Remove/install the cylinder head - AR01.30-P-5770EW

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ENGINES 272, 273 in MODEL 212

Fig 1: Cylinder Head Remove/Install Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Cylinder Head Remove/Install Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

8.2.11	Value changed: screw/bolt, cylinder head to timing case		*BA01.30-P-1003-01O
	Value changed: screw/bolt, cylinder head to crankcase		*BA01.30-P-1016-01O

	Remove/install
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Turn key in ignition lock to position "0"
2	Detach ground line from battery		AR54.10-P-0003EW
	Notes on battery		AH54.10-P-0001-01A
3	Remove bottom engine compartment paneling	Only install bottom engine compartment paneling after engine test run.	AR61.20-P-1105EW
4	Drain coolant at radiator and at cylinder crankcase (1)		AR20.00-P-1142EWS
	Notes on coolant		AH20.00-N-2080-01A
5	Detach left catalytic converter (2) from exhaust manifold		*BA49.10-P-1001-01AE
6	Remove air filter housing		AR09.10-P-1150EWS
7	Remove ME-SFI [ME] control unit (N3/10) Except model 212.057	Engine 272, 273 in model 212	AR07.08-P-7008EW
7		Engine 272.983 in model 212	AR07.08-P-7008EWD
8	Remove poly-V belt (3) and poly-V belt tensioning device		AR13.20-P-0001EWS
9	Remove expansion reservoir (4)		AR46.25-P-1000EWL
10	Remove oil filter housing (5) with oil-water heat exchanger		AR18.20-P-3471EW
11	Remove front cover (6) at left cylinder head (7)	After fitting front cover (6) check position of camshafts is at a 55° crankshaft angle before ignition TDC:	AR01.30-P-5700EWL
		See "Check basic position of camshafts".	AR05.20-P-6010EW
			Fig 3
12	Remove ignition coils at left cylinder head (7)		AR15.12-P-2003EW
13	Remove oil separator (8)		AR01.20-P-9750EWS
14	Remove resonance intake manifold (10)	Except model 212.057	AR09.20-P-1961EW
14	Remove resonance intake manifold (10)	Model 212.057	AR09.20-P-1961EWD
15	Remove left cylinder head cover (9)	Except model 212.057	AR01.20-P-5013EL
15	Remove left cylinder head cover (9)	Model 212.057	AR01.20-P-5013ELD
16	Remove alternator		AR15.40-P-5032EW
17	Rotate engine at crankshaft center bolt in direction of engine rotation to a 40° crankshaft angle after ignition TDC	Pay attention to position of camshafts.	AR05.20-P-6010-01VB
17			Fig 3
18	Remove chain tensioner	The previously installed chain tensioner must not be reinstalled because, during removal, its pressure pin is pressed into the end position. The thrust pin latch prevents this return stroke. This would overstretch the timing chain on reinstalling.	AR05.10-P-7800EW
19	Remove both camshaft adjuster (11) at left cylinder head (7)	Intake camshaft	AR05.20-P-7201EWE
19		Exhaust camshaft	AR05.20-P-7201EWA
20	Remove air shutoff valve (12) at left cylinder head (7)	Except model 212.057	AR14.30-P-7200EW
21	Remove intermediate flange (12a) of air shutoff valve (12)	Except model 212.057
21	Remove intermediate flange (12a) of air shutoff valve (12)		*BA14.30-P-1004-02A
22	Detach coolant hose (13) from heater valve
23	Disconnect electrical connector on coolant temperature sensor (B11/4)
24	Pull out slide rail pins (14) from left cylinder head (7)	Apply sealant to slide rail pins (14) before inserting them.	AR01.30-P-5800-04V
			Fig 4
			Figure
			Figure
		Loctite 5970 sealant	*BR00.45-Z-1013-01A
25	Loosen cylinder head bolts in stages in reverse order of tightening procedure and remove them	To avoid stresses in cylinder head (7), cylinder head bolts must only be loosened when engine has cooled off: Tightening procedure for cylinder head bolts:
		Engine 272	AR01.30-P-5800-07VA
		Engine 273	AR01.30-P-5800-07SX
			*BA01.30-P-1003-01O
			*BA01.30-P-1016-01O
26	Remove LH cylinder head (7) from cylinder crankcase (1)	Place new cylinder head gasket (15) on cylinder crankcase (1). Pay attention to fitted sleeves for fixing cylinder head (7).
	Information on applying sealant to cylinder head gasket		AH01.30-P-1000-04RX
	Clean
27	Clean sealing surfaces on LH cylinder head (7), timing case cover and cylinder crankcase (1)	Do not use any sharp-edged tools or abrasive paper. The sealing surfaces will be damaged otherwise.	AR01.00-P-0050-01A
		Blow out threaded holes of cylinder head bolts in cylinder crankcase (1) with compressed air and clean off engine oil and coolant.
		Loctite 7200	*BR00.45-Z-1038-04A
		Loctite 7063 cleaning spray (150 ml)	*BR00.45-Z-1046-04A
	Checking
28	Check cylinder head bolts and replace if required		AR01.30-P-5800-03VA
		Cylinder head bolt	*BE01.30-P-1001-04B
29	Check sealing surfaces on LH cylinder head (7), timing case cover and cylinder crankcase (1) for cracks and unevenness	The cylinder head (7) and cylinder crankcase (1) must not be post-worked (surface grinding). The permissible machining tolerances will be exceeded otherwise. In the event of any complaint, replace cylinder head (7), timing case cover or cylinder crankcase (1). Any distortion of the cylinder head (7) occurring in the longitudinal or transverse direction will be balanced out again during reassembly through tightening of the cylinder head bolts.
30	Install in the reverse order
31	Change engine oil and oil filter element
	Engine oil and filter change		AP18.00-P-0101EW
	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
32	Carry out an engine test run, and check engine and fuel system for leaks
33	Inspecting cooling system for leaks		AR20.00-P-1010EW

CYLINDER HEAD/CYLINDER HEAD BOLTS

Number	Designation			Engine 272	Engine 273
BE01.30-P-1001-04B	Cylinder head bolt	Thread diameter	M	11	11
		Length (L) when new	mm	170	170
		Length (L)	mm	172	172
		-		-	-

EXHAUST SYSTEM

Number	Designation		Engine 156, 157, 271, 272, 273, 276, 278 in model 212
BA49.10-P-1001-01AE	Screw/bolt, catalytic converter to exhaust manifold	Nm	20

AIR SHUTOFF VALVE

Number	Designation		Engine 272	Engine 273
BA14.30-P-1004-02A	Screw/bolt, left air shutoff valve intermediate flange to cylinder head	Nm	14	14

CYLINDER HEAD

Number	Designation				Engine 272	Engine 273
BA01.30-P-1003-01O	Cylinder head bolt on timing case	M8		Nm	20	20
BA01.30-P-1016-01O	Screw/bolt, cylinder head to crankcase	M11	Stage 1	Nm	20	20
			Stage 2	Nm	50	50
			Stage 3	∠°	90	90
			Stage 4	∠°	90	90

Fig 3: Identifying Wrench Socket (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Impact Extractor (116 589 20 33 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Threaded Stud (116 589 01 34 00)

Courtesy of MERCEDES-BENZ USA

Fig 6: 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 5970 sealant	A 003 989 98 20
BR00.45-Z-1038-04A	Loctite 7200	Henkel Loctite Deutschland GmbH
BR00.45-Z-1046-04A	Loctite 7063 cleaning spray (150 ml)	A 001 986 71 71 10