11 31 575 Adjusting camshaft timing (S65)

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: Central bolts on VANOS gears have left-hand threads.

IMPORTANT: The procedure for adjusting the timing is different from that for checking the timing.
The letters/numbers on the camshafts (E1 and A1) and (E2 and A2) must point upwards.
Do not release the central bolts of the adjustment units without the special tool 11 9 970 GAUGE(risk of damage!).
If the special tool 11 9 970 GAUGE cannot be positioned on the dihedron of the camshafts, bar the engine at the central bolt until the special tool 11 9 970 GAUGE can be secured on the cylinder head.

Release bolts (1) on cylinder bank 1.

Remove timing case cover (2).

Installation:

Replace seal.

Fig 1: Identifying Timing Case Cover And Bolts

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Release bolts (1) on cylinder bank 2.

Remove timing case cover (2).

Installation:

Replace seal.

Fig 2: Identifying Timing Case Cover And Bolts

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IMPORTANT: Both inlet and exhaust camshafts can be adjusted in the 1st cylinder firing TDC position.
Danger of mixing up both special tool bores.

10° before TDC
TDC= top dead center.

Before the crankshaft can be secured, the gauges 119970 GAUGE must be positioned on the camshafts.

Fig 3: Identifying Timing Marks

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Rotate crankshaft at central bolt.

IMPORTANT: Always start timing with bank 1 (cylinders 1-4).

Position of inlet camshaft, cylinders 1-4.

Designation (E1) on dihedron points upwards.

Fig 4: Identifying Inlet Camshaft Designation

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Position of exhaust camshaft, cylinders 1-4.

Designation (A1) on dihedron (1) points upwards.

Fig 5: Identifying Exhaust Camshaft Designation

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Rotate inlet camshaft with open-end wrench (1) with minimal effort at hexagon head in direction of arrow until special tool 11 9 972 can be attached.

Designation (E1) on dihedron points upwards.

Secure special tool 11 9 972 with bolts (2) on cylinder head to 10 Nm.

Fig 6: Rotating Inlet Camshaft Using Open-End Wrench

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Rotate exhaust camshaft with open-end wrench with minimal effort in direction of arrow until special tool 11 9 971 can be attached.

Designation (A1) on dihedron points upwards.

Secure special tool 11 9 971 with bolts (1) on cylinder head to 10 Nm.

Fig 7: Securing Special Tool (11 9 971) With Bolts On Cylinder Head

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IMPORTANT: CCW thread!

Release central bolt (1).

Release central bolt (2).

Installation:

Replace central bolts (1 and 2).

Fig 8: Identifying Central Bolts

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IMPORTANT: Rotate crankshaft at central bolt back until special tool 11 5 320 can be secured in the 10° position.

Fig 9: Identifying Crankshaft Position

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IMPORTANT: Replace central bolts of adjustment units.
Central bolts must be fully screwed once (refer to SCREW FASTENING LIST ).

Cylinders 1 to 4:

Always start screwing on the inlet side.

Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Screw central bolt fully once.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°
Unscrew central bolt.
Preload central bolt to 10 Nm.

Fig 10: Securing Central Bolt Using Special Tool (00 9 120)

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Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Screw central bolt fully once.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°
Unscrew central bolt.
Preload central bolt to 10 Nm.

Fig 11: Securing Central Bolt Using Special Tool (00 9 120)

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Camshafts, cylinders 1-4, remain secured with special tool 119970 GAUGE .

Release special tool 11 5 320 and continue barring engine at central bolt 10° to firing TDC position of cylinder no. 1.

Installation:

This minimizes timing chain play.

Secure crankshaft with special tool 11 5 320.

Fig 12: Identifying Crankshaft Position

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Cylinders 1 to 4:

Always start screwing on the inlet side.

Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Central bolt final tightening.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°

Fig 13: Securing Central Bolt Using Special Tool (00 9 120)

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Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Central bolt final tightening.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°

IMPORTANT: Remove all special tools.

Fig 14: Securing Central Bolt Using Special Tool (00 9 120)

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Position of inlet camshaft, cylinders 5-8.

Designation (E2) on dihedron points upwards.

Installation:

If necessary, crank at crankshaft central bolt.

Fig 15: Identifying Inlet Camshaft Designation

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Position of exhaust camshaft, cylinders 5-8.

Designation (A2) on dihedron points upwards.

Fig 16: Identifying Exhaust Camshaft Designation

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Secure inlet camshaft with special tool 11 9 971.

Secure exhaust camshaft with special tool 11 9 972.

Secure special tools 11 9 971 and 11 9 972 with bolts (1) on cylinder head to 10 Nm.

Fig 17: Securing Camshafts With Special Tools (11 9 971 And 11 9 972)

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IMPORTANT: CCW thread!

Release central bolt (1).

Release central bolt (2).

Installation:

Replace central bolts (1 and 2).

Fig 18: Identifying Central Bolts

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IMPORTANT: Rotate crankshaft at central bolt back until special tool 11 5 320 can be secured in the 10° position.

Fig 19: Identifying Crankshaft Position

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IMPORTANT: Replace central bolts of adjustment units.
Central bolts must be fully screwed once (refer to SCREW FASTENING LIST ).

Cylinders 5 to 8:

Always start screwing on the inlet side.

Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Screw central bolt fully once.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°
Unscrew central bolt.
Preload central bolt to 10 Nm.

Fig 20: Securing Central Bolt Using Special Tool (00 9 120)

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Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Screw central bolt fully once.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°
Unscrew central bolt.
Preload central bolt to 10 Nm.

Fig 21: Securing Central Bolt Using Special Tool (00 9 120)

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Camshafts, cylinders 5-8, remain secured with special tool 119970 GAUGE .

Release special tool 11 5 320 and continue barring engine at central bolt 10° to firing TDC position of cylinder no. 1.

Installation:

This minimizes timing chain play.

Secure crankshaft with special tool 11 5 320.

Fig 22: Identifying Crankshaft Position

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Cylinders 5 to 8:

Always start screwing on the inlet side.

Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Central bolt final tightening.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°

Fig 23: Securing Central Bolt Using Special Tool (00 9 120)

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Secure central bolt (1) with special tool 00 9 120 TORQUE ANGLE MEASURING DIAL .

IMPORTANT: Central bolt final tightening.

Joining 20 Nm
Settling torque 80 Nm
Torsion angle 200°

Remove all special tools.

Fig 24: Securing Central Bolt Using Special Tool (00 9 120)

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Remove all special tools.

Check TIMING .

Assemble engine.