Remove/install camshaft adjusters

AR05.20-P-7201TS

Remove/install camshaft adjusters

28.11.11

 

Remove/install

1

Turn key in ignition lock to position "0"

2

Remove air filter housing

AR09.10-P-1150TS

3

Remove chain tensioner

M241.5

AR05.10-P-7800TS

M221.5

AR05.10-P-7800VB

 In case of engine 272, both chain tensioners can be removed whereby for engine 273 only chain tensioner with thread M221.5 is installed.

 Installation: Install new chain tensioner with thread of M221.5. 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.

Right-hand side

4

Remove camshaft adjuster for right exhaust camshaft (1)

AR05.20-P-7201TT

5

Remove cap (26)

6

Detach center valve (7)

 Installation: Tightening of center valve (7) may only take place for a removed chain tensioner. Malfunctions of camshaft adjustment can occur otherwise.

 Observe loosening direction.

AR05.20-P-7201-06VA



*BA05.20-P-1009-02A

7

Remove right cylinder head cover

Model 211 except 211.057/ 257, 219 except 219.357

AR01.20-P-5014TT

Model 211.057/ 257, 219.357

AR01.20-P-5014TY

8

Mark timing chain relative to camshaft adjuster (15) using color codes (25)

 Engine positioned at 40° crankshaft angle after ignition TDC.

 Installation: Check position of intake camshaft (3) based on color coding (25).

9

Remove tensioning rail (24)

AR05.10-P-8127TT

10

Remove center valve (7) and pulse wheel (11)

 Check dowel pin (18) and pin (19). If a 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 the contact surface with the pulse wheel (11) before assembly.

 Installation: Align dowel pin (18) for pulse wheel (11) with fitted bore (20) in camshaft adjuster (15).

11

Remove timing chain from camshaft adjuster (15) and detach camshaft adjuster (15) forwards from intake camshaft (3)

 Installation: Lubricate contact surfaces to intake camshaft (3) and camshaft 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 the camshaft adjuster (15) with fitted bore (22) in intake camshaft (3).

Left-hand side

12

Remove camshaft adjuster for the left exhaust camshaft (2)

AR05.20-P-7201TT

13

Remove cap (27)

14

Detach center valve (8)

 Installation: Tightening of center valve (8) may only take place for a removed chain tensioner. Malfunctions of camshaft adjustment can occur otherwise.

 Observe loosening direction.

AR05.20-P-7201-06VA



*BA05.20-P-1009-02A

15

Remove left cylinder head cover

Model 211 except 211.057/ 257, 219 except 219.357

AR01.20-P-5014TS

Model 211.057/ 257, 219.357

AR01.20-P-5014TX

16

Mark timing chain relative to the camshaft adjuster (16) using color codes (25)

 Engine positioned at 40° crankshaft angle after ignition TDC.

 Installation: Check position of intake camshaft (4) based on color coding (25).

17

Remove center valve (8) and pulse wheel (12)

 Check dowel pin (18) and pin (19). If a 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 the contact surface with the pulse wheel (12) before assembly.

 Installation: Align dowel pin (18) for pulse wheel (12) with fitted bore (20) in camshaft adjuster (16).

18

Remove timing chain from camshaft adjuster (16) and detach camshaft adjuster (16) towards the front from intake camshaft (4)

 Installation: Lubricate contact surfaces to intake camshaft (4) and camshaft adjuster (16) before the mounting camshaft adjuster (16).

 Installation: Align color coding (25) on camshaft adjuster (16) and timing chain with each other. Align dowel pin (21) in camshaft adjuster (16) with fitted bore (22) in intake camshaft (4).

19

Install in the reverse order



Checking

 Danger!

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

20

Conduct engine test run and check engine for leaks

Number

Designation

Engine
272

Engine
273

BA05.20-P-1009-02A

Center valve for pulse wheel/camshaft adjuster to camshaft

Nm

145

145