Remove/install cylinder head cover - AR01.20-P-5014SX

ENGINES 272.946/965/974/975 in MODEL 221 Left cylinder head cover 

ENGINES 273.922/924/961/968 in MODEL 221 Left cylinder head cover 

ENGINES 273.961/968 in MODEL 216 Left cylinder head cover 

Fig 1: Identifying Cylinder Head Cover Remove/Install Components - Shown On Model 221.071

Courtesy of MERCEDES-BENZ USA

Shown on model 221.071 with code (487) Active Body Control (ABC) 

	Remove/install
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
1	Switch off ignition
2	Remove bottom engine compartment paneling	Install bottom engine compartment paneling only after engine test run.	AR61.20-P-1105SX
3	Drain coolant at radiator		AR20.00-P-1142SX
	Notes on coolant		AH20.00-N-2080-01A
4	Remove air filter housing		AR09.10-P-1150SX
5	Remove poly-V belt and poly-V belt tensioning device	Except model 221.095/195 with a twin belt drive	AR13.20-P-0001SX
	Version of the poly-V belt altered	Model 221.095/195	BT13.20-P-1000-01SXH
6	Remove three-disk thermostat valve		AR20.10-P-2460SX
7	Remove oil filter housing (1)		AR18.20-P-3471SX
8	Remove power steering expansion reservoir	Vehicles with AIRmatic except model 221.095/195	AR46.25-P-1000SX
9	Remove front cover (3) at left cylinder head		AR01.30-P-5700SX
10	Detach purge line (4) at separation point (arrow), unclip it from brackets at oil separator (5) and at feed line duct (6), and place it to the side
11	Remove fuel pressure via service valve on fuel distributor rail (8)		AR07.03-P-1460-01VA
		Engine 272	*BA07.03-P-1004-01B
			Fig 4
12	Detach fuel line (7) at fuel distributor rail (8)	Collect escaping fuel with absorbent rags and seal connections immediately using stop plugs.
			*BA07.03-P-1001-01B
			Figure
13	Remove ignition coils on left cylinder head		AR15.12-P-2003SX
14	Remove oil separator (5)		AR01.20-P-9750SX
15	Detach ground line (9) from cylinder head cover (10)		*BA01.30-P-1001-01O
16	Remove left rear engine lifting eye (11)		*BA01.30-P-1005-01O
			*BA15.18-P-1003-01B
17	Remove feed line duct (6) from cylinder head cover (10)		*BA15.18-P-1002-01B
18	From front rubber mount (12) from cylinder head cover (10)		*BA01.30-P-1011-01O
19	Remove heat shield from cylinder head cover (10)		*BA01.30-P-1017-01O
20	Loosen bolts for cylinder head cover (10) in reverse order of tightening procedure and remove them	Engine 272	AR01.20-P-5014-03VA
		Engine 273	AR01.20-P-5014-03SX
			*BA01.30-P-1004-01O
21	Pry off cylinder head cover (10) from cylinder head carefully	To avoid damaging sealing surfaces, do not pound in the prying tool between the cylinder head cover (10) and the cylinder head. Apply sealant to the cylinder head cover (10): ↓ Notes on cylinder head cover section sealant path (10)
		Engine 272	AH01.30-P-1000-08V
		Engine 273	AH01.30-P-1000-08SX
			Figure
		Loctite 5970 sealant	*BR00.45-Z-1013-01A
	Clean
22	Clean sealing surfaces at cylinder head and at cylinder head cover (10)	Do not use any sharp-edged tools or abrasive paper as this will damage the sealing surfaces.	AR01.00-P-0050-01A
		Loctite 7200	*BR00.45-Z-1038-04A
		Loctite 7063 cleaning spray (150 ml)	*BR00.45-Z-1046-04A
23	Install in the reverse order
	Checking
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
24	Carry out engine test run while checking engine for function and oil leaks

Fig 2: Identifying Squeeze Gun (112 589 00 25 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Set Of Stop Plugs (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Pressure Hose (119 589 04 63 00)

Courtesy of MERCEDES-BENZ USA