Set basic position of camshafts

AR05.20-P-6020MT

Set basic position of camshafts

18.02.2020

Engine

133 in model 117, 156, 176

Engine

270 in model 117, 156, 176, 242, 246.2

Modification notes

12.02.2020

Turn engine to top dead center position newly added.

Shown on engine 133 without code A14 (CAMTRONIC)

01a

Hold-down tool

04

Bolts

3e

Camshaft positioner (inlet)

01b

Hold-down tool

1

Cylinder head

4

Segment disc

02a

Bracket

2a

Exhaust camshaft

4a

Partial segment

02e

Bracket

2e

Intake camshaft

5

Bearing slot

03

Bearing brackets

3a

Camshaft positioner (exhaust)

Schematic diagram

4

Segment disc

4a

Partial segment

5

Bearing slot

6

Cylinder head cover

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 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 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

 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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A



Remove

1

Lift vehicle with lifting platform.

AR00.60-P-1000AK

2

Remove cylinder head cover (6).

Engine 133 in model 117, 156, 176

AR01.20-P-5014MTA

Engine 270 in model 117, 156, 176, 242, 246.2

AR01.20-P-5014MT

3

Open service flap on the fender liner of the front right fender.

4

Turn engine at the center bolt of the crankshaft in the direction of engine rotation to top dead center (TDC) ignition TDC on cylinder 1.

AR01.10-P-1000-01MT

 The edge of the section (4a) of the exhaust camshaft (2a) and the bearing slot (5) of the intake camshaft (2e) point upward.

 For the following operation steps ensure that the crankshaft is not turned.

 Socket wrench bit

*001589650900

Adjust

5

Remove camshaft positioners (3a, 3e).

AR05.20-P-7201MT

6

Turn exhaust camshaft(2a) and intake camshaft(2e) to basic position.

 The edge of the section (4a) of the exhaust camshaft (2a) and the bearing slot (5) of the intake camshaft (2e) must point upward vertically.

7

Install hold-down tools (01a, 01b).

 Engine 133 in model 117, 156, 176
except code A14 (Camtronic)
Engine 270 in model 117, 156, 176, 242, 246.2
except code A14 (Camtronic)
Use 26 mm dia. inserts.

 Engine 133 in model 117, 156, 176
with code A14 (Camtronic)
Engine 270 in model 117, 156, 176, 242, 246.2
with code A14 (Camtronic)
Use insert with a dia. of 29 mm.

 Screw in screws (04) until the bearing brackets (03) rest flat on the cylinder head (1).

 Holding device

*270589016100

8

Install the brackets (02a, 02e).


Before installing the brackets (02a, 02e) the exhaust camshaft (2a) and intake camshaft (2e) must be in the top dead center position so that the brackets (02a, 02e) can be positioned and installed without further pressure.
The brackets (02a,  02e) are not suitable to bring the exhaust camshaft (2a) or intake camshaft (2e) into the position.
This leads to damage to the holders (02a,  02e) and also possibly to incorrect timing.


The exhaust camshaft (2a) and intake camshaft (2e) may exclusively be turned using the  socket or with the screw/bolt (N 000000 005561) in combination with the disk (A604990 0040).
Otherwise the exhaust camshaft (2a) and intake camshaft (2e) will be damaged.

 In order to be able to install the brackets (02a, 02e) on the hold-down tool (01a), it is necessary to turn the exhaust camshaft (2a) and intake camshaft (2e) with the  socket wrench socket or with the screw (N 000000 005561) in combination with the disk (A604990 0040).

 Holding device

*270589016100

 Socket

*270589010700

9

Install camshaft positioners (3a, 3e) and tighten control valves slightly by hand.

 During mounting of the camshaft positioner or the timing chain ensure that the crankshaft does not turn.

 The final tightening of the control valves first take place after installation of the chain tensioner.

 The camshaft positioner (3a, 3e) must still be turned freely to exhaust camshaft (2a) and intake camshaft (2e).



Install

10

Install the chain tensioner.

Engine 133 in model 117, 156, 176

AR05.10-P-7800MTA

Engine 270 in model 117, 156, 176, 242, 246.2

AR05.10-P-7800MT

11

Tighten control valves of the camshaft positioners (3a, 3e) with final tightening.

AR05.20-P-7201MT



Specified engine oils (service) - Overview

BB00.40-P-0223-02A

 Lubricate thread and bolt head contact surface of the control valves. Tighten control valves with torque evenly and without interruption.

12

Remove brackets (02a, 02e) from the hold-down tool (01a).

 Hold-down tools (01a,01b) remain at cylinder head (1).

13

Loosen screws (04) at the hold-down tools (01a, 01b) until the camshafts (2a, 2e) can be turned.

 Hold-down tools (01a,01b) remain at cylinder head (1).



Check

14

Turn engine at the center bolt of the crankshaft in the direction of engine rotation through two revolutions and turn to top dead center (TDC) (ignition TDC) at cylinder 1.

AR01.10-P-1000-01MT

 Socket wrench bit

*001589650900

15

Tighten screws (04) at hold-down tools (01a, 01b) slightly by hand.

16

Check basic position of the camshafts (2a, 2e); to do this, install the brackets (02a, 02e) on the hold-down tool (01a).


Turn the exhaust camshaft (2a) and intake camshaft (2e) only with the  socket wrench socket.
Otherwise the exhaust camshaft (2a) and intake camshaft (2e) will be damaged.


Before installing the brackets (02a, 02e), the exhaust camshaft (2a) and intake camshaft (2e) must be in the top dead center position so that the brackets (02a, 02e) can be positioned and installed without further pressure.
The holder (02a, 02e) is not suitable to bring the exhaust camshaft (2a) or intake camshaft (2e) into the position.
This leads to damage on the holders (02a, 02e) and also possibly to incorrect timing.

 In order to be able to install the brackets (02a, 02e) on the hold-down tool (01a), it is necessary to turn the exhaust camshaft (2a) and intake camshaft (2e) with the  socket wrench socket.

If brackets (02a,02e) cannot be installed,



Repeat work procedure from operation step 4.

17

Remove brackets (02a, 02e) and hold-down tools (01a,01b).

18

Close service flap on the fender liner of the front right fender.

19

Lower vehicle with vehicle lift.

AR00.60-P-1000AK

20

Install cylinder head cover (6).

Engine 133 in model 117, 156, 176

AR01.20-P-5014MTA

Engine 270 in model 117, 156, 176, 242, 246.2

AR01.20-P-5014MT