Remove/install coolant circuit return line of turbochargers - AR20.20-P-1101MNA

ENGINE 176 in MODEL 463 

ENGINE 177 in MODEL 205 

ENGINE 178 in MODEL 190 

Shown on model 205 with engine 177 

Fig 1: Coolant Circuit Return Line Of Turbochargers Remove/Install Component - Shown On Model 205 With Engine 177 (1 Of 4)

Courtesy of MERCEDES-BENZ USA

Fig 2: Coolant Circuit Return Line Of Turbochargers Remove/Install Component - Shown On Model 205 With Engine 177 (2 Of 4)

Courtesy of MERCEDES-BENZ USA

Fig 3: Coolant Circuit Return Line Of Turbochargers Remove/Install Component - Shown On Model 205 With Engine 177 (3 Of 4)

Courtesy of MERCEDES-BENZ USA

Fig 4: Coolant Circuit Return Line Of Turbochargers Remove/Install Component - Shown On Model 205 With Engine 177 (4 Of 4)

Courtesy of MERCEDES-BENZ USA

	Risk of injury  to skin and eyes due to handling of engine oil. Risk of poisoning  caused by swallowing engine oil	Wear protective gloves, protective clothing and safety glasses. Do not fill engine oil into beverage containers.	AS18.00-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
	Remove/install
1	Drain coolant from low-temperature circuit	Engine 176 in model 463	AR09.41-P-6834MNF
		Engine 178 in model 190	AR09.41-P-6834MNB
		Engine 177 in model 205	AR09.41-P-6834MNA
2	Remove left and right air filter housing	Engine 176 in model 463 Engine 177 in model 205	AR09.10-P-1150MNA
3	Remove cover (31)	Check for correct seating of the cover (31).
4	Remove screw/bolts (2) and remove heat shield (1) upwards	Bolt, upper heat shield to bracket/side heat shield	*BA09.40-P-1006-01ZA
5.1	Unclip electrical lines (8, 14) from heat shield (21)	Engine 177 in model 205
5.2	Unclip electrical lines (8) from heat shield (21)	Engine 178 in model 190
5.3	Unclip electrical lines (14) from heat shield (21)	Engine 176 in model 463
6	Remove the ignition coil (16)	Engine 178 in model 190	AR15.12-P-2003MNB
		Engine 176 in model 463 Engine 177 in model 205	AR15.12-P-2003MNA
7	Remove screw/bolt (32)	Engine 176 in model 463 Engine 177 in model 205
8	Remove screw/bolts (22) and remove heat shield (21) upwards	Bolt, side heat shield to cylinder head cover	*BA09.40-P-1007-01ZA
9	Remove intake air duct downstream of the left air filter housing	Engine 178 in model 190 Vent line clamp to exhaust gas turbocharger/air filter	*BA01.20-P-1003-01J
10	Detach boot on left ATL and place to one side		AR09.40-P-6026MNA
11	Detach bracket of oil circuit feed line to left ATL		AR09.40-P-6040MNA
12	Detach oil circuit feed line on left ATL and place to one side		AR09.40-P-6040MNA
13	Remove screw/bolts (4)	Bolt, coolant line to turbocharger/cylinder head	*BA09.40-P-1004-01ZA
14	Remove screws/bolts (5, 6, 7, 9)	Bolt, coolant line to turbocharger/cylinder head	*BA09.40-P-1004-01ZA
15	Remove coolant circuit return line (10) with coolant circuit vent line (3) upwards	Replace seals.
16	Detach coolant circuit vent line (3) from coolant circuit return line (10)	When replacing the coolant circuit return line (10).
17	Install in the reverse order
	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
18	Perform an engine test run and check engine for leaktightness