Remove/install injection nozzle for exhaust aftertreatment system

AR14.40-P-2000CDA

Remove/install injection nozzle for exhaust aftertreatment system

28.06.2019

Engine

651 in model 172

with code U77 (Diesel Emission control BLUETEC (SCR))

Modification notes

13.10.2016

Replace seal, added.

Operation step 7

1

AdBlue® line

4

Coolant hoses

2

Electrical connector

Y129

AdBlue® metering valve

3

Clip

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on use, material properties and handling of AdBlue®

AH14.40-N-0001-01A

 

Remove/install

1

Remove bottom section of soundproofing in the center and rear

AR94.30-P-5300W

2

Release and disconnect electrical connector (2)

3

Push the heat protection insulation of the AdBlue® line (1) somewhat to the rear

4

Detach AdBlue® line (1) on the AdBlue® metering valve (Y129) and close off openings with a suitable stop plug

 Installation: Replace seal.

 Record plug

*129589009100

5

Pinch off coolant hoses (4)

 Clamp

*000589543700

6

Detach coolant hoses (4) at AdBlue® metering valve (Y129) and catch escaping coolant in a suitable container

 Installation: Replace clamps.

 Pliers for click clamps

*171589003700

7

Open clamp (3) and then remove AdBlue® metering valve (Y129)


Ensure correct positioning of the AdBlue® metering valve (Y129). The lugs of the AdBlue® metering valve (Y129) must sit in the grooves of the exhaust pipe.
Non-observation leads to wrong assembly and damage to the AdBlue® metering valve (Y129).

 Installation: Replace clamp (3).

 Installation: Replace seal.

 Bolt, AdBlue® metering valve clamp to exhaust system

*BA14.40-P-1009-02D



Clean

8

Clean AdBlue® line (1) at connection

9

Clean seat of the AdBlue® metering valve (Y129) in exhaust pipe and close off exhaust pipe with protective cover

When replacing the AdBlue® metering valve (Y129) and for reuse of the SCR catalytic converter.

 Set of protective covers

*001589019100

10

Install in the reverse order

11

Read out and erase fault memory



AD00.00-P-2000-04A



Check

12

Check coolant level and correct if necessary

Notes on coolant level

AH20.00-P-1142-01CW

 Coolant mixing ratio

*BF20.00-P-1001-04A

 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

13

Perform an engine test run and check exhaust system in the area of the AdBlue® metering valve (Y129) for leaktightness

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 651 in model 172
with code U77 (Diesel Emission control BLUETEC (SCR))

BA14.40-P-1009-02D

Bolt, AdBlue® metering valve clamp to exhaust system

Nm

11

 Coolant mixing ratio

Number

Designation

Engine all (4xWD, CAR, smart)

BF20.00-P-1001-04A

Coolant mixing ratio

Antifreeze/water

Up to -37°C

%

50/50

As of -38 °C

%

55/45

Overview and specifications sheet

BB00.40-P-0310-01A

References to sheet specification

BB00.40-P-0310ZZ