4. WHEELBASE MODIFICATION
When it is necessary to modify a wheelbase it is important to under-
stand that this modification will greatly change the mass with respect to
the side rails. Caution should be used when modifying the side rails as
this will greatly affect their designed strength. This strength must be con
-
sidered from several different aspects. This type of modification should
be avoided, whenever possible. When modification to the side rails is
unavoidable, the following recommendations should be followed.
1) GENERAL CAUTIONS
a When modifying the wheelbase, do not extend or shorten the
wheelbase beyond the maximum or minimum specifications in the
wheelbase range set by Nissan Diesel Motor Co., Ltd.
b Side rails (including the detachment and addition of crossmembers),
propeller shaft, service brake lines, electrical lines must be modified
when modifying the wheelbase. All modifications must correspond
to the wheelbase configuration as listed in this Book.
2) CUTTING POINT
Cut the side rails where it is straight (not curved) and a low stress
point.
3) MATERIAL
a Use the same material for extending as the side rail.
Material See Section 3. 1) ; thickness should be 0.177 in (4.5 mm)
b When extending the frame, use a material with the same thickness
and shape as the location to be extended.
c Perform continuous welding so the part to be extended and the side
rail are completely connected, then, using a grinder, smooth and
finish the surface. Then fill with reinforcement material.
4) REINFORCEMENT MATERIALS FOR EXTENDED PARTS
The following diagram shows the shape of the reinforcement parts:
When welding to side rails, observe the precautions for side rail reinforce-
ment [section 3.].
C12
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