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(22
9)
CHASSIS SUSPENSION
WHEEL
ALIGNMENT
6
- 3 1
following
checks
and
in
spectio ns mu
st
be
made
to
insur e
correct ness
of al
ignment equipment
readings a
nd
alignment
adjust ments.
1. The
front
tires should have approximately
the sa
me wear and
all tires must be inflat ed t
o
specified pr essu r es (par. 6-8).
2.
Check
front whee
l
bea r ings fo
r looseness
and adj
ust,
if necessary (par.
6-14).
3. Check
for r
un-out
of whee
ls
and
t
ires and
correct
to
within
limi
t of
%"
r
un-out at
side of
tires, if
n
ecessar y.
4. Check
wh
eels
and
t
ires
for balance and
correct if
out
of balance
(par.
6-28) .
5.
Check
for
looseness at
king
pins and tie
ro
d ends ;
if found
excessive it must
be
cor-
re
cted befor e
alignment re
adin gs
will
have any
value.
'
6.
Check sho
ck
absorber
action and
correct,
if
n
ecessar y
(par. 6-10).
7.
Car must be
on
a level
surface
and at cur
b
weig
ht
(no passengers, no
load
in car, spare
tires in place
,
and full
of
water, oil, and
gaso-
lin e) .
8.
Bounce car at front and rear ends
several
times
t
o
all
ow
frame to
come
to its
normal
level.
Check spring trim dim
ensions
and make
any
corr ect ion indicated (p
ar .
6-17 and 6-20).
9.
It
is
also
advisabl e
to check the condition
and
accurac y of an y equipment
being used
to
check f
ront
end
alignment,
and to m
ake cer-
tain that instruc tions of th
e m
anuf acturer are
thoroughly
understood.
b.
Checking Caster a
nd
Camber
Settings
Since caster
and camber are both adj usted
by turning the eccentric knuckle support upper
pivot
pin,
both of these settings must be checked
before changi ng either
set ti ng.
CAUTION
:
R
egardless
of equipment u
sed
to check caster and
cam ber ,
car
m
ust
be
on
lev el
sur f ace both
transv ersely
and
fore
and
aft,
and must be at curb
weight.
Since camber
varies in
proportion to
the
height of the
front
springs, it is ve
ry important
that
the
correct
spring
trim
dimension
is
maintained while
checking
camber
(par.
6-17).
When
equipment
is used which bears against
the
tire
or w
heel
rim to obtain readings, it
is
very essential that the
tires or
wheels
be
checked fo
r
run -out . R
eading s
must be taken
at
points
w
hich
have
no run-out or
which lie
in
the
same plan
e.
Caster and camber should be within the lim-
its shown in figure 6-36. Note that
the
caster
angles at both front wheels need not be exactly
the same but must be within
lf2
degree of each
other.
Likewise,
the camber angles on both
sides
must
be
within
%
degrees of each other.
If
caster
and camber are not within the speci-
fied lim
its,
adjust as descri bed below.
c. Ad
justment
of Caster and Ca m b e r
Caster
and camber
must
be adjusted together
to obtain the best average setting of each
within
the
specified limits
given in figure 6-36.
1.
Loosen
pivot pin clamp
bolt
on upper end
of knuckle support.
Remove
grease fitting from
the clamped type upper pivot pin bushing. This
bushing is on front
end
of the right pivot pin
and on r
ear end of left pivot
pin.
See
figure
6-37.
FIITI NG
BUSHING
UPPER
PIVOT
PIN
~
[, c r ~~.
ALLEN
WRENC' \
J·720
LOWER CONTROL
A~
Figure
6-37
-Steering
Knuckle
Supp
ort
and Pivot Pins
2.
Insert
14"
Allen wrench into hex socket
in end
of upper pivot pin, then turn pivot
pin
as required t
o
bring the
caster
and camber set-
tings within the limits
specified in
figu r e
6-36.
One-qua rter turn of pivot pin
changes caster
angle
%.
degree. One-half
turn of pi
vot
pin
gives the
maximum a
vailable
range of camber
ad
justment.
3. Tighten pivot pin clamp bolt and recheck
caster and camber settings. Install grease fit-
tings.
4. Any change greater than
14
degree in
caster will require checking of
toe-in
(subpar.
e, below), since a change in caster will change
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