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Exhaust cleaning
The engines are fitted with an exhaust gas cleaning
system which cleans the exhaust using the urea
solution AdBlue. AdBlue is injected into the exhaust
system at a point between the turbo and the silencer,
which has an inbuilt SCRcatalytic converter. The
catalytic converter is used to reduce emissions of
nitrogen oxides and particulates.
But in order to comply with the legal requirements of
Euro 4, the exhaust gas needs further treatment,
AdBlue is added.
Fuel
For the catalytic converter to work optimally, sulphur-
free (max 10 ppm sulphur) fuel should be used, in
accordance with European standard EN590. As a
temporary measure, fuel with up to 350 ppm sulphur
content is permitted.
AdBlue (Urea solution)
The urea solution is sold under the trademark AdBlue.
It is a colourless liquid consisting of a mixture of urea
and distilled water. It may have a slight smell of
ammonia. The urea concentration of AdBlue is 32.5%.
AdBlue fulfills the ISO standard 22241-1 (previously
DIN-70070) and is the only Volvo approved urea
solution for filling in Volvo trucks with Euro 4
engines. AdBlue may also be sold and marketed under
other names depending on the distributor and may be
used as long as the ISO standard 22241-1 is fulfilled.
AdBlue is not hazardous but it should be handled with
care. If AdBlue is accidentally spilled on the truck,
rinse the area with water and dry off with paper or a
rag. The solution can be aggressive when hot and can
therefore damage, for example, nearby electrical
connectors, electrical wiring and hoses if spilled.
AdBlue freezes at approx. –11 °C, but this is not a
problem, as the SCR system is heated. The truck can
be started and driven normally.
Exhaust cleaning 293
Caution!
AdBlue that has been modified or
replaced with another liquid that
does not comply with ISO
22241-1, will lose its intended
cleaning effect and can damage
the SCR system.
Caution!
AdBlue is very corrosive and can
damage electrical connectors. If
AdBlue gets into electrical
connectors or wiring, they must
be replaced. Cleaning electrical
items is not enough.
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