2-12 CHASSIS MODIFICATIONS E UROCARGO Euro 4/5 Drilling the chassis 2.3 Drilling the chassis When it is necessary to mount assemblies or auxiliary units on the chassis, as a general rule, the existing holes made at the factory should be used. Under no circumstances should the flanges of the supporting member of the vehicle be drilled unless in compliance with the indications given in point 3.3.1. In those cases (installation of shelves, brackets etc.) where it is necessary to drill new holes, they must be drilled on the vertical web of the side member and must be carefully deburred and reamed.
Position and Size The new holes must not be made in areas of high stress (such as supports for springs) and at variance with the cross-section of the side member. The diameter of the holes must be proportional to the thickness of the steel. Under no circumstances must this exceed 15 mm unless otherwise specified. The distance from the centre of the hole to the edges of the side member must not be below 40 mm. The centres of the holes must never be located at a distance of less than 45 mm from each other or in relation to the existing holes. The holes must be staggered as shown in Figure 2.2.
When moving spring support or crossmembers, the same drilling arrangement must be used always maintain the original boring. Figure 2.2 91445 2.3.1 Screws and nuts As a general rule, materials of class 8.8 are recommended. Class 8.8 and 10.9 screws must have been hardened and tempered. For applications of diameter ± 6mm, stainless steel parts are recommended. Approved finishes are Dacromet and zinc coating, as detailed in Table 2.2. A Dacromet finish is not recommended if the screws are to be subjected to welding. If space allows, use screws and nuts with flanged heads. Use self-locking nuts. Nuts must be tightened using a torque wrench set to the correct torque setting for the fixing.
In general, use connectors of the same type and class as those for similar fixings on the original vehicle (Table 2.6). Drilling the chassis Base - January 2008 Print 603.93.431