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3-2
UNDERBODY
llllllllllllilll
| I | I | 1 | I | H HH1|
CENTER DRILL
AS SHOWN
1844
Fig.
3-1-Tram Gage Centering Bolt
ALIGNMENT CHECKING
Body Tram Gage
INFORMATION
An accurate method of determining the alignment of
the underbody utilizes a measuring tram gage.
The tram gage required to perform all recom-
mended measuring checks properly must be capable
of extending to a length of 102". At least one of the
vertical pointers must be capable of a maximum
reach of 18".
Dimensions shown in the upper portion of Figure
3-2 are calculated on a horizontal plane parallel
to the plane of the underbody. Precision measure-
ments can be made only if the tram gage is also
parallel to the plane of the underbody. This can
be controlled by setting the vertical pointers on the
tram gage according to the dimensions shown in
the lower portion of Figure 3-2.
A proper tramming tool is essential for analyzing
and determining the extent of collision misalign-
ment present in underbody construction.
To facilitate centering the tram gage pointers at
the suspension locations, special centering bolts
(same size and thread as original attaching bolts)
may be prepared as shown in Figure 3-1. Use cen-
ter of bolt thread diameter for centering drill
point. Depth of drilled-out cone should be the same
for all centering bolts being used as a "set".
Underbody Alignment Reference
Point Dimensions—(Fig. 3-2)
Dimensions to gage holes and other unthreaded
holes are measured to dead center of the holes and
RIGHT SIDE
T
LINE
Fig.
3-2—Underbody Vertical Alignment Ref. Points
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