Quality Shortcomings And Component Defects - Volvo Penta TWD1672GE Manual

Fault handling
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 of time, 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.
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 – please contact your local Volvo Penta representative to discuss the issue.
50
Quality shortcomings and
component defects
If the system signals a quality shortcoming or
component defect, check the following:
•
that the level sensor in the AdBlue
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 sensor for the AdBlue
connected.
• that there are no leaks in the exhaust system where
substantial amount of solution can escape.
If the fault can not be reminded with any of the above,
refer to EATS Inducements, page 51.
47711094 08-2022 © AB VOLVO PENTA
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