Triumph TR2 Service Instructions Manual page 220

FRAME
UNIT
Fig. 3
Illustrating the eight points of the chassis which are generated on the floor below.
4. CHECKING THE SIDE MEiMBERS
FOR TWIST
If, by adjusting the screw jacks under the
chassis frame as described in "Preparation
of Car" page 3 operation a-c, it is found
to be an impossibility to bring the front
cross member and the straight portions of
the rear cross members parallel to the
ground, the frame can be considered to be
"twisted."
5. CHECKING SIDE MEMBERS FOR
CRADLING
(a) Having prepared the car as detailed in
"Preparation of Car" page 3 operations
a-c,it is now standingwith the datum
line parallel to the ground and this line
is 20" from the ground (Fig. 2).
(b) Referring to Fig. 1 it will be observed
that all dimensions are given from this
datum line and by simple subtraction
of these dimensions from 20" it is pos-
sible to calculate their height above the
ground.
As an example, when checking the posi-
tion of one of the front "out rigged"
body supports, the dimension given is
6.94 from the top of the support to the
datum, therefore if we subtract 6.94"
from 20" the result will be 13.06" which
should be the distance between the top
of the support and the floor.
(c) Measure the height above the ground
at several points and subtract the
dimensions obtained from 20". By
comparing the results with the drawing
dimensions, it will be possible to
determine whether the frame is true.
(d) (i) When the difference is greater than
the drawing, the chassis frame is
"
bowed
"
downward.
(ii) When the difference is less that
the drawing the chassis frame is
"bowed" upwards.