2-20 CHASSIS MODIFICATIONS E UROCARGO Euro 4/5 Further indications - Protect the surfaces from oxidation as described in point 2.2.2. - Restore the electrical and braking systems as described in points 2.15 and 2.16. - For changes to the drive line follow the instructions given in point 2.8. 2.4.5 Chassis stress level When lengthening a wheelbase, in addition to local reinforcement on the side member joint, the bodybuilder must provide suffi- cient reinforcements to achieve the section moduli of the side member section no lower than that designed by IVECO for the same wheelbase or for next size up. Alternatively, when permitted by local regulations, larger subframe sections can be used.
The body builder shall verify that such stress is not greater than the one of the chassis with the original wheelbase, by assuming an evenly distributed load and the chassis being considered as a beam resting on the suspension supports. In any case, more restrictive limits (if any) set by the national standards shall be complied with. When extending out from the longest original wheelbase the reinforcements must depend on the length of the extension, the type of body built and the use to which the vehicle is to be put.
2.4.6 Cross members The necessity of applying one or more additional cross members depends on the length of the extension, the location of the transmission shaft support, the welding area, the introduction points of the forces produced by the body and the condition under which the vehicle is to be used. Any supplementary cross members must have the same features as those already existing (flexural strength, torsional strength,quality of the material, connection to the side members, etc). In Figure 2.6 shows an example of the application. A cross member is mandato- ry for any extension over 600 mm.
As a general rule the distance between the two cross members must not be greater than 1000 to 1200 mm. The minimum distance between two cross members must not be less than 600 mm, particularly for heavy-duty and off-road use; this limit does not apply to the ”lightweight” transmission support cross member. Figure 2.6 91449 Modifying the wheelbase Base - January 2008 Print 603.93.431