Remove/install cylinder head

AR01.30-P-5800MRD

Remove/install cylinder head

18.02.2020

Engine

274.9 in model 213

Engine

274.9 in model 238

Modification notes

23.08.2019

Note added.

Operation step 14

29.03.2018

Special tool added.

Operation step 12

605 589 00 33 00

1

Cylinder head

8

Coolant line

8s

Screw

B11/4

Coolant temperature sensor

1

Cylinder head

9

Cap

10

Slide rail pins

11

Bolts

 Caution

Risk of injury to skin and eyes due to handling of engine oil. Risk of poisoning caused by swallowing engine oil

Wear protective gloves, protective clothing and safety glasses.
Do not fill engine oil into beverage containers.

AS18.00-Z-0001-01A

 Warning

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 pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Notes on threaded connections fastened using a tightening angle-based tightening process

AH00.00-P-0020-01A

 

Remove/install

1

Remove cylinder head cover.

AR01.20-P-5014MRD

 Installation: Only install upper engine cover and lower engine compartment paneling after the performing a leak test.

2

Remove charge-air distributor from cylinder head (1) and fasten outside the working area.

AR09.41-P-8683MRD

3

Remove exhaust gas turbocharger with exhaust manifold.

AR09.40-P-6036MRD

4

Remove exhaust gas recirculation.

Engine 274.9 in model 213
with code 920 (Direct petrol injection with stratified charging)
Engine 274.9 in model 238
with code 920 (Direct petrol injection with stratified charging)

AR14.20-P-1050MRD

5

Remove camshafts.

AR05.20-P-6992MRD

6

Remove camshaft bearing bridges from cylinder head (1).

7

Remove screw (8s) and place coolant line (8) to one side.

 M61

*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 of the coolant temperature sensor (B11/4).

10

Remove spark plugs.



AP15.10-P-1580CWF

11

Remove cap (9) from cylinder head (1).

 Installation: Replace cap (9).

12

Remove slide rail pins (10).



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

 Installation: Coat sliding rail bolt (10) with engine oil.

 Puller

*605589003300

 Spindle

*270589003302

13

Loosen cylinder head bolts in stages in reverse order of the 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 damage will occur on the cylinder head (1).

 Installation: 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

 Installation: 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-2013MRD

16

Remove coolant temperature sensor (B11/4).

When replacing the cylinder head (1).

AR15.60-P-2712MRD

17

Remove valve stem seals

When replacing the cylinder head (1).

AR05.30-P-3510MRD

18

Remove valves.

When replacing the cylinder head (1).

AR05.30-P-3511MRD



Clean

19

Clean sealing surfaces on cylinder head (1), timing case cover, and crankcase.

AR01.00-P-0050-01A


Do not use any sharp-edged tools or abrasive paper.
Sealing surfaces will otherwise be damaged.

Loctite 7200

*BR00.45-Z-1038-04A

Loctite 7063 (400 ml) cleaning spray

*BR00.45-Z-1046-04A

20

Cover threaded holes of the cylinder head bolts in the crankcase with rags and blow out with compressed air.



Check

21

Check sealing surfaces on cylinder head (1), timing case cover, and crankcase for cracks and unevenness.


Do not rework cylinder head (1) and crankcase (surface grinding).
The permissible production tolerances will otherwise be exceeded.

 Tightening the cylinder head bolts compensates a slight distortion of the cylinder head (1) in longitudinal or transverse direction.

If cracks or unevenness are present,



Replace cylinder head (1), timing case cover, and crankcase.

Crankcase
Engine 274.9 in model 213
except code M005 (Vehicles with 4MATIC/all-wheel drive)

AR01.10-P-2401MRD

Crankcase
Engine 274.9 in model 213
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AR01.10-P-2510MRD

Crankcase
Engine 274.9 in model 238
except code M005 (Vehicles with 4MATIC/all-wheel drive)

AR01.10-P-2401MRF

Crankcase
Engine 274.9 in model 238
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AR01.10-P-2510MRF

Timing case cover

AR01.40-P-8000MRD

22

Install in the reverse order.



Check

23

Check basic position of camshafts.

AR05.20-P-6010MRD

24

Change engine oil and oil filter element.



Engine 274.910 in model 213
Engine 274.920 in model 213
except code M005 (Vehicles with 4MATIC/all-wheel drive)
Engine 274.920 in model 238
except code M005 (Vehicles with 4MATIC/all-wheel drive)

AP18.00-P-0101CWI



Engine 274.920 in model 213
with code M005 (Vehicles with 4MATIC/all-wheel drive)
Engine 274.920 in model 238
with code M005 (Vehicles with 4MATIC/all-wheel drive)

AP18.00-P-0101CWE

 Warning

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 leak tightness and leak tightness.

26

Install lower engine compartment lining.

AR61.20-P-1105LWE

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

M61

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

Repair materials

Number

Designation

Order number

BR00.45-Z-1038-04A

Loctite 7200

Henkel AG & Co. KGaA
http://www.loctite.de

BR00.45-Z-1046-04A

Loctite 7063 (400 ml) cleaning spray

A 001 986 71 71 09