Set basic position of camshafts

AR05.20-L-6020VB

3.11.09

ENGINE 166.961 /991 in MODEL 414.700

P05.20-0321-09

1 Chain tensioner

2 Camshaft

3 Timing chain

6 Screw

7  Open-end wrench

4 Dowel pin

5 Camshaft sprocket

	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

 Camshaft

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

104 589 01 01 00

Open-end wrench, double

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