Remove/install cylinder head - AR01.30-P-5800SY

ENGINES 272.946/965/974/975 in MODEL 221 Right cylinder head 

ENGINES 273.922/924/961/968 in MODEL 221 Right cylinder head 

ENGINES 273.961/968 in MODEL 216 Right cylinder head 

Fig 1: Identifying Cylinder Head Remove/Install Components

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Cylinder Head Remove/Install Components - Shown On Vehicle With Code (487)

Courtesy of MERCEDES-BENZ USA

Shown on vehicle 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	Detach ground line(s) from battery/batteries	Insulate clamping device of the ground line in order to prevent inadvertent contact with the ground point of the battery.	AR54.10-P-0003SX
	Notes on battery		AH54.10-P-0001-01A
3	Remove bottom engine compartment paneling	Only install bottom engine compartment paneling after leak test.	AR61.20-P-1105SX
4	Drain coolant at radiator and at cylinder crankcase (1)		AR20.00-P-1142SX
	Notes on coolant		AH20.00-N-2080-01A
5	Detach right catalytic converter (2) from exhaust manifold		*BA49.10-P-1001-01Z
6	Remove air filter housing		AR09.10-P-1150SX
7	Remove ME-SFI [ME] control unit (N3/10)		AR07.08-P-7008SX
8	Remove electrical air pump (M33) with bracket		AR14.30-P-7251SX
9	Remove air shutoff valve (4) at right cylinder head (5)		AR14.30-P-7200SX
10	Remove poly-V belt (8) and upper guide pulley (9)	Except model 221.095/195 with two-belt drive	AR13.20-P-0001SX
	Poly-V belt version changed	Model 221.095/195	BT13.20-P-1000-01SXH
11	Remove oil dipstick guide tube (12)	Vehicles without 4MATIC	AR18.40-P-3510SX
12	Remove front cover (6) at right cylinder head (5)	After fitting front cover (6) check position of camshafts is at a 55° crankshaft angle after top dead center (TDC), see: ↓	AR01.30-P-5700SY
		Check basic position of camshafts.	AR05.20-P-6010SX
			Figure
13	Remove ignition coils at right cylinder head		AR15.12-P-2003SX
14	Remove resonance intake manifold (3)		AR09.20-P-1961SX
15	Remove right cylinder head cover (7)		AR01.20-P-5014SY
16	Rotate engine at crankshaft center bolt in direction of rotation of the engine to a 40° crankshaft angle after top dead center (TDC)	Pay attention to position of camshafts.	AR05.20-P-6010-01VB
			Figure
17	Remove chain tensioner	Install new 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-7800SX
18	Remove both camshaft adjusters (10) at right cylinder head (5)	Intake camshaft	AR05.20-P-7201SX
		Exhaust camshaft	AR05.20-P-7201SY
19	Remove slide rail bolts (11g) and tensioning rail bolts (11s) from right cylinder head (5)	Coat slide rail bolts (11g) and tensioning rail bolts (11s) with sealant before insertion.	AR01.30-P-5800-04V
			Figure
			Figure
			Figure
		Loctite 5970 sealant	*BR00.45-Z-1013-01A
20	Loosen cylinder head bolts in stages in reverse order of tightening procedure and remove them	To avoid stresses in cylinder head (5), cylinder head bolts must only be loosened when the engine has cooled off. Tightening procedure:
		Engine 272	AR01.30-P-5800-07VA
		Engine 273 The cylinder head bolt (13) cannot be removed. To be able to handle cylinder head (5) more easily, raise cylinder head bolt (13) and fix it with a cable tie (14).	AR01.30-P-5800-07SX
			*BA01.30-P-1003-01O
			*BA01.30-P-1016-01O
21	Remove RH cylinder head (5) from cylinder crankcase (1)	Place new cylinder head gasket (15) on crankcase (1). Pay attention to the fitted sleeves for fixing the cylinder head (5). Before fitting, insert cylinder head bolt (13) in cylinder head (5) and fix it in place with a cable tie (14).
	Notes on application of sealant to cylinder head gasket (15)		AH01.30-P-1000-04RX
	Clean
22	Clean sealing surfaces at RH cylinder head (5), cylinder crankcase (1) and timing case cover	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	Blow out the tapped holes for cylinder head bolts in crankcase (1) with compressed air, and clean off the engine oil and the coolant
	Checking
24	Check cylinder head bolts and replace if required		AR01.30-P-5800-03VA
		Cylinder head bolt	*BE01.30-P-1001-04B
25	Check the sealing surfaces at RH cylinder head (5), cylinder crankcase (1) and timing case cover for cracks and unevenness	Cylinder head (5) and cylinder crankcase (1) must not be reworked (surface grinding). Otherwise the permissible production tolerances will be exceeded. In the event of any complaint, replace cylinder head (5), timing case cover or cylinder crankcase (1). Possible warping of the cylinder head (5) in the longitudinal or transverse direction is compensated for again when reassembled by tightening the cylinder head bolts.
26	Install in the reverse order
27	Change engine oil and oil filter element
	Engine - oil and filter change		AP18.00-P-0101SX
	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
28	Carry out an engine test run, and check engine and fuel system for leaks

Fig 3: Identifying Impact Extractor (116 589 20 33 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Threaded Stud (116 589 01 34 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Squeeze Gun (112 589 00 25 00)

Courtesy of MERCEDES-BENZ USA

Fig 6: Identifying Wrench Socket (001 589 65 09 00)

Courtesy of MERCEDES-BENZ USA