-
--
------
------CRASSIS
FRAME
BEPAIBS
S
SeedOD
S.3
CHECKING THE FRONT
CROSS-MEMBER
When
a
car
has
sustained
damage
to
the
front
suspensIon, necessltattng the dismantling
of
the
assemblies, it is essentlal
that
the
chassis frame
should
be checked
for
correct
alignment, especially at
the
front
cross-member.
This will avoid excessive
tyre
wear
and
steering
wander,
etc.
A
method
of
making an
approximate
check is
shown
in Fig. S.3.
Place
the
car
on a flat surface.
The bars should be parallel
to
each
other
at
the
points"
E .. and .. F
II
within
a
tolerance
of
,\
in.
(4
"76
mm.).
Between the points .. G .. and ..
H,"
or
.. J.. and
..
K,"
the
bars should also be parallel
with
a
tolerance
of
i1r
In. (4·76 mm.).
If a
fore
and aft plum-b-bob
centre
line is
dropped
down
from
the
front
and
rear
centre
ofthe
frame and
points also
dropped
down
from
the
bars
at
each
end,
the
points"
L,"
II
M,"
..
N:'
..
p"
may
be
checked
to
the
centre
line
to
ensure
the
alignment
of
the
bars
fore
and aft.
If
misalignment is found in
the
top
bars only, It may
be
that
this can be
corrected
by removing
the
top
bar
'Ia'..; IIEAR OIOSS
....-..
--
-
-
--
~
- - -
t
i
-l
t'-_
.- z
P"
_
~
-=--...J..
'.....
I
'10'
,
15'
- - - -
-_
._.
___
_ _ _ 94"
wtt:Il.IlA,K
--_
._ - - - - - -
I _ _
------.l
I
'.
..
\/
I '
TObERANCE ON
niESE
DIAGQI:lAL S-=4
./
. /
'
....
./
f+--
-
--
-
~j
7'
~
-
'
- _.- I
/ \1 I
>;
.
./
\:
.1
<.
Fig.
5.2
Chassis
dimensionill diagram.
Remove
the
front
suspension and
the
rear
wheels.
Lower
the
frame on
the
three
blocks having
the
dimensions
shown
in Fig. 5.3.
These
locate
the
frame
in such a posItion
that
the
front
cross-member
should
run
parallel
to
the
ground
If
not
distorted.
Bolt on
to
the
front
cross-member
the
(our
bars.
Tool
No.
T.I25.
(See Section Q.)
Parallelism and
alignment
of
these
bars can
then
be
cheeked
by
measurement
and by sighting
one
rod
to
the
other.
When
measured
at
the
points
.. A," ., B," ••
C,"
•• 0 .. from
the
flat surface on which
the
car
or
frame
is placed, all
the
bars should run parallel
to
it
within
a
tolerance
of
-Is-
in. (4'76 mrn.),
and bolting a similar
but
stiffer
bar
to
the
cross-
member,
which can be used as a
lever
to
twist
slightly
the
outer
end
of
the
cross-member
Into its
correct
alignment
with
the
lower
bars.
Section
S.4
STRAIGHTENING A DAMAGED
FRONT END
Correct
alignment
of
the
front
suspension Is
of
such
vital
importance
that
if
there
is
appreciable
distortion
of
this
member,
It
should
be
renewed,
due
to
the
fact
S.3
Wishvilles Classic
Automobile Library
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