
as
thick as new tires
and
therefore punc-
ture more easily.
It
is
good
practice
to
replace
sm
ooth
t
ires
with new tires as insurance against
tire
accidents.
Figure 6
-8
-Method
of Interchanging Tires
c. Interchanging Tires
Tires
t
end
t
o wea r unevenly
and become un-
balanced as
mileage
accumulates. Uneven
t
ire
wea r is f
requently
the ca
use of t
ire noises
whi
ch
are attributed
to
rear axle gears,
bear-
ings,
etc., and
work is
somet imes
needlessly
don
e on rear ax
les in
an
endeavor to
correct
the no
ise.
Tir e
life
will be
increased and unev en
wear
and
noise will be
less
lik
ely
to occur
if t
he tires,
including the
spar e,
are balanced
and int er-
changed at r
egular intervals
of
approximate ly
5000 mil
es.
The recommended
method of inter-
changing
t
ires is sh
own
in
figure
6-8.
d. Use of Tire Cha
ins
Do
not
use
tire
chains on
the
front wheels
un
der any circ umstances
because t
hey
will in
-
terfer e with the steering
mechanism.
Any
of
t
he
conventional
fu
ll-t ype
non
-skid
t
ir e
chains
can be used on the rear wheels.
Tire chains should be
loose enough t
o
"creep"
but ti
ght
enough
to avoid st r iking
f
ender
s
or
other
parts.
If
cha ins remain in one
position
the tire side
wall will be
damaged.
Tension
springs (either
metal
coil springs or the
rub-
ber band type
) must also be use
d in ord
er t
o
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