Replace timing chain

AR05.10-S-7601SE

Replace timing chain

14.2.12

4.7.06

Method and sequence of steps - altered

Steps 1 to 5

Remove fan - added

Step 1



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 glasses. Only pour battery acid into suitable and appropriately marked containers.

AS54.10-Z-0001-01A

1

Remove fan

AR20.40-S-5614SE

2

Position piston of cylinder 1 at ignition TDC

3

Remove cylinder head covers

AR01.20-S-5011SE

4

Mount set of hold-down devices

 Holddown device kit

*642589003100



*BA01.30-N-1004-01Q

5

Remove bolt (6) for right camshaft sprocket

 The bolt (6) is located opposite locking pin (5) for the right intake camshaft.

6

Fix old timing chain (1) with a cable tie (7) on right camshaft sprocket.

7

Remove chain tensioner

AR05.10-S-7800SE

8

Remove bolts (3, 4) on right camshaft sprocket

9

Remove set of hold-down devices on the right

 Holddown device kit

*642589003100

10

Remove right intake camshaft

AR05.20-S-6992SE

11

Disconnect old timing chain (1)

AR05.10-S-7601-01SE

 Case

*602589009800

 Chain separating tool

*602589023300

 Pressure screw

*602589046300

 Thrust pins

*602589046301



Checking

12

Check right camshaft sprocket

 Check camshaft sprocket for damage and wear, replace if necessary.



Install

13

Fit right intake camshaft

 Only perform operation steps to install intake camshaft; do not install camshaft sprocket and cylinder head covers yet.

AR05.20-S-6992SE

14

Mount set of hold-down devices again on right camshaft

 Holddown device kit

*642589003100



*BA01.30-N-1004-01Q

15

Attach right camshaft sprocket

 Only mount right camshaft sprocket with one bolt.

16

Screw hold-down device (8) onto right cylinder head

 Holddown device

*642589014000

17

Draw in new timing chain (2)

 Replace assembly clip-type fastener (7.1), outer assembly plate (7.2) and assembly locking element (7.3) after fitting the new timing chain (2) with a rivet link, otherwise the new timing chain (2) could rip when the engine is running, leading to engine damage.

AR05.10-S-7601-04SE

 Remove cable tie (7) before cranking the engine.

 Case

*602589009800

 Assembly links

*602589024000

 Holddown device kit

*642589003100

 Holddown device

*642589014000

18

Remove hold-down device (8) on right cylinder head

 Holddown device

*642589014000

19

Remove set of hold-down devices on the right

 Holddown device kit

*642589003100

20

Fix new timing chain (2) with cable tie (7) on right camshaft sprocket.

21

Remove right intake camshaft

AR05.20-S-6992SE

22

Rivet new timing chain (2)

AR05.10-S-7601-02SE

 Assembly inserts

*112589096300

 Case

*602589009800

 Riveting tool

*602589003900

 Assembly inserts

*602589026300

 Thrust piece

*602589036300

23

Fit right intake camshaft

 Install right camshaft sprocket; do not install cylinder head covers yet.

AR05.20-S-6992SE

24

Installing chain tensioner

AR05.10-S-7800SE

25

Crank engine in direction of rotation

 Remove cable tie (7) before cranking the engine.



Checking

26

Check basic position of camshafts

AR05.20-S-6010SE

 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

27

Check for leaks with engine running

Number

Designation

Engine
642 in model 639

BA01.30-N-1004-01Q

Camshaft retainer bracket to cylinder head

Nm

8