2-50 CHASSIS MODIFICATIONS E UROCARGO Euro 4/5 Modifications of the engine air intake and exhaust system 2.9 Modifications of the engine air intake and exhaust system 2.9.1 Intake The specifications of the engine air intake and exhaust systems must not be altered without prior authorisation from IVECO. Modifications carried out must not alter the vacuum levels (for the intake) or the original exhaust back pressure levels. Table 2.18 - Engine back pressures The air intake must be positioned to avoid the intake of hot air from the engine and/or dusty air snow or rain.
The apertures for the intake of air which may have to be made in the side of integral bodies, must have a working surface of not less than two and a half times that of the master hose located upstream of the filter. These apertures (e.g openings in the grill) must be of such a dimen- sion that they do not become obstructed. It is prohibited to alter the air filer or replace the original filter with a lower air capacity unit. Any connections on the intake duct must guarantee resistance of the tube to penetration by water or dust and free from sharp/ rough edges (or welding burrs inside metal tube). It is not permissible to modify or substitute the original air filter.
2.9.2 Engine exhaust The routing of the exhaust pipe must be as even as possible. Bends must not have an angle of less than 90є and the radii should not be less than 2.5 times the external diameter. Avoid kinks and use cross-sections which are no smaller than those corresponding to the original system. Any connections on the intake duct must guarantee resistance of the tube to penetration by water or dust and absence of sharp edges or welding burrs inside the tube. Sufficient clearance should be maintained (min. 150 mm) between the exhaust pipe and the electrical system, plastic hoses, the spare wheel, the plastic fuel tank (min. 100 mm), etc. Lower values (e.g.
80 mm) may be permitted if suitable sheet metal shielding is used. Further reductions require the use of heat insulation and the substitution of the plastic tubes with steel pipes. It is not permissible to modify or substitute the original air filter; the silencer body cannot be altered. Modifications to the silencer body and engine equipment (injectors, engine control unit etc.) are not permissible as this may alter the correct functioning of the engine and adversely affect the emissions of gases from the exhaust. Chapter 6 concerning SCR contains additional information on exhaust system changes.
NOTE Modifications of the engine air intake and exhaust system Base - January 2008 Print 603.93.431 Engine Engine Code Maximum exhaust back pressure (kPa) Maximum intake back pressure (kPa) E14 F4AE3481C 10 6 ,3 E16 F4AE3481D E18 F4AE3481B E19 F4AE3481A E19 F4AE3681C 28 6,3 E22 F4AE3681B E25 F4AE3681D E28 F4AE3681E E30 F4AE3681A