Remove/install coolant circuit vent line of right turbocharger - AR20.20-P-1201MNA

ENGINE 176 in MODEL 463 

ENGINE 177 in MODEL 205 

ENGINE 178 in MODEL 190 

Shown on ENGINE 177 

Fig 1: Coolant Circuit Vent Line Of Right Turbocharger Remove/Install Components - Shown On Engine 177 (1 Of 4)

Courtesy of MERCEDES-BENZ USA

Fig 2: Coolant Circuit Vent Line Of Right Turbocharger Remove/Install Components - Shown On Engine 177 (2 Of 4)

Courtesy of MERCEDES-BENZ USA

Fig 3: Coolant Circuit Vent Line Of Right Turbocharger Remove/Install Components - Shown On Engine 177 (3 Of 4)

Courtesy of MERCEDES-BENZ USA

Fig 4: Coolant Circuit Vent Line Of Right Turbocharger Remove/Install Components - Shown On Engine 177 (4 Of 4)

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
	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	Unclip electrical line (14) from heat shield (21)	Engine 176 in model 463 Engine 177 in model 205
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/bolts (22)	Bolt, side heat shield to cylinder head cover	*BA09.40-P-1007-01ZA
8	Remove screw/bolts (4, 5)	Bolt, coolant line to turbocharger/cylinder head	*BA09.40-P-1004-01ZA
9	Lift heat shield (21) in front area and remove vent line (3)	Replace seals.
10	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
11	Perform an engine test run and check engine for leaktightness