SPECIAL INSTRUCTIONS FOR -SCR- EXHAUST SYSTEMS 6-23 E UROCARGO Euro 4/5 Installation of the form of dosing in relationship to the catalyst SCR: Figure 6.26 Mixer pipe length Silencer Example of DM installation: - exhaust pipe angle of inclination 45°. - rotation of DM +90° SCR catalytic converter The exhaust pipe input into the SCR catalytic converter must be as low as possible 123272 NOTE The exhaust pipe input into the SCR catalytic converter must be located as low as possible.
If the cata- lytic converter is turned so that the exhaust pipe input is located in the upper part, there is a danger of the hot exhaust gases going back into the dosing module if the engine stalls, with a consequent risk of damage. Distance of the DM from the SCR catalytic converter: On IVECO Cursor engines, the distance of the DM from the SCR catalytic converter must not be less than 1200 mm. Lower distances must be checked and authorised in each individual case. In some conversions, it may be necessary to locate the SCR catalytic converter in a new position on the vehicle.
Taking into consideration the above conditions, the exhaust gas (start or mixer pipe to the inlet of the SCR plug) may be extended up to 3 m. A further extension of the exhaust gas pipe makes it absolutely necessary to insu- late the pipe to avoid excessive heat dispersion with a possible consequent mal- function of the SCR system SCR. An overall exhaust pipe length of 6 m must not be exceeded under any circum- stances. The distance ( X ) between the DM and the next bend depends on the angle and the following distances must be complied with:
- 30° bend > distance 150 mm - 45 bend > distance 200 mm - 90° bend > distance 300 mm If an adaptation should be necessary due to the tubomixer, the following require- ments must be observed: To prevent the formation of sediment in the exhaust pipe behind the mixer due to sharp edges or welds, a connection to the mixer must be created at least 10 mm before the end of its internal duct. 123273 Specifications for installation and removal Print 603.93.431 Base - January 2008