Remove/Install Catalytic Converter - AR49.20-P-0100MFC

Engine 260 in model 118, 177, 247 

Courtesy of MERCEDES-BENZ USA

Shown on model 177 with engine 260 except code M016 (Performance-enhanced engine) up to model year 2022 

Courtesy of MERCEDES-BENZ USA

Shown on model 177 with engine 260 except code M016 (Performance-enhanced engine) up to model year 2022 

Courtesy of MERCEDES-BENZ USA

Shown on model 177 with engine 260 except code M016 (Performance-enhanced engine) up to model year 2022 

Shown on engine 260 as of model year 2022 

Courtesy of MERCEDES-BENZ USA

	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
	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 danger zone.	AS49.00-Z-0001-01A
	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
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
	Remove/install
1	Remove fan unit.		AR20.40-P-5050MFD
2	Attach radiator guard plate.
			WF58.50-P-0110-01A
3	Remove inerting line from catalytic converter (3) and place to one side.	Engine 260 in model 118, 177, 247 with code 2U8 (Alternative refrigerant) Do not crush or kink inerting line or subject it to tension. This will result in damage to the inerting line and can impair its functional capability.	AR86.10-P-0119MFC
4	Remove heat shield from exhaust gas turbocharger.		AR09.40-P-6045MFC
5.1	Remove nuts (2) from catalytic converter (3).	Engine 260 in model 118, 177, 247 up to model year 2021 Clamp/nut, front exhaust system to exhaust gas turbocharger	*BA49.10-P-1001-02Q
5.2	Open clamp (19).	Engine 260 in model 177, 247 as of model year 2022 Replace clamp (19). Clamp, catalytic converter to turbocharger	*BA49.10-P-1013-02Q
6	Unscrew screws (5) and remove holder (4).	Bolt, upper front exhaust system holder to lifting eye/exhaust system	*BA49.10-P-1002-02Q
7	Remove oxygen sensor upstream of catalytic converter.		AR07.04-P-0086MFC
8	Release, disconnect electrical connector of lambda sensor downstream of catalytic converter and expose electrical wiring harness.		AR07.04-P-0085MFC
9	Remove bottom cover (6) from bumper.
10	Remove electrical wiring harness at alternator.	Engine 260 in model 118, 177, 247 with code B01 (48V technology)	AR15.40-P-5060MFA
		Engine 260 in model 118, 177, 247 except code B01 (48V technology)	AR15.40-P-5032MFC
11	Remove heat shield (18).	Engine 260 in model 118, 177, 247 with code B01 (48V technology) Bolt, heat shield to engine carrier/crankcase/oil pan/cylinder head	*BA22.10-P-1002-02E
12	Expose engine wiring harness (7) on connecting carrier (8) and mounting support (arrows).	Dismantling tool	Fig 1
13	Remove screws (9) on left and right of connecting carrier (8) and remove connecting carrier (8).	Ensure that rubber mounts on cooler and washer fluid reservoir are seated correctly. Aid of helper required. Bolt, connecting carrier to front axle carrier/radiator support	*BA62.30-P-1003-02O
		Bolt, radiator support to mounting support	*BA62.30-P-1004-02O
14	Release and disconnect electrical connector of transmission oil cooling coolant circulation pump (M13/7).
15	Unclip coolant hose (11) from refrigerant compressor and brackets (13) of transmission oil cooling coolant circulation pump (M13/7).	Dismantling tool	Fig 1
16	Remove screws (12) of holders (13) of transmission oil cooling coolant circulation pump (M13/7).
17	Place transmission oil cooling coolant circulation pump (M13/7) to one side together with engine wiring harness (7) and fix in place.
18	Remove right front axle shaft.		AR33.30-P-0620MFA
19	Remove heat shield of front axle drive shaft.		AR49.00-P-1000-05MFC
		Bolt, heat shield to engine carrier/crankcase/oil pan/cylinder head	*BA22.10-P-1002-02E
20	Remove screws (14) at connection between catalytic converter (3) and exhaust system.	Clamp, rear exhaust system to center exhaust system	*BA49.10-P-1008-02Q
21	Remove screws (15) at rear holder (16) on oil pan and remove rear holder (16).	Bolt, lower holder for front exhaust system to oil pan/exhaust system	*BA49.10-P-1005-02Q
22	Remove screws (17) at front of crankcase.	Stud bolt/bolt, front exhaust system to crankcase	*BA49.10-P-1003-02Q
23	Remove catalytic converter (3) downwards.	Install catalytic converter (3) such that it is free of tension. Aid of helper required. Replace seal.
24	Install in the reverse order.
	Check
25	Check installation position and unobstructed movement of exhaust system and correct if necessary.
	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
26	Perform engine test run and check exhaust system for leak tightness in area of catalytic converter (3) while doing so.

Fig 1: Identifying Dismantling Tool (000 589 95 63 00)

Courtesy of MERCEDES-BENZ USA