Replace timing chain

AR05.10-P-7601W

Replace timing chain

25.6.14

ENGINE

276 in MODEL 172

Modification notes

18.3.14

Document adapted to the altered repair method and INA timing chain; added

Shown on engine 276 with IWIS timing chain

01

Chain breaker tool

03

Pin

1

Old timing chain

02

Thrust spindle

04

Assembly link

2

New timing chain

 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



Remove

1

Detach ground line from battery

AR54.10-P-0003W



Notes on battery

AH54.10-P-0001-01A

2

Remove camshafts with camshaft positioners

AR05.20-P-6992W

 The camshaft positioners remain on the camshafts.

3

Determine variant of timing chain

AR05.10-P-7601-05MM

 There are two different variants of the chain drive which one can differentiate between simply by means of optical checking. For modification of the chain drive all parts engaging with the timing chain must be replaced.

4.1

Disconnect old timing chain (1)

Engines with IWIS timing chain

AR05.10-P-7601-01MM

 Pressure screw

*602589056300

 Chain separating tool

*602589023300

 Case

*602589009800

For a timing chain stretch, replace both secondary chains and the primary chain drive timing chain:



Replace primary chain drive timing chain

AR05.10-P-7612W

4.2

Disconnect old timing chain (1)

Engines with INA timing chain

AR05.10-P-7601-01MMA

 Rivet press tool

*276589003900

For a timing chain stretch, replace both secondary chains and the primary chain drive timing chain:



Replace primary chain drive timing chain

AR05.10-P-7612W



Install

5

Draw in new timing chain (2) using an assembly link (04)

AR05.10-P-7601-04MM

 Case

*602589009800

 Assembly element

*271589096300

6.1

Rivet new timing chain (2)

Engines with IWIS timing chain

AR05.10-P-7601-02MM

 Assembly insert

*278589016300

 Riveting tool

*602589003900

 Case

*602589009800

6.2

Rivet new timing chain (2)

Engines with INA timing chain

AR05.10-P-7601-02MMA

 Rivet press tool

*276589003900

7

Install camshafts with camshaft positioners

AR05.20-P-6992W

 Only install cylinder head covers after checking the basic position of the camshafts.

8

Check basic position of the camshafts using the installed chain tensioner and correct if necessary

AR05.20-P-6020W

9

Connect ground line to battery

AR54.10-P-0003W



Notes on battery

AH54.10-P-0001-01A

 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

10

Carry out an engine test run, checking the engine for proper operation and leaktightness