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NOTICE! The Emission control using SCR-catalyst
may sometime cause some deposits inside the
Exhaust After Treatment System. A thin layer of
deposits (few mm´s) is acceptable and should be
expected - this requires no action. Occurrence of
deposits may vary over time. Continuous operation at
low load and low temperature increases the risk of
accumulating deposits of crystallized AdBlue/DEF. If
the engine is running very cold at low power for a long
period, the crystals will not burn off naturally.
To avoid crystallization, operate the engine on higher
load and temperature during extended periods of the
driving cycles. If the driving cycles are alternated
between cold and hot temperature, the crystals will be
burnt off and removed due to the high exhaust
temperatures.
To manage the EATS at sufficient temperature, avoid
long periods of idling; it may also be necessary to use
engine stop/start functionality, viscous clutch fan and
do a careful insulation of pipes and muffler.
47713625 06-2021 © AB VOLVO PENTA
If deposits are present even though the engine is run
at varying load and are larger in volume than a chicken
´s egg, it is suggested to monitor the deposit size over
time to ensure that there is not growth of the deposit.
It is suggested taking photos including a reference
object like a pen or a matchbox to be able to relate
size when comparing photos over time.
Presence of deposits outside the exhaust lines is a
sign of a bad sealing in exhaust line joints. Deposits
can be removed by cleaning with water and a soft
brush. Joint alignments should be checked and
gaskets replaced before reassembly.
For cases with deposits larger in size – contact your
local Volvo Penta representative to discuss the issue.
Quality shortcomings and
component defects
If the system signals a quality shortcoming or
component defect, check the following:
•
that the QLT (Quality-Level-Temperaturesensor) in
®
the AdBlue
/DEF tank is connected.
•
that system hoses and the injection valve are not
clogged or disconnected.
•
that the injection valve is connected.
•
®
that the AdBlue
/DEF pump is connected.
•
that the SCR system electrical cables are
connected.
•
that the NO
sensors are connected.
x
•
that the exhaust temperature sensor is connected.
•
that the temperature sensors for the AdBlue
is connected.
•
that there are no leaks in the exhaust system where
substantial amount of solution can escape.
•
that the EGR valve is not stuck.
If the fault can not be remedied with any of the above,
refer to EATS Inducements, VE-engines
(EU), page 44.
Fault handling
®
/DEF
43
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