Set basic position of camshafts

AR05.20-P-6020OLD

Set basic position of camshafts

16.9.15

Engine

651 in model 205, 253

2

Marking on major assembly carrier

6

Camshaft bearing cap

3

Screw/bolts

7

Hold-down tool

4

Camshaft sprockets

8

Marking on camshaft

5

Screw/bolts

9

Marking on camshaft bearing cap



Remove

1

Remove engine compartment cover

2

Remove cylinder head cover

AR01.20-P-5014OLD

3

Rotate engine at crankshaft using counterholder in direction of engine rotation and place piston for cylinder 1 at top dead center


Do not crank engine at screw/bolts (3) for camshaft sprockets. The engine must not be turned back.
The timing chain can skip otherwise and cause engine damage.

 The 0° marking (arrow) on belt pulley/vibration damper must match with marking on major assembly carrier (2).

 Counterholder

*651589074000

4

Loosen screw/bolts (3) until the camshaft sprockets (4) can be turned on the camshafts

 Screw/bolts (3) are designed with a left-hand thread.

5

Mark installation position of camshaft bearing cap (6) before taking off

6

Remove screw/bolts (5) and remove camshaft bearing cap (6) at both camshafts on camshaft sprocket (4)

7

Position camshafts with hold-down tool (7)

 To do this turn camshafts and  mount hold-down tool (7) on the camshaft unstressed.

 Holddown device

*651589094000

8

Tighten screw/bolts (3) on the camshaft sprockets (4)

 Screw/bolts (3) are designed with a left-hand thread.

 Screw/bolt, camshaft sprocket to camshaft

*BA05.20-P-1001-01N

9

Remove hold-down tool (7)

 Holddown device

*651589094000



Install

10

Mount camshaft bearing cap (6) at both camshafts on camshaft sprocket (4) and tighten down screw/bolts (5)


The camshaft bearing caps (6) are asymmetrical. Note marking when mounting.
The camshafts can get damaged otherwise.

 Screw/bolt, camshaft bearing cap to cylinder head

*BA05.20-P-1002-01N

11

Install cylinder head cover

AR01.20-P-5014OLD

12

Install engine compartment cover

 Camshaft

Number

Designation

Engine 651

BA05.20-P-1001-01N

Screw/bolt, camshaft sprocket to camshaft

Stage 1

Nm

55

Stage 2

°

90

 Camshaft

Number

Designation

Engine 651

BA05.20-P-1002-01N

Screw/bolt, camshaft bearing cap to cylinder head

Stage 1

Nm

5

Stage 2

Nm

9