Set basic position of camshafts

AR05.20-L-6020VB

Set basic position of camshafts

3.11.09



Removing

1

Inspect basic position of camshaft

AR05.20-P-6010GF

2

Position piston of cylinder 1 to 30° after ignition TDC

 Rotate engine at crankshaft in direction of rotation of engine.
The 30° marking on the belt pulley must be aligned with the positioning edge (arrow) on timing case cover.

At 30° after ignition TDC at cylinder 1 the camshaft can be rotated without the valves touching the piston crown.

3

Remove chain tensioner (1)

AR05.10-L-7800VB

4

Unscrew bolt (6) and take camshaft sprocket (5) off at the camshaft (2), lift off timing chain (3)

Use open-end wrench (7) for counterholding camshaft (2).

*104589010100

5

Rotate camshaft (2) with open-end wrench (7) into basic position

 Camshaft marking must be centered relative to marking on camshaft bearing cap (arrows).

*104589010100

6

Reset piston on cylinder 1 to ignition TDC

 When doing this, pull timing chain (3) up tight.
 The TDC marking on the belt pulley must be aligned with the positioning edge (arrow) on the timing case cover. The cams on cylinder 1 are positioned up at an angle.



Install

7

Fit timing chain (3) at the camshaft sprocket (5)

8

Install camshaft sprocket (5) with timing chain (3) fitted on and tighten bolt (6) fully

 Replace Torx screws (6); use only once.
Pay attention to dowel pin (4).



*BA05.20-P-1001-01C

Use open-end wrench (7) for counterholding camshaft (2).

*104589010100

9

Install chain tensioner (1)

AR05.10-L-7800VB

10

Crank engine twice in direction of rotation of engine

11

Inspect basic position of camshaft

AR05.20-P-6010GF

Number

Designation

Engine
166.940/
960/990/
995

BA05.20-P-1001-01C

Bolt, camshaft sprocket to camshaft

Stage 1

Nm

20

Stage 2

 °

60