Remove/install chain tensioner

AR05.10-D-7800US

Remove/install chain tensioner

29.8.07



Removing

1

Disconnect battery ground line

AR54.10-D-0003SD

2

Remove viscous fan clutch

AR20.40-D-5660SF

3

Remove alternator

AR15.40-D-5032US

4

Unscrew the chain tensioner (1) from the timing case cover (3)



Install

5

Screw the chain tensioner (1) into the timing case cover (3)


 Install a new chain tensioner (1) as a rule.

*BA05.10-N-1001-01H

6

Remove the cap (5) of the exhaust camshaft (6) on the left cylinder head

7

Hold the exhaust camshaft (6) in the left cylinder head with a suitable socket wrench, and turn the engine at the vibration damper (4) against the direction of engine rotation (arrow) until the prescribed torque is reached



 The chain tensioner (1) is released when the prescribed torque is reached.

*BA05.10-N-1002-01H

8

Turn the engine at the vibration damper (4) in the direction of engine rotation by a crank angle of 90°.

 The pressure pin (2) of the chain tensioner (1) is pushed out by the spring load and stretches the timing chain over the tensioning rail.

9

Install the cap (5) of the exhaust camshaft (6)

 Check the cap (5) for damage, replace if required.

10

Install generator

AR15.40-D-5032US

11

Install viscous fan clutch

AR20.40-D-5660SF

12

Connect ground cable to battery

AR54.10-D-0003SD

 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

13

Perform engine test run and check engine for leaks in the area of the chain tensioner (1)

Number

Designation

Engine
272.979
in model
906

BA05.10-N-1001-01H

Chain tensioner to timing case

Nm

70

BA05.10-N-1002-01H

Torque to unlock chain tensioner

Nm

70