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AdBlue tank - Correct fluid level - AP14.40-P-1410BT

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ENGINE 642 in MODEL 164 with CODE U42 (BlueTEC diesel exhaust treatment (SCR)) 

Fig 1: Correcting Fluid Level In AdBlue Tank
G00544431DANGERREMOVINGFLUID SPECIFICATIONINSTALLINGCourtesy of MERCEDES-BENZ OF NORTH AMERICA.
DANGER Risk of burn injuries and scalding  when working at AdBlue lines and the components attached to them. Risk of injury  to skin and eyes when handling AdBlue. Risk of poisoning  caused by swallowing AdBlue Pour AdBlue into suitable containers only. Wait until the pressure is released before starting any work on the exhaust aftertreatment system. AS14.40-Z-0001-01A 
Notes on use, material properties and handling of AdBlue®   AH14.40-N-0001-01AB 
REMOVING Removing     
1 Open liftgate or trunk lid and clear access to filler opening of the AdBlue® tank    
2 Fill AdBlue® container with new AdBlue®   AR14.40-P-2014-02GZB 
The filling tools are designed in such a way as to leave an unfilled space in the AdBlue® container after switching off. Never pour in more AdBlue® after switching off otherwise there a risk of damaging the AdBlue® tank!
For USA and Canada only Filling using BLUETEC AdBlue® filling pumps.
FLUID SPECIFICATION *BF14.40-P-1001-01A 
INSTALLING Installing     
3 Seal filler opening of AdBlue® container and close liftgate or trunk lid    
FILLING CAPACITY FOR BLUETEC DIESEL EXHAUST TREATMENT (SCR)

Number Designation Engine 642 model 164.1 Engine 642 model 164.8
BF14.40-P-1001-01A AdBlue tank Filling capacity for the initial filling Liters 28.1 33.3
Filling capacity for a service filling Liters 26.6 31.7
Specifications for service products Sheet BB00.40-P-0352-00A