Remove/install camshaft positioner

AR05.20-D-7204TSC

Remove/install camshaft positioner

05.10.2018

Engine

274 in model 907

01a

Holding device

02a

Bracket

02e

Bracket

1

Camshaft positioner

2

Control valve

3

Timing chain

4

Camshafts

05

TDC marking

06

Positioning edge on the timing case cover

5

Telescope mirror

 Warning

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 area of mechanical components when moving components.

AS00.00-Z-0009-01A

 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

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A



Remove

1

Remove cylinder head cover.

AR01.20-D-5014TSC

2

Rotate the engine at crankshaft center bolt in direction of engine rotation with the aid of a telescope mirror (5) to ignition TDC on cylinder 1.

 The TDC marking (05) on the belt pulley must align with the positioning edge on the timing case cover (06).

 Commercially available devices/tools
Telescope mirror (5)

 Socket wrench bit

*001589650900

3

Remove the chain tensioner.

AR05.10-D-7800TSC

4

Install holding device (01a).

 Holding device

*270589016100

5

Install the brackets (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 the camshaft positioners (1).

 Socket

*271589001000

7

Unhook timing chain (3), remove the camshaft positioners (1) from the camshafts (4) and secure timing chain (3) against falling down.



Install

8

Install the camshaft positioners (1) with laid on timing chain (3).



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

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

9

Screw in control valves (2) all the way.



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

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

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

10

Install the chain tensioner.

AR05.10-D-7800TSC

11

Screw control valves (2) in tight.

Topical note

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

AH00.00-P-0020-01A

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

 Center valve, pulse wheel or camshaft adjuster to camshaft

*BA05.20-N-1005-02C

12

Remove holding device (01a).

 Holding device

*270589016100



Check

13

Check basic position of camshafts (4).

AR05.20-D-6010TSC

If the basic position of the camshafts (4) is incorrect,



adjust basic position of camshafts (4).

AR05.20-D-6020TSC



Install

14

Install cylinder head cover.

AR01.20-D-5014TSC



Check

 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

 Warning

Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.

Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.

AS49.00-Z-0001-01A

15

Carry out engine test run and check engine for proper leaktightness and leaktightness.

 Camshaft, camshaft adjustment

Number

Designation

Engine 274 in model 907

BA05.20-N-1005-02C

Center valve, pulse wheel or camshaft adjuster to camshaft

Stage 1

Nm

18

Stage 2

°

40