Check the engine valve timing

AR05.10-P-6858V

Check the engine valve timing

7.12.05

 

Remove/install

1

Remove cylinder head covers

Air filter located at vehicle side.

AR01.20-P-5014B

Air filter located on engine side.

AR01.20-P-5014BV

2.1

Unbolt combination valve (on right)

 Only for engines with air pump.

Installation: Replace Gasket of combination valve.



*BA09.20-P-1001-01D



Checking

3

Inspect timing

Engine 112.910/911/912/920/921/922

/923/940/941/942/942/944/945/946/947

/949,

Engine 113.940/941/ 942/943944/960// 961

/962/963/965/967/968/980/981/982/984

/987/990/991/992,

Engine 113.960 with cylinder shutoff code 479 see: 

Inlet

*BE05.20-P-1001-02F

Outlet

*BE05.20-P-1002-02F



Camshaft code number and assignment

Engine 112, 113

AH05.20-N-0100-01A

4

Position engine to 40° after ignition TDC of cylinder 1

 Rotate engine at crankshaft in direction of rotation until 40° marking on belt pulley/vibration damper is aligned with marking on timing case cover. Slots at camshafts must be pointing in direction of inner V.

 The engine must not be turned back; otherwise the timing chain can get jammed.

5

Check basic position of camshafts

 Place locating plate for right camshaft (2) flush onto the right cylinder head and insert into the groove in the camshaft (6). Proceed the same way with the left-hand camshaft in the left-hand cylinder head.



*112589003200



*112589013200

If both locating plates cannot be inserted into the grooves: 

Set the basic position of camshafts.

AR05.20-P-6020AU

6.1

Inspect basic position of the balancing shaft

Only for Engine 112, see figure.

 The markings of the pin at front crankcase (A) and the notch in the correctional weight (B) on the front end of the correctional weight point to each other. The two scribe marks can be seen through the left timing case duct at a depth of about 22 cm from the cylinder head cover joint surface.

7

Install in the reverse order

Number

Designation

Engines 112.910/
911 left-hand

Engines 112.910/
911 right-hand

Engines 112.912/
913/920/
921/922/
923 on the left

BE05.20-P-1001-02F

Timing of inlet valve with 2 mm play and used timing chain

opens after TDC

°CA

24.9

26.5

26.9

closes after BDC

°CA

20.2

21.8

23.2

BE05.20-P-1002-02F

Timing of exhaust valve with 2 mm play and used timing chain

opens before BDC

°CA

28.1

26.5

29.1

opens after BDC

°CA

-

-

-

closes before TDC

°CA

13.1

11.5

14.1

Number

Designation

Engines 112.912/
913/920/
921/922/
923 right

Engines 112.940/941/
942/943/944/
945/946/947/
948/949/951/
976 left

BE05.20-P-1001-02F

Timing of inlet valve with 2 mm play and used timing chain

opens after TDC

°CA

28.5

24.9

closes after BDC

°CA

24.8

25.9

BE05.20-P-1002-02F

Timing of exhaust valve with 2 mm play and used timing chain

opens before BDC

°CA

27.5

31.5

opens after BDC

°CA

-

-

closes before TDC

°CA

12.5

12.1

Number

Designation

Engines 112.940/941/
942/943/944/
945/946/947/
948/949/951/
976 right

Engines 113.940/941/942/943 left

BE05.20-P-1001-02F

Timing of inlet valve with 2 mm play and used timing chain

opens after TDC

°CA

26.5

31.9

closes after BDC

°CA

27.5

28.2

BE05.20-P-1002-02F

Timing of exhaust valve with 2 mm play and used timing chain

opens before BDC

°CA

29.9

24.1

opens after BDC

°CA

-

-

closes before TDC

°CA

10.5

9.1

Number

Designation

Engines
113.940/941/
942/943 on the right

Engine 113.944

BE05.20-P-1001-02F

Timing of inlet valve with 2 mm play and used timing chain

opens after TDC

°CA

33.5

26

closes after BDC

°CA

29.8

34

BE05.20-P-1002-02F

Timing of exhaust valve with 2 mm play and used timing chain

opens before BDC

°CA

22.5

34

opens after BDC

°CA

-

-

closes before TDC

°CA

7.5

14

Number

Designation

Engines 113.960/
961/962/
963/964/
965/967/
968/971 left

Engines 113.960/
961/962/
963/964/
965/967/
968/971 right

Engines
113.980/
981/982/984 right and left

BE05.20-P-1001-02F

Timing of inlet valve with 2 mm play and used timing chain

opens after TDC

°CA

30.9

32.5

25

closes after BDC

°CA

25.7

27.3

39

BE05.20-P-1002-02F

Timing of exhaust valve with 2 mm play and used timing chain

opens before BDC

°CA

23.2

21.6

35

opens after BDC

°CA

-

-

-

closes before TDC

°CA

9.1

7.5

15

Number

Designation

Engines 113.987/988
989/990//991
992/993/995 left and right

BE05.20-P-1001-02F

Timing of inlet valve with 2 mm play and used timing chain

opens after TDC

°CA

25.7

closes after BDC

°CA

33.7

BE05.20-P-1002-02F

Timing of exhaust valve with 2 mm play and used timing chain

opens before BDC

°CA

31.5

opens after BDC

°CA

-

closes before TDC

°CA

11.3

Number

Designation

Engine
113.960
with code 479 right

Engine
113.960
with code 479 left

BE05.20-P-1001-02F

Timing of inlet valve with 2 mm play and used timing chain

opens after TDC

°CA

36.9

28.5

closes after BDC

°CA

28.5

14.8

BE05.20-P-1002-02F

Timing of exhaust valve with 2 mm play and used timing chain

opens before BDC

°CA

24.3

27.5

opens after BDC

°CA

-

-

closes before TDC

°CA

14.1

12.5

Number

Designation

Engines
112, 113

BA09.20-P-1001-01D

Bolt, intake manifold to cylinder head

M8

Nm

20