3 minute read
BlueTec exhaust gas cleaning system
Operation
BlueTec exhaust gas cleaning system
M47_00-0035-01
Press fuel filler cap (2) downwards until the catch engages.
BlueTec exhaust gas cleaning system
The BlueTec exhaust gas cleaning system essentially comprises a supply tank, a catalytic converter and an AdBlue metering system. It is monitored and controlled electronically. Pollutants in the exhaust gas are converted into environmentally friendly substances through a combination of the addition of AdBlue and the effect of the catalytic converter in the exhaust silencer. To function correctly, the BlueTec exhaust gas cleaning system requires the addition of a reducing agent (AdBlue). The addition of AdBlue does not form part of the routine scope of bus maintenance – it is the responsibility of the vehicle operators to ensure that the AdBlue supply tank is regularly replenished. Filling and operating the bus with AdBlue is mandatory for compliance with emission regulations and is thus one of the conditions for the road traffic approval of the bus. The road traffic approval of the bus will be invalidated if the bus is operated without AdBlue. Legally, the bus would no longer be permitted to be operated on public roads. In some countries, operation of the bus without AdBlue may be considered to be a criminal offence or a violation of administrative law punishable by fine. Support in the purchase or operation of the bus, e.g. tax relief, road tax, may also be invalidated retrospectively. This may be the case both in the country in which the vehicle is registered and in other countries in which the vehicle is operated.
Danger.
It is essential that work relevant to safety or work on safety-related systems be carried out at a qualified specialist workshop.
Danger.
Always have maintenance work carried out at a qualified specialist workshop which has the necessary knowledge and tools.
Note:
AdBlue freezes at a temperature of approximately -11 °C. The bus is equipped with an AdBlue preheating system as standard. Winter operation is therefore guaranteed, even at temperatures of below -11 °C.
Environmental protection
AdBlue is biologically degradable. Unless it is handled properly, however, AdBlue constitutes an environmental hazard. Do not allow AdBlue to enter the sewage system, surface water, ground water or soil in significant volumes.
Danger. Risk of poisoning and injury.
AdBlue is not considered a hazardous substance according to German regulations governing hazardous substances. Nevertheless, certain points should be observed when handling AdBlue. The AdBlue line system and the related system components are pressurised while the engine is warm. There is a risk of scalding from hot AdBlue spraying out if the line system is suddenly opened. There is also the risk of skin irritation or damage to the eyes if AdBlue comes into contact with the skin or eyes.
Wear protective gloves
Wear protective clothing
Wear eye protection
Work on the exhaust gas aftertreatment system should not be commenced until approximately 4 minutes have passed as individual lines continue to be flushed with compressed air even after the engine has been switched off.
Turn the ignition switch to the OFF position and remove the key before work is carried out on the SCR system. Allow the AdBlue line system to cool down Open line connections and system component covers/caps slowly. Capture any AdBlue that escapes in a suitable container and dispose of it in an environmentally responsible manner. Do not pour AdBlue into drinks containers. Wipe up any spilled AdBlue, especially as there is a risk of slipping. AdBlue collected in this way must not be poured back into the AdBlue supply tank. If AdBlue comes into contact with the skin, rinse affected areas of skin copiously with clean water. Quickly change out of clothing that has come into contact with the substance. In case of contact with the eyes, rinse them immediately and copiously with clean water and seek medical attention if necessary. Operation
