2) DRILLING HOLES IN THE CHASSIS FRAME CROSSMEMBER
a Do not drill holes or create notches in the alligator type (third
crossmember).
b When drilling holes in ]-shaped parts, holes in the upper or lower
flange should be no more than 0.35 in (9 mm) in diameter, but no
more than 0.43 in (11 mm) dia, when drilling holes in vertical (web)
section.
c There should be at least 0.98 in (25 mm) of horizontal distance
between holes. Vertical distance should be at least 1.38 in (35 mm).
d When drilling holes in the upper or lower flange, the distance from the
edge of the side rail flange or the gusset plate to the center of the
hole should be at least 3.94 in (100 mm).
e When drilling holes in the web section of the crossmember, there
should be at least 1.97 in (50 mm) from the side rail web section to
the center of the hole.
f There should be at least 0.98 in (25 mm) from the edge of the cross
rail to the center of the hole.
g There should be at least 0.98 in (25 mm) from the corner of the
crossmember to the center of the hole.
h Do not drill holes in gusset plates or other parts when such parts are
attached to side rail joints.
C9
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