Adjust basic position of camshafts

AR05.20-D-6025C

10.5.96

ENGINE 111.979 in MODEL 901, 902, 903, 904

ENGINE 111.984 in MODEL 901.6, 902.6, 903.6, 904.6

D05.20-1002-09

1 Slide rail

2 Torx bolt

3 Exhaust camshaft sprocket

4 Timing chain

5 Inlet camshaft sprocket

6 Chain tensioner

7  Locking pin

"A" Reference edge on timing chain cover

"B" Position of crankshaft for rotating camshafts

"C" Basic position of crankshaft for setting timing

	Remove
1	Inspect basic position of camshafts		AR05.20-D-6010C
2	Remove slide rail (1) at cylinder head		AR05.10-D-8432C
3	Position piston of cylinder 1 to 30° after ignition TDC (position "B")	Rotate engine at crankshaft  At 30° after ignition TDC of cylinder 1 it is possible to rotate the camshafts without the valves touching the piston crown.	AR01.00-D-0120C
4	Remove chain tensioner (6)		AR05.10-D-7800C
5	Remove exhaust camshaft sprocket (3)	 It is only necessary to remove the exhaust camshaft sprocket in order to correct the basic position.	AR05.20-D-6992-08C
			*000589011000
6	Rotate camshafts into basic position and lock in place with locking pin (7)	Lift timing chain off inlet camshaft sprocket (5) for this step	AR05.20-D-6992-07C
			*104589010100
7	Move piston of cylinder 1 back to 20° after ignition TDC (position "C")	 Pull timing chain (4) up tight at the inlet camshaft for this step.
	Install
8	Fit timing chain (4) onto inlet camshaft sprocket (5)
9	Install exhaust camshaft sprocket (3) with timing chain (4) fitted on	 Replace torx bolt (2).	AR05.20-D-6992-08C
			*BA05.20-N-1001-01A
			*000589011000
10	Install chain tensioner (6)		AR05.10-D-7800-02C
			*BA05.10-N-1001-01A
			*BA05.10-N-1002-01A
11	Install slide rail (1) in cylinder head		AR05.10-D-8432C
12	Take off locking pin (7)
13	Once again check basic position of the camshafts		AR05.20-D-6010C
14	Fit remaining parts to engine

 Timing chain drive

Number	Designation		Engine 111.979/ 984


BA05.10-N-1001-01A	End piece in chain tensioner housing	Nm	40
BA05.10-N-1002-01A	Chain tensioner housing in timing case cover	Nm	80

 Camshaft

Number	Designation			Engine 111.979


BA05.20-N-1001-01A	Camshaft sprocket/flange shaft to camshaft	1st stage	Nm	20
		Step 2	°	60

111 589 03 15 00

104 589 01 01 00

000 589 01 10 00

Locking pins

Torx bit set

Open-end wrench