FRAME
UNIT
I.
DESCRIPTION.
Fig.
I.
A rigid structure is provided, the frame side
members being formed by opposed steel
pressings welded together, giving tubular
type
side members of rectangular section.
Welded at the front and rear ends of the
side members are two tubular cross mem-
bers. The front tube is
l&"
diameter and is
supported by the steering unit and idler unit
mounting brackets welded to the side
members. The rear tube of
1;"
diameter is
welded between the two side members. A
second tube, just forward of the rear one,
protrudes through the side members and
to it the rear road spring shackle brackets
are welded.
The centre of the frame is braced by
channel
sectioned steel yressings forming a rigid
mciform structure and stiffened at its
centre by heavy gauge plates. This structure
carries the gearbox and handbrake mount-
ing brackets.
At the front end but a little to the rear of the
tubular cross member, the frame is braced
by opposed steel
pressings welded together
and forming a rigid box section cross
member. This member forms the lower
points of attachment for the front suspen-
sion and engine mountings. It is built up to
form the upper abutments for the front
road springs and this upper structure is
braced by
adetachable tubular cross member
and by supports to the two side members.
Welded
in
position a proximately half-way
F
along the inner side o each side member are
the jacking brackets. To each cruciform
member
is
welded an outrigger body sup-
port bracket, these brackets pass through
and are supported by the side members.
There are four such brackets.
The complete frame is protected from
corrosion by rust proofing.
2.
THE ASSESSMENT
OF
ACCIDENTAL DAMAGE
For this purpose reproduction drawings of
the chassis frame giving the necessary
dimensions are given as Fig.
1.
Even when a
car
has suffered only superficial
damage it is possible that the frame mem-
bers have
been
displaced which
will
result
in the road wheels failing to track correctly
and it is recommended that the frame is
checked for squareness.
It is possible to check the frame dimension-
ally to a satisfactory degree of accuracy
without first removing the body. For
clarity the chassis frame only is shown in
the illustrations of this section.
D2tails of checks for "twist," "cradling,"
cc
squareness," and
wing,"
are given
in
this section. By canying out these checks
in the order mentioned a great deal of work
is
eIiminated.
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