Remove/install camshaft positioner

AR05.20-S-7204EG

Remove/install camshaft positioner

03.02.2016

Model

447, 448 with engine 274

01a

Holding device

02a

Bracket

02e

Bracket

1

Camshaft positioner

2

Control valve

3

Timing chain

4

Camshaft

 Danger !

Risk of injury. Moving parts can pinch, crush or, in extreme cases even sever extremities.

No parts of the body or limbs should be within the operating range of the mechanism when moving components.

AS00.00-Z-0009-01A

 Danger !

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



Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A



Remove

1

Remove cylinder head cover

AR01.20-S-5014EG

2

Rotate engine at crankshaft center bolt in direction of engine rotation to ignition TDC on cylinder 1

 The TDC marking on the belt pulley must be aligned with the positioning edge on the timing case cover.

 Socket wrench bit

*001589650900

3

Remove chain tensioner

AR05.10-S-7800EG

4

Install holding device (01a)

 Holding device

*270589016100

5

Install holder (02a, 02e)


Before assembly of the bracket (02a, 02e), the camshafts (4) must be in the TDC position so that the brackets (02a, 02e) can be put in place and installed without further pressure.
This prevents damage occurring.


The camshafts (4) may exclusively be turned using the socket or with the screw/bolt (N 000000 005561) in combination with the disk ( 604 990 00 40).
This prevents damage to the camshafts (4).

 Socket

*270589010700

 Holding device

*270589016100

6

Remove control valves (2) of camshaft positioner (1)

 Socket

*271589001000

7

Remove camshaft positioner (1)

 To do this remove camshaft positioner (1) from the camshafts (4) and unhook timing chain (3). Secure timing chain (3) to prevent it from falling down.



Install

8

Install camshaft positioner (1) with laid on timing chain (3)

 When installing the camshaft positioner (1) or the timing chain (3), ensure that the crankshaft does not turn.

9

Install control valves (2) of camshaft positioner (1)

 The thread and bolt head contact surface for the control valves (2) must be oiled.

10

Screw in control valves (2) and allows to touch

 Tightening of the control valves (2) first take place after installation of the chain tensioner.

11

Install chain tensioner

AR05.10-S-7800EG

12

Tighten down control valve (2)

 Tighten both control valves (2) evenly without discontinuity with torque.

 Center valve, pulse wheel or camshaft adjuster to camshaft

*BA05.20-N-1005-02C

13

Remove holding device (01a)

 Holding device

*270589016100



Check

14

Check basic position of camshafts (4)

AR05.20-S-6010EG

If the basic position is not correct



Set basic position of camshafts

AR05.20-S-6020EG



Install

15

Install cylinder head cover

AR01.20-S-5014EG



Check

 Danger !

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

16

Check for leaktightness with engine running

 Visual inspection only.

 Camshaft, camshaft adjustment

Number

Designation

Engine 274 in model 447, 448

BA05.20-N-1005-02C

Center valve, pulse wheel or camshaft adjuster to camshaft

Stage 1

Nm

18

Stage 2

°

40