Remove/install chain tensioner

AR05.10-P-7800VB

Remove/install chain tensioner

28.11.11



Removing

1

Disconnect ground line from battery

Model 211.0

AR54.10-P-0003T

Model 211.2

AR54.10-P-0003TA

Model 219

AR54.10-P-0003TX

Model 171

AR54.10-P-0003V

2

Rotate engine at crankshaft center bolt in direction of engine rotation to a 40° crankshaft angle after ignition TDC



*001589650900

3.1

Remove alternator

Model 171

AR15.40-P-5032VA

Model 211, 219 with engine 272

AR15.40-P-5032TS

3.2

Detach connector for circuit 61 (D+) from alternator and remove alternator from timing case cover (2)

 The alternator remains with its attached line for circuit 30 (B+) in the engine compartment.

Model 211, 219 with engine 273

AR15.40-P-5032TS

4

Remove chain tensioner (1) from timing case cover (2)



Install

5

Screw new chain tensioner (1) into timing case cover (2) and tightened to prescribed torque

 Replace chain tensioner (1). The previously installed chain tensioner must not be reinstalled since, on removal of pressure bolt (1a), it is pressed into the end position and the locking device of the pressure bolt prevents its return stroke. This would overstretch the timing chain on reinstalling.



*BA05.10-P-1008-01B

6

Remove cap (3)

7

Turn engine at center bolt on the crankshaft with prescribed torque against direction of engine rotation (arrow), while counterholding left exhaust camshaft (4) at rear with a suitable tool

 This unlocks the chain tensioner (1).



*BA05.10-P-1009-01B

8

Rotate engine at the center bolt of the crankshaft in the direction of rotation of the engine through a 90° crank angle.

 The thrust pin (1a) for chain tensioner (1) will be pushed out and tensions the timing chain.

9

Install end cover (3)

10.1

Install alternator

Model 171

AR15.40-P-5032VA

Model 211, 219 with engine 272

AR15.40-P-5032TS

10.2

Connect terminal 61 (D+) connector to the alternator and mount alternator on timing case cover (2)

Model 211, 219 with engine 273

AR15.40-P-5032TS

11

Connect ground cable to battery

Model 211.0

AR54.10-P-0003T

Model 211.2

AR54.10-P-0003TA

Model 219

AR54.10-P-0003TX

Model 171

AR54.10-P-0003V

 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

12

Carry out an engine test run and check engine for leaks

Number

Designation

Engine
272

Engine
273

BA05.10-P-1008-01B

Chain tensioner on timing case

M221.5

Nm

70

70

BA05.10-P-1009-01B

Torque on unlock chain tensioner

Nm

70

70