SHOP MANUAL
Engine
Ch 1 page 38
The reductant flows from the inlet at a pressure of about 9–10 bar and first passes the prefilter (2), fills the ducts
after which the sensor (3) reads the pressure and temperature.
The dosage quantity is determined by the opening time of the solenoid valve (5). It opens once per second
and the amount of time that the solenoid valve is open during that second determines the dosage quantity. The
opening time can vary from 5–95% of 1 second. The reductant is metered to the exhaust gases via the nozzle
(4).
After the engine has been switched off, the reductant pump continues to pump reductant to the reductant doser
to cool it, otherwise the reductant doser can be damaged by the heat in the silencer. No metering takes place
but the reductant flows out to the reductant tank via the restriction valve (1) and the outlet. Cooling stops when
the temperature is not critical in the reductant doser.
A graphite gasket (1) is fitted on the reductant doser which
seals against the evaporator in the silencer (against the
hydrolysis catalytic converter in industrial and marine
software applications). It should be renewed if the reductant
doser has been removed from the evaporator in the silencer
or the hydrolysis catalytic converter. Also check the nozzle (2).
1
2
Do not switch off the main switch until cooling of the reductant
doser has nished. The reductant doser can be damaged by too
high a temperature.
CAUTION
Figure 57
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