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

ENGINE 272.946/965/974/975 in MODEL 221 Right cylinder head cover

ENGINE 273.922/924/961/968 in MODEL 221 Right cylinder head cover

ENGINE 273.961/968 in MODEL 216 Right 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
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Switch off ignition
2	Remove air filter housing		AR09.10-P-1150SX
3	Remove bolts (1a) and remove bracket (1) for front engine cover with air pump switchover valve (Y32)		*BA01.30-P-1009-01O
4	Remove right air shutoff valve (2)		AR14.30-P-7200SX
5	Remove front cover (3) on the right cylinder head		AR01.30-P-5700SY
6	Remove ignition coils at right cylinder head		AR15.12-P-2003SX
7	Remove cover (4) on centrifuge		AR01.20-P-2100SX
8	Disconnect right connector (R) at ME-SFI [ME] control unit (N3/10)
9	Detach ME-SFI [ME] control unit (N3/10) from control unit brackets (5l, 5r) and lay to one side	Do not disconnect left connector (L) at ME-SFI [ME] control unit (N3/10).
10	Remove right control unit bracket (5r)		*BA07.08-P-1002-01A
11	Detach ground line (6) from cylinder head cover (7)		*BA01.30-P-1010-01O
12	Remove feed line duct (8) from resonance intake manifold (9), cylinder head cover (7) and rear right motor suspension lug (10) and place aside		*BA15.18-P-1001-01B
			*BA15.18-P-1002-01B
			*BA15.18-P-1003-01B
13	Loosen bolts for cylinder head cover (7) 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
14	Carefully pry off cylinder head cover (7) from cylinder head	To avoid damaging sealing surfaces, do not pound in the prying tool between the cylinder head cover (7) and the cylinder head. Apply sealant to cylinder head cover (7): ↓ Notes on application of sealant to the cylinder head cover (7):
		Engine 272	AH01.30-P-1000-08V
		Engine 273	AH01.30-P-1000-08SX
			Figure
		Loctite sealant 5970	*BR00.45-Z-1013-01A
	Clean
15	Clean sealing surfaces at cylinder head and at cylinder head cover (7)	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
		Cleaning spray, Loctite 7063 (150ml)	*BR00.45-Z-1046-04A
16	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
17	Carry out engine test run while checking engine for function and oil leaks

CYLINDER HEAD

Number	Designation				Engine 272	Engine 273
BA01.30-P-1004-01O	Bolt, cylinder head cover to cylinder head	M7	Stage 1	Nm	12	12
BA01.30-P-1004-01O	Bolt, cylinder head cover to cylinder head		Stage 2	∠°	90	90
BA01.30-P-1009-01O	Bolt, switchover valve bracket to cylinder head	M6		Nm	9	9
BA01.30-P-1010-01O	Bolt, ground line to cylinder head cover	M6		Nm	9	9

CONTROL UNIT

Number	Designation		Engine 272	Engine 273
BA07.08-P-1002-01A	Bolt, control unit bracket to resonance intake manifold	Nm	8	8

ENGINE WIRING HARNESS

Number	Designation		Engine 272	Engine 273
BA15.18-P-1001-01B	Bolt, feed duct to resonance intake manifold	Nm	8	8
BA15.18-P-1002-01B	Bolt, feed duct to cylinder head cover	Nm	8	8
BA15.18-P-1003-01B	Bolt, feed duct to engine lifting eye	Nm	8	8

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

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1013-01A	Loctite sealant 5970	A 003 989 98 20
BR00.45-Z-1038-04A	Loctite 7200	Henkel Loctite Deutschland GmbH
BR00.45-Z-1046-04A	Cleaning spray, Loctite 7063 (150ml)	A 001 986 71 71 10