Flush out metering device of exhaust aftertreatment system

AR14.40-B-2031A

Flush out metering device of exhaust aftertreatment system

24.10.2019

Engine

924.9 in model 368, 384.0/2, 685.282/284/289/290, 979.2

with code MS5 (Euro V)

Engine

926.9 in model 368, 382.17/18, 384.0

with code MS5 (Euro V)

1

Metering unit

2

Air blow gun

3

Flush hose

4

Test connection

A

Water column (4 centimeters)

1

Metering unit

5

Syringe

6

SCR pressure sensor hole - compressed air

7

Compressed air pressure sensor (17B06)

Rinse

 Warning

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

1

Turn off ignition

Notes on use, material properties and handling of AdBlue®

AH14.40-N-0001-01A

2

Open the engine access cover

3

Connect Star Diagnosis

4

Install the test connection (4) in the metering unit pressure inlet (1)

Only whether a test connection (4) is not installed yet.

.

AR14.40-B-2042A

 The test connection (4) can be kept in the vehicle.

5

Remove compressed air pressure sensor (17B06) (7)

6

Fill the SCR pressure sensor hole (6) with water

 Fill the SCR pressure sensor hole (6) with water until it overflows.

7

Install the SCR compressed air pressure sensor (17B06) (7)

 .AdBlue compressed air pressure sensor SCR on dosage unit

*BA14.40-B-1008-02B

8

Install the flush hose (3) to the test connection (4)

 A metering hose can be used as a flush hose (3).

 Connect the flush hose (3) only after the SCR system flow process has finished (about 5 minutes).

 Measuring hose

*360589002103

9

Remove the tire valve in the flush hose (3)

10

Fill the flush hose (3) with water until it makes a 4-cm water column (A)

 Hold the flush hose (3) upwards, so that the water flows towards the test connection (4).

11

Install the tire valve to the flush hose (3)

12

Connect the air blow gun (2) to the flush hose (3)

13

Rinse the metering unit (1)


Pressure must be adjusted to 5.5 bar.
Otherwise an extremely high pressure can damage the metering unit (1).

 Actuate the flush hose (3) with compressed air until water is fully eliminated.

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

14

Starting engine

15

Check the compressed air pressure in the metering unit (1) using the STAR DIAGNOSIS

AR14.40-B-2002A

 The actual value 69 should be consulted through the STAR DIAGNOSIS.

If value is out of the tolerance area indicated in the STAR DIAGNOSIS, repeat the flush procedure. If the value, after that, is still not correct:



Replace the metering unit (1)

16

Remove the flush hose (3)

 The test connection (4) can be kept in the vehicle after the test.

17

Disconnect the Star Diagnosis

18

Close the engine access cover

 Exhaust gas after-treatment

Number

Designation

Engine 924.9, 926.9 except Liquid Only

BA14.40-B-1008-02B

AdBlue compressed air pressure sensor SCR on dosage unit

Nm

30