Remove/install front exhaust system · ar4910p7284oid · Mercedes-Benz WIS

AR49.10-P-7284OID

Remove/install front exhaust system

07.12.2018

Engine

654.9, 656 in model 167

1	Front exhaust system
2	Clip
3	Bracket
4	Bracket
6	Exhaust temperature sensor downstream of SCR catalytic converter
N37/8	NOx sensor control unit downstream of SCR catalytic converter

P49.10-A019-05

 Warning	Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.	Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.	AS49.00-Z-0001-01A
 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
Topical note	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
 	Remove/install
1	Remove the rear engine support.		AR22.10-P-4360OID
2	Release and disconnect electrical connector of the exhaust gas flap controller (M16/57).
3	Remove the exhaust gas temperature sensor downstream of the SCR catalytic converter (6) from the front exhaust system (1).	 Installation: Coat the exhaust gas temperature sensor thread downstream of the SCR catalytic converter (6) with heat-resistant lubricating paste.
		 Union nut, temperature sensor to catalytic converter	*BA07.04-P-1002-02A
		Paste, hot lubrication 1 kg, DBL 6879.20	*BR00.45-Z-1005-06A
		 Box wrench bit	*000589690300
4	Remove the NOx sensor with NOx sensor control unit downstream of the SCR catalytic converter (N37/8) from the front exhaust system (1).	 Installation: Coat the thread of the union nut for the NOx sensor with heat-resistant lubricating paste.
		 NOx sensor at front exhaust system	*BA07.04-P-1005-02A
		Paste, hot lubrication 1 kg, DBL 6879.20	*BR00.45-Z-1005-06A
		 Box wrench bit	*000589710300
5	Secure the rear muffler against falling.
6	Disconnect the front exhaust system (1) and rear muffler at the mark (arrow).	 Commercially available devices/tools Chain pipe cutter
		 Installation: Install a new clamp.
		 Clamp, connecting point for front of exhaust system to rear of exhaust system	*BA49.10-P-1013-02T
7	Remove the front exhaust system (1) from the bracket (3).	 Clamp/screw, front exhaust system to	*BA49.10-P-1006-02T
8	Remove clamp (2).	 Installation: Replace clamp (2) and seal.
		 Clamp/screw, front exhaust system to	*BA49.10-P-1006-02T
9	Remove the front exhaust system (1) from the bracket (4).	 Screw, bracket for decoupling element to front exhaust system	*BA49.10-P-1008-02T
10	Detach and remove the front exhaust system (1) from the elastomer bearing.	 Aid of helper required.
	Check
11	Check the front decoupling element and elastomer bearing for damage and wear and replace if necessary.	 Nut, decoupling element for front exhaust system to body bracket	*BA49.10-P-1009-02T
	Clean
12	Remove combustion and corrosion residue at connecting points.
13	Install in the reverse order.
 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	Perform engine test run and check front exhaust system (1) for leaks.

 Sensors

Number	Designation		Engine 654	Engine 656
BA07.04-P-1002-02A	Union nut, temperature sensor to catalytic converter	Nm	45	45

 Sensors

Number	Designation		Engine 654	Engine 656
BA07.04-P-1005-02A	NOx sensor at front exhaust system	Nm	60	60

 Exhaust system

Number	Designation			Model 167 with engine 654	Model 167 with engine 656
BA49.10-P-1006-02T	Clamp/screw, front exhaust system to	Diesel particulate filter	Nm	14	14
		Bracket	Nm	20	20

 Exhaust system

Number	Designation			Model 167 with engine 654	Model 167 with engine 656
BA49.10-P-1008-02T	Screw, bracket for decoupling element to front exhaust system	M8	Nm	20	20

 Exhaust system

Number	Designation			Model 167 with engine 654	Model 167 with engine 656
BA49.10-P-1009-02T	Nut, decoupling element for front exhaust system to body bracket	M8	Nm	20	20

 Exhaust system

Number	Designation		Model 167 with engine 654	Model 167 with engine 656
BA49.10-P-1013-02T	Clamp, connecting point for front of exhaust system to rear of exhaust system	Nm	20	20

000 589 69 03 00

Box wrench bit

000 589 71 03 00

Box wrench bit

Repair materials

Number	Designation	Order number
BR00.45-Z-1005-06A	Paste, hot lubrication 1 kg, DBL 6879.20	A 000 989 76 51

Referenced documents

ah0000p500001a Notes on avoiding damage through contamination and foreign objects
ah5400p000101a Information on preventing damage to electronic components due to electrostatic discharge
ar2210p4360oid Remove/install rear engine support
as0000z000501a 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.
as0000z001701a Risk of injury caused by scraping or cutting body parts on sharp vehicle parts
as4900z000101a Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust.