Mercedes-Benz: engine M272, M273. Service manual - part 2

 

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Mercedes-Benz: engine M272, M273. Service manual - part 2

 

 

7

Remove spark plugs (R4) from the cylinder 

Installation: It is essential to adhere to 

 

heads using spark plug wrench (01)

the tightening torque as it influences the 
position of the spark plug electrodes in the 
cylinder. 
An incorrect tightening torque causes 
misfires which can lead to damage to the 
engine and catalytic converter damage

*BA15.10-P-1001-01C

  Spark plug to cylinder head

*112589010900

  Motor 272, 273

Spark plug wrench

*278589000900

  Motor 157, 276, 278

Spark plug wrench

8

Install in the reverse order

  Spark plugs

Number

Designation

ENGINE 157

ENGINE 272

BA15.10-P-1001-01C

Spark plug to cylinder head

Nm

23

23

  Spark plugs

Number

Designation

ENGINE 273

ENGINE 276

BA15.10-P-1001-01C

Spark plug to cylinder head

Nm

23

23

  Spark plugs

Number

Designation

ENGINE 278

BA15.10-P-1001-01C

Spark plug to cylinder head

Nm

23

272 589 01 33 00

112 589 01 09 00

278 589 00 09 00

Puller

Spark plug wrench

Spark plug wrench

Страница 2 из 2

© Daimler AG, 07.04.13, G/07/14, ap15.10-p-1580ew, Replace spark plugs
ENGINE 157, 272, 273, 276, 278 in MODEL 212 ENGINE 157, 276, 278 in MODEL 218 ENGINE 272, 273, 276, 278 in MODEL 207

AR05.20-P-6992EW

Remove/install camshafts

22.9.10

ENGINES  272, 273 in MODEL 212

1

Camshaft adjuster for intake camshaft

2

Auxiliary bearing cap of intake 
camshaft

3

Intake camshaft

4

Auxiliary bearing cap of exhaust 
camshaft

5

Exhaust camshaft

P05.20-2270-06

Remove/install

 

 

The ground line on the battery must  always Model 212.057

 

 

be detached before beginning work on the 
fuel system otherwise pressure will be lost in 
the fuel system through opening a vehicle 
door or the trunk lid

Remove intake camshafts

1

Remove respective camshaft adjusters (1)

AR05.20-P-7201EWE

2

Remove auxiliary bearing cap (2) and intake 

*BA05.20-P-1010-02A

camshaft (3)

Remove exhaust camshafts

3

Remove respective camshaft adjusters

AR05.20-P-7201EWA

4

Remove respective cylinder head cover

Right cylinder head cover, except model 

AR01.20-P-5012EL

212.057
Right cylinder head cover, model 212.057

AR01.20-P-5012ELD

Left cylinder head cover, except model 

AR01.20-P-5013EL

212.057
Left cylinder head cover, model 212.057

AR01.20-P-5013ELD

5

Take off auxiliary bearing cap (4) and 

*BA05.20-P-1010-02A

remove exhaust camshaft (5)

6

Install in the reverse order
Risk of accident

Secure vehicle to prevent it from moving by 

Danger!

 caused by vehicle starting 

AS00.00-Z-0005-01A

 

off by itself when engine is running.  Risk of  itself.
injury

Wear closed and snug-fitting work clothes.

 caused by contusions and burns 

during starting procedure or when working 

Do not touch hot or rotating parts.

near the engine as it is running

7

Conduct engine test run and check engine 
for leaks

Camshaft, camshaft adjustment

 

Number

Designation

Engine

Engine

272

273

BA05.20-P-1010-02A

Bolt, auxiliary bearing cap to cylinder  Stage 1

Nm

8

8

head

°

Stage 2

-

-

Страница 1 из 1

© Daimler AG, 07.04.13, G/07/14, ar05.20-p-6992ew, Remove/install camshafts
ENGINES 272, 273 in MODEL 212

AR05.20-P-7201EWE

Remove/install camshaft adjusters

28.11.11

ENGINES  272, 273 in MODEL 212
On intake camshafts

P05.20-2246-09

1, 2

Exhaust camshaft

11, 12 Pulse wheel for intake camshaft

24

Tensioning rail

3, 4

Intake camshaft

15, 16 Camshaft adjuster for intake 

25

Color coding

camshaft

7, 8

Center valve of intake camshaft

26, 27 Cap

15

Camshaft adjuster for intake camshaft

18

Dowel pin

19

Pin

20

Bore in camshaft adjuster

P05.20-2248-04

21

Dowel pin in camshaft adjuster

22

Fitted bore for intake camshaft

P05.20-2249-10

Remove/install

 

 

The ground line on the battery must  always Type 212.057

 

 

be detached before beginning work on the 
fuel system otherwise pressure will be lost in 
the fuel system through opening a vehicle 
door or the trunk lid

1

Remove air filter housing

AR09.10-P-1150EWS

Страница 1 из 3

© Daimler AG, 07.04.13, G/07/14, ar05.20-p-7201ewe, Remove/install camshaft adjusters
ENGINES 272, 273 in MODEL 212 On intake camshafts

2

Remove chain tensioner

AR05.10-P-7800EW

Installation: 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.

Removal on right cylinder head

3

Remove camshaft adjuster for right exhaust 

AR05.20-P-7201EWA

camshaft (1)

4

Remove cap (26)

5

Detach center valve (7)

AR05.20-P-7201-06VA

 Observe loosening direction.

Installation:

 

 The center valve (7) 

may only be tightened when chain tensioner 
is removed, otherwise this can lead to 
malfunctioning of camshaft adjustment.

*BA05.20-P-1009-02A

6

Remove right cylinder head cover

Except model 212.057

AR01.20-P-5012EL

Type 212.057

AR01.20-P-5012ELD

7

Mark timing chain relative to the camshaft 

 Engine positioned at 40° crankshaft angle 

adjuster (15) using color codes (25) 

after ignition TDC.

Installation:

 

 Check position of intake 

camshaft (3) based on color coding (25).

8

Remove tensioning rail (24)

AR05.10-P-8127EW

9

Remove center valve (7) and pulse wheel 

 Check dowel pin (18) and pin (19). If a 

(11)

dowel pin (18) or pin (19) is sheared off then 
this must be removed from camshaft 
adjuster (15).

Installation: Always replace pulse wheel 

 

(11). When tightening center valve (7) there 
is a risk that dowel pin (18) or pin (19) may 
shear off at pulse wheel (11).

Installation:

 

 Lubricate center valve (7) at 

contact surface with pulse wheel (11) before 
assembly.

Installation:

 

 Align dowel pin (18) on 

pulse wheel (11) with bore (20) in camshaft 
adjuster (15).

10

Lift timing chain and pull off camshaft 

Installation:

 

 Lubricate contact surfaces 

adjuster (15) from intake camshaft (3) 

to intake camshaft (3) and camshaft 

towards the front

adjuster (15) before mounting camshaft 
adjuster (15). 

Installation:

 

 Align color coding (25) on 

camshaft adjuster (15) and timing chain with 
each other. Align dowel pin (21) in camshaft 
adjuster (15) with fitted bore (22) in intake 
camshaft (3).

Removal on left cylinder head

11

Remove camshaft adjuster for exhaust 

AR05.20-P-7201EWA

camshaft (2)

12

Remove cap (27)

13

Detach center valve (8)

AR05.20-P-7201-06VA

 Observe loosening direction.

Installation:

 

 Tightening of center valve 

(8) may only take place for a removed chain 
tensioner. Malfunctions of camshaft 
adjustment can occur otherwise.

*BA05.20-P-1009-02A

14

Remove cylinder head cover

Except model 212.057

AR01.20-P-5013EL

Type 212.057

AR01.20-P-5013ELD

15

Mark timing chain relative to camshaft 

 Engine positioned at 40° crankshaft angle 

adjuster (16) using color codes (25) 

after ignition TDC.

Installation:

 

 Check position of intake 

camshaft (4) based on color coding (25).

16

Remove center valve (8) and pulse wheel 

 Check dowel pin (18) and pin (19). If a 

(12)

dowel pin (18) or pin (19) is sheared off then 
this must be removed from camshaft 
adjuster (16).

Installation: Always replace pulse wheel 

 

(12). When tightening center valve (8) there 
is a risk that dowel pin (18) or pin (19) may 
shear off at pulse wheel (12).

Installation:

 

 Lubricate center valve (8) at 

contact surface with pulse wheel (12) before 
assembly.

Страница 2 из 3

© Daimler AG, 07.04.13, G/07/14, ar05.20-p-7201ewe, Remove/install camshaft adjusters
ENGINES 272, 273 in MODEL 212 On intake camshafts

 

 

 

 

 

 

 

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