Remove/Install Cylinder Head - AR01.30-P-5800MRB

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Engine 274.9 in model 205

Engine 274.9 in model 253

MODIFICATION NOTES

25.03.2021	Check relevant sealing surfaces of Engine for unevenness score marks, etc.	Operation step 21.
11.05.2021	Information added.	Operation step 19.

Courtesy of MERCEDES-BENZ USA

Fig 1: Cylinder Head Components Location - Engine 274.9 In Model 253

Courtesy of MERCEDES-BENZ USA

	Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
	Risk of injury caused by scraping or cutting	Always wear protective gloves when working	AS00.00-Z-0017-01A
	body parts on sharp vehicle parts	on or near sharp and non-deburred vehicle parts. Deburr repair panels.
	Risk of injury to skin and eyes due to	Wear protective gloves, protective clothing	AS18.00-Z-0001-01A
	handling of Engine oil. Risk of poisoning caused by swallowing Engine oil	and safety glasses. Do not fill Engine oil into beverage containers.
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Notes on coolant		AH20.00-P-2080-01KOA
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Notice	Notes on threaded connections fastened using a tightening angle-based tightening process		AH00.00-P-0020-01A
Notice	Notes on threaded connections with aluminum screws/bolts		AH00.00-P-0006-01RM
	General information on work on gasoline direct injection system		AH07.00-P-2000-01A
	Remove/install
1	Remove cylinder head cover.	Only install upper Engine cover and lower Engine compartment paneling after the performing a leak test.	AR01.20-P-5014MRA
2	Remove charge-air distributor from cylinder head (1) and fasten outside of working area.		AR09.41-P-8683MRA
3	Remove exhaust gas turbocharger with exhaust manifold.		AR09.40-P-6025MRA
4	Remove exhaust gas recirculation.	Engine 274.9 in model 205 with code 920 (Direct fuel injection with stratified charging) except code 494 (US version)	AR14.20-P-1050MRA
5	Remove camshafts.		AR05.20-P-6992MRA
6	Remove camshaft bearing bridges from cylinder head (1).
7	Remove screw (8s) and place coolant line (8) to one side.	M6X1	*BA00.10-P-1002-04A
8	Remove screws (11).	Screw, coolant line to coolant pipe/cylinder head/crankcase/coolant thermostat/coolant hose/timing case	*BA20.10-P-1008-01AC
9	Release and disconnect electrical connector o coolant temperature sensor (B11/4).
10	Remove spark plugs.
			AP15.10-P-1580CWF
11	Remove caps (9) from cylinder head (1).	Replace cap (9).
12	Remove slide rail pins (10).
	Specified Engine oils for Cars, Vans (service) - Overview	Coat sliding rail bolt (10) with Engine oil.	BB00.40-P-0223-02A
		Puller	Fig 3
		Spindle	Fig 2
13	Loosen cylinder head bolts in stages in reverse order of tightening procedure and remove them.	Tightening procedure for cylinder head bolts	AR01.30-P-5800-01MR
		Only loosen the cylinder head bolts for a cooled off engine. Otherwise the cylinder head will be damaged (1).
		Replace cylinder head bolts. Pay attention to tightening procedure of the cylinder head bolts.
		Bolt, cylinder head to timing case cover	*BA01.30-P-1002-01Y
		Bolt, cylinder head to crankcase	*BA01.30-P-1001-01Y
14	Remove cylinder head (1). General information on checking valves, valve seats and valve guides		AH05.30-P-1000-02SZ
		Fit a new cylinder head gasket on the crankcase. Pay attention to the pilot bushing for fixing the cylinder head (1) in place.
15	Remove hydraulic compensating elements.	When replacing the cylinder head (1).	AR05.00-P-2011MRA
16	Remove coolant temperature sensor (B11/4).	When replacing the cylinder head (1).	AR15.60-P-2711MRA
17	Remove valves.	When replacing the cylinder head (1).	AR05.30-P-3511MRA
18	Remove valve springs and valve stem seals.	When replacing the cylinder head (1).	AR05.30-P-3500MRA
	Clean
19	Clean sealing surfaces of cylinder head (1), timing case cover, and crankcase.	Do not use any sharp-edged tools or abrasive paper. Sealing surfaces can otherwise be damaged, Engine and environmental damage can as a result occur. The machining and/or cleaning of sealing surfaces via spot grinding with abrasive paper or other abrasive materials to remove seal residues are not permitted. Even the smallest quantities of aluminum oxide, grinding particles and abrasion that enter the Engine oil chamber, the bearing points or the combustion chambers lead to damage and thus to Engine damage. The sealing surfaces must feel even after treatment. The sealing surface do not have to be metallic bright, thin layers of firmly adhering silicone sealant can remain. Solely cleaning with the approved adhesive and sealant remover is permitted. Observe processing information from manufacturer.	AR01.00-P-0050-01A
		Loctite 7200	*BR00.45-Z-1038-04A
		Loctite 7063 (400 ml) cleaning spray	*BR00.45-Z-1046-04A
20	Cover threaded holes of cylinder head bolts in crankcase with rags and blow out with compressed air.
	Check
21	Check sealing surfaces of cylinder head (1), timing case cover, and crankcase for cracks and unevenness.	The tightening of the cylinder head bolts offsets a slight distortion of cylinder head (1) in the longitudinal or transverse direction. Check relevant sealing surfaces of Engine for unevenness, score marks, etc. If unevenness, score marks, etc. are present, ↓ Replace affected component.
22	Install in the reverse order.
	Check
23	Check basic position of camshafts.		AR05.20-P-6010MRA
24	Change Engine oil and oil filter element.
		Engine 274.910 in model 205 Engine 274.920 in model 205 except code M005 (Vehicles with 4MATIC/all-wheel drive) Engine 274.920 in model 253 except code M005 (Vehicles with 4MATIC/all-wheel drive)	AP18.00-P-0101CWI
		Engine 274.920 in model 205 with code M005 (Vehicles with 4MATIC/all-wheel drive) Engine 274.920 in model 253 with code M005 (Vehicles with 4MATIC/all-wheel drive)	AP18.00-P-0101CWE
	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
25	Carry out Engine test run and check Engine for proper operation and leak tightness.
26	Install lower Engine compartment lining.		AR61.20-P-1105LW
27	Install upper Engine cover.

METRIC SCREWS/BOLTS AND NUTS AS PER MBN 10 105, 10 143

Number	Designation		8.8	10.9
BA00.10-P-1002-04A	M6X1	Nm	9	13

CYLINDER HEAD

Number	Designation				Engine 274
BA01.30-P-1001-01Y	Bolt, cylinder head to crankcase	M11	Stage 1	Nm	10
			Stage 2	Nm	40
			Stage 3	∠°	90
			Stage 4	∠°	90
			Stage 5	∠°	90

CYLINDER HEAD

Number	Designation			Engine 274
BA01.30-P-1002-01Y	Bolt, cylinder head to timing case cover	M8	Nm	20

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation			Engine 274
BA20.10-P-1008-01AC	Screw, coolant line to coolant pipe/cylinder head/crankcase/coolant thermostat/coolant hose/timing case	M6	Nm	9

Fig 2: Identifying Spindle (270 589 00 33 02)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Puller (605 589 00 33 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1038-04A	Loctite 7200	A 010 989 90 71
BR00.45-Z-1046-04A	Loctite 7063 (400 ml) cleaning spray	A 001 986 71 71 09