Replace full load housing ventilation - AR01.20-P-0002MTA

ENGINE 133 in MODEL 117, 156, 176

Fig 1: Exhaust Intermediate Pipe, Steering Gear Heat Shield, Integral Carrier Heat Shield And Right Side Shaft Heat Shield

Courtesy of MERCEDES-BENZ USA

Fig 2: Wide Open Throttle Bleed Line, Oil Separator, Screw And Bolt

Courtesy of MERCEDES-BENZ USA

Fig 3: Vent Line, Coolant Return Line, Purge Lines, Bracket, Wide Open Throttle Bleed Line, Screw And Bolts

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove lower engine compartment paneling		AR61.20-P-1105NKB
2	Empty low-temperature circuit		AR20.00-P-1144MTA
3	Remove exhaust intermediate pipe (1)		AR49.10-P-7100MTA
4	Remove integral carrier heat shield (2)
5	Remove right side shaft heat shield (3)
6	Remove screw/bolt (10) and detach wide open throttle vent line (9) from crankcase	Replace sealing ring.
6		Screw/bolt, crankcase ventilation system vent line to crankcase	*BA01.20-P-1005-01R
7	Remove charge air hose		AR09.41-P-8619MTA
8	Detach coolant return line (6) at charge air cooler
9	Remove screws/bolts (5) at coolant return line (6)
10	Detach vent line (4) at coolant expansion reservoir for low-temperature circuit and provide with coolant return line (6) to one side
11.1	Detach wide open throttle vent line (9) from oil separator (11) Engine 133 in model 117, 156, 176 except code 494 (US version)
11.2	Remove oil separator	Engine 133 in model 117, 156, 176 with code 494 (US version)
			AR01.20-P-9750MTA
		The wide open throttle vent line (9) and the oil separator (11) are firmly connected together over a key-lock connection. Therefore the oil separator (11) and the wide open throttle vent line (9) must be replaced after disconnection of the connection.
12	Detach purge lines (7) from wide open throttle vent line (9) and place somewhat to one side	Do not bend the purge lines (7) too strongly. These will be damaged and must be replaced otherwise. Install new sealing rings.
13	Detach wide open throttle vent line (9) from bracket (8)
14	Unclip wide open throttle vent line (9) at cylinder head cover and remove upwards	Pay attention to correct routing of wide open throttle vent line (9).
15	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
16	Carry out engine test run and check engine for leaktightness while it is running

CRANKCASE VENTILATION SYSTEM, CYLINDER HEAD COVER, CAMSHAFT HOUSING

Number	Designation		Engine 133
BA01.20-P-1005-01R	Screw/bolt, crankcase ventilation system vent line to crankcase	Nm	9