The frame Section A
Checking for squareness
1 Reference
to
Figure
1 shows the critical
points by
which
the Saloon and Van chassis
should
be
checked for squareness. Transfer
these points
to
the floor and letter them
as
shown
in
Figure
2.
2 Connect the
letters in pairs
by
drawing a
line between them, using a straight edge, AA,
BB,
CC
and DD,
as
shown.
3 Measure from each point in turn
to
the
centre and
join
up all centres thus producing a
centre datum
line
XX.
The diagram on the
floor
should then
be
similar
to
Figure
2.
4 A further check on squareness must be made
by
joining
up
all the diagonals, the lengths
of
which
must be equal, and bisect each other on
the datum
line.
Chassis distortion is always assessed
by
the
amount and direction
of
any transverse or
diagonal lines from the datum line.
Severe damage
to
the chassis frame is readily
apparent. In some cases, however, lesser damage
may cause distortion
of
the frame,
which
may
not
be
easily detected
by
visual inspection.
Even
when the vehicle has suffered only
superficial
damage
it
is possible that the frame
members may have been
displaced, causing
misalignment
of
the road wheels.
It
is recommended that the alignment
of
the
front and rear suspension attachment points is
checked
including wheelbase dimensions.
See
General Specification.
All
components including front suspension and
rear road springs must be removed
to
provide
access
to
the checking points. The checking
must
be
carried
out
on a surface table or level
floor.
2
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