Remove/Install Coolant Circuit Feed Line Of Turbochargers - AR20.20-P-1100MNA

Engine 176 in model 463 

up to model year 2019 

Engine 177 in model 205 

Engine 178 in model 190 

Shown on ENGINE 177 

Courtesy of MERCEDES-BENZ USA

Shown on ENGINE 177 

Courtesy of MERCEDES-BENZ USA

Shown on ENGINE 177 

Courtesy of MERCEDES-BENZ USA

Shown on ENGINE 177 

Fig 1: Coolant Circuit Feed Line Of Turbochargers Component Location - Model 205 W/ Engine 177

Courtesy of MERCEDES-BENZ USA

	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
	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
	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
Topical note	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Remove/install
1	Open hood.	Engine 178 in model 190	AR88.40-P-1000RG
		Engine 176 in model 463 up to model year 2019	AR88.40-P-1000GG
2	Drain off low-temperature circuit coolant.	Engine 178 in model 190.381	AR20.00-P-1144MNJ
		Engine 176 in model 463 up to model year 2019	AR09.41-P-6834MNF
		Engine 178 in model 190 (except 190.381)	AR09.41-P-6834MNB
		Engine 177 in model 205	AR09.41-P-6834MNA
3	Remove left and right air filter housing.	Engine 176 in model 463 up to model year 2019 Engine 177 in model 205
			AR09.10-P-1150MNA
4	Remove cover (31).	Engine 176 in model 463 up to model year 2019 Engine 177 in model 205 Engine 178 in model 190 (except 190.381) Check for correct seating of the cover (31).
5.1	Remove screws (2) and remove heat shield (1) upward.	Engine 176 in model 463 up to model year 2019 Engine 177 in model 205 Engine 178 in model 190 (except 190.381)
		Bolt, upper heat shield to bracket/side heat shield	*BA09.40-P-1006-01ZA
5.2	Remove heat shield from exhaust gas turbocharger.	Engine 178.9 in model 190.381
			AR09.40-P-6044MNJ
6.1	Unclip electric lines (8, 14) from heat shield (21).	Engine 177 in model 205
6.2	Unclip electric line (8) from heat shield (21).	Engine 178 in model 190 (except 190.381)
6.3	Unclip electric line (14) from heat shield (21).	Engine 176 in model 463 up to model year 2019
7	Remove ignition coil (16).	Engine 178 in model 190	AR15.12-P-2008MNB
		Engine 176 in model 463 up to model year 2019 Engine 177 in model 205	AR15.12-P-2003MNA
8	Remove screw (32).	Engine 176 in model 463 up to model year 2019 Engine 177 in model 205 Engine 178 in model 190.381
		Bolt, rear heat shield to bracket	*BA09.40-P-1008-01ZA
9	Remove screws (22).	Bolt, side heat shield to cylinder head cover	*BA09.40-P-1007-01ZA
10	Remove heat shield (21) upward.
11	Remove left intake air duct downstream of left air filter housing.	Engine 178 in model 190
12	Remove boot at left exhaust gas turbocharger and place to one side.	Engine 178.9 in model 190.381	AR09.40-P-6026MNJ
		Engine 176 in model 463 up to model year 2019 Engine 177 in model 205 Engine 178 in model 190 (except 190.381)	AR09.40-P-6026MNA
13	Remove coolant circuit return line with coolant circuit bleed line.		AR20.20-P-1101MNA
14	Remove screws (6) from exhaust gas turbochargers.	Bolt, coolant line to turbocharger/cylinder head	*BA09.40-P-1004-01ZA
15	Remove screw (4) from left exhaust gas turbocharger.	Bolt, coolant line to turbocharger/cylinder head	*BA09.40-P-1004-01ZA
16	Remove screw (5) from right exhaust gas turbocharger.	Bolt, coolant line to turbocharger/cylinder head	*BA09.40-P-1004-01ZA
17	Remove screw (7) on cylinder head.	Replace seals.
		Bolt, coolant line to turbocharger/cylinder head	*BA09.40-P-1004-01ZA
		Assembly tool	Fig 2
18	Remove coolant circuit feed line (3) upward.	Replace seals.
		Assembly tool	Fig 2
19	Install in the reverse order.
	Check
	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
	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
20	Perform engine test run. While doing so, check engine for proper operation and leak tightness

Fig 2: Identifying Assembly Tool (000 589 93 63 00)

Courtesy of MERCEDES-BENZ USA