Replace timing chain

AR05.10-P-7601RT

Replace timing chain

14.2.12



Removing

 Danger!

Risk of explosion caused by oxyhydrogen gas. Risk of poisoning and caustic burns caused by swallowing battery acid. Risk of injury caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries

No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and safety glasses. Only pour battery acid into suitable and appropriately marked containers.

AS54.10-Z-0001-01A

1

Disconnect ground cable from battery

 Insulate clamping device of the ground line in order to prevent inadvertent contact with the ground point of the battery.

AR54.10-P-0003RT



Notes on battery

All models

AH54.10-P-0001-01A

 Danger!

Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.

When moving components, ensure that no body parts or limbs are within the operating range of moving parts.

AS00.00-Z-0011-01A

2

Open engine hood and raise to vertical position

AR88.40-P-1000RT

3

Remove partition wall between wheelhouses

AR62.30-P-2400RT

4

Remove one spark plug from each cylinder

 To ensure that the engine can be easily cranked when drawing in the timing chain and to avoid the timing chain skipping, see.



Replace spark plugs

AP15.10-P-1580RT

5

Remove cylinder head covers

AR01.20-P-5014RT

6

Check the engine valve timing

If necessary: 

AR05.10-P-6858RT

Set the basic position of camshafts

AR05.20-P-6020RT

7

Remove chain tensioner

AR05.10-P-7800RT

8

Remove camshaft Hall sensor

AR15.10-P-2000RT

9

Crank engine in direction of rotation until the link for separating the timing chain is easily accessible

 The timing chain is separated one chain link next to the copper plate (on right). See new timing chain.

10

Remove right camshaft bearing bridge

AR05.20-P-7103RT

11

Install holding bush (3) onto right camshaft

 Only fit Torx bolts (4).

 Holding bush

*112589054000

12

Mount retainer for timing chain (on the right) (1) and retainer for timing chain (on the left) (2) for timing chain on the right and left cylinder head

 Retainer

*112589044000

13

Separate timing chain

 Cover over timing case recess with a clean cloth. Parts which have fallen into the timing case recess, must be removed.

AR05.10-P-7601-01AV

 Connect the old chain to the new timing chain while pulling out the old timing chain.

 Chain separating tool

*602589023300

 Pressure screw

*602589056300

 Thrust pins

*602589056301

 Case

*602589009800



Installing

14

Draw in new timing chain

 Always remove the assembly link after drawing in the new timing chain. These are only an assembly aid and not intended for engine running.

AR05.10-P-7601-04AV

 Pull in the new timing chain by turning the crankshaft in its standard direction of rotation.

 Assembly links

*602589024000

 Case

*602589009800

15

Remove retainer for timing chain (on the right) (1) and retainer for timing chain (on the left) (2) for timing chain on the right and left cylinder head

16

Rivet new timing chain

AR05.10-P-7601-02AV



*BA05.20-P-1001-01B

 Riveting tool

*602589003900

 Assembly inserts

*103589016300

 Open-end wrench

*112589000100

 Torque wrench

*001589722100

 Case

*602589009800

17

Crank engine in direction of rotation

18

Check the engine valve timing

AR05.10-P-6858RT

19

Remove holding bush (3) from right camshaft

20

Fit right camshaft bearing bridge

AR05.20-P-7103RT

21

Install camshaft Hall sensor

AR15.10-P-2000RT

22

Installing chain tensioner

AR05.10-P-7800RT

23

Install cylinder head covers

AR01.20-P-5014RT

24

Install spark plugs



Replace spark plugs

AP15.10-P-1580RT

25

Install partition wall between wheelhouses

AR62.30-P-2400RT

26

Connect ground cable to battery

AR54.10-P-0003RT

 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 running engine

Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A

27

Conduct engine test run and check the engine for leaks whilst it is running

 In the event of oil loss determine and eliminate cause, otherwise malfunctions, transmission damage, and serious environmental pollution may occur.

 Danger!

Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.

When moving components, ensure that no body parts or limbs are within the operating range of moving parts.

AS00.00-Z-0011-01A

28

Close engine hood

AR88.40-P-1000RT

Number

Designation

Engines
113.940/941/
942/943/944/
948/961/962/
963/964/965/
966/967/968/
969/971/980/
981/982/984/
986/992/995

BA05.20-P-1001-01B

Bolt for camshaft sprocket

M1245

Stage 1

Nm

50

Stage 2

°

90