Triumph TR6 PI Operation Manual page 385

CHASSIS FRAME
- Alignment check
76.10.02
BODY
Whilst severe damage to the chassis is readily
detected, less serious damage may cause distortion,
that is not visually apparent. If steering and
suspension checks indicate a fault which cannot be
attributed to anything other than chassis distortion,
the chassis frame should be checked for twist and
squareness. Reference should be made to the
appropriate sections of the manual where component
removal is necessary for access to checking points.
Checking for twist
I. Position the vehicle on a clean level floor.
2. Place a jack under each jacking point and remove the
road wheels 74.20.01.
3. Adjust the jacks until the following conditions are
achieved:-
Points 'A' are 24"97 in (63'40 cm) above the floor.
Points 'F' are 24'94 in (63'35 cm) above the floor.
This condition sets the datum 20 in (50'8 cm) abo¥e
the floor.
If the height of points 'A' cannot be equalised, the
difference in height of points 'A' indicates the amount
by which the chassis is twisted.
Checking for squareness
4. Transfer all the lettered points shown to the floor,
using a plumb-bob and fine cord.
5. Letter the points on the floor and connect each pair
by drawing a line between them.
6. Mark the central point of each line and place a
straight edge along these mid points.
7. Check for squareness.
8. Using a straight edge mark the diagonals as shown.
9. Check for squareness. If the chassis is square then
each pair of opposite diagonals must be equal in
length and the points of intersection must lie on the
same straight lIne.
10. The extent of lateral chassis distortion is assessed by
the amount and direction by which any central point
on the transverse line and/or the point of intersection
of any pair of diagonals deviates from the centre line.
Triumph TR6 Manual. Part No. 545277 Issue I
76.10.02 Sheet 1