Camshaft: Adjustments
11 31 575 - Adjusting camshaft timing (S65)
Special tools required:
- 00 9 120 00 9 120 Torque Angle Measuring Dial
- 11 5 320
- 11 9 970 11 9 970 Set of Gauges
- 11 9 971
- 11 9 972
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 11 9 970 Set of Gauges (risk of damage!).
If the special tool 11 9 970 11 9 970 Set of Gauges cannot be positioned on the dihedron of the camshafts, bar the engine at the central bolt until the special tool 11 9 970 11 9 970 Set of Gauges can be secured on the cylinder head.
Release bolts (1) on cylinder bank 1.
Remove timing case cover (2).
Installation Note:
Replace seal.
Release bolts (1) on cylinder bank 2.
Remove timing case cover (2).
Installation Note:
Replace seal.
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 centre.
Before the crankshaft can be secured, the gauges 11 9 970 11 9 970 Set of Gauges must be positioned on the camshafts.
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.
Position of exhaust camshaft, cylinders 1-4.
Designation (A1) on dihedron (1) points upwards.
Rotate inlet camshaft with open-end wrench (1) with minimal effort at hexagon head in direction of arrow until special tool 11 9 972 11 9 970 Set of Gauges can be attached.
Designation (E1) on dihedron points upwards.
Secure special tool 11 9 972 11 9 970 Set of Gauges with bolts (2) on cylinder head to 10 Nm.
Rotate exhaust camshaft with open-end wrench with minimal effort in direction of arrow until special tool 11 9 971 11 9 970 Set of Gauges can be attached.
Designation (A1) on dihedron points upwards.
Secure special tool 11 9 971 11 9 970 Set of Gauges with bolts (1) on cylinder head to 10 Nm.
Important!
CCW thread!
Release central bolt (1).
Release central bolt (2).
Installation Note:
Replace central bolts (1 and 2).
Important!
Rotate crankshaft at central bolt back until special tool 11 5 320 can be secured in the 10° position.
Important!
Replace central bolts of adjustment units.
Central bolts must be fully screwed once (refer to Screw fastening list 11 36 Variable Camshaft Control VANOS).
Cylinders 1 to 4:
Always start screwing on the inlet side.
Secure central bolt (1) with special tool 00 9 120.
Important!
Screw central bolt fully once.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
4. Unscrew central bolt.
5. Preload central bolt to 10 Nm.
Secure central bolt (1) with special tool 00 9 120.
Important!
Screw central bolt fully once.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
4. Unscrew central bolt.
5. Preload central bolt to 10 Nm.
Camshafts, cylinders 1-4, remain secured with special tool 11 9 970 11 9 970 Set of Gauges.
Release special tool 11 5 320 and continue barring engine at central bolt 10° to firing TDC position of cylinder no. 1.
Installation Note:
This minimizes timing chain play.
Secure crankshaft with special tool 11 5 320.
Cylinders 1 to 4:
Always start screwing on the inlet side.
Secure central bolt (1) with special tool 00 9 120.
Important!
Central bolt final tightening.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
Secure central bolt (1) with special tool 00 9 120.
Important!
Central bolt final tightening.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
Important!
Remove all special tools.
Position of inlet camshaft, cylinders 5-8.
Designation (E2) on dihedron points upwards.
Installation Note:
If necessary, crank at crankshaft central bolt.
Position of exhaust camshaft, cylinders 5-8.
Designation (A2) on dihedron points upwards.
Secure inlet camshaft with special tool 11 9 971 11 9 970 Set of Gauges.
Secure exhaust camshaft with special tool 11 9 972 11 9 970 Set of Gauges.
Secure special tools 11 9 971 11 9 970 Set of Gauges and 11 9 972 11 9 970 Set of Gauges with bolts (1) on cylinder head to 10 Nm.
Important!
CCW thread!
Release central bolt (1).
Release central bolt (2).
Installation Note:
Replace central bolts (1 and 2).
Important!
Rotate crankshaft at central bolt back until special tool 11 5 320 can be secured in the 10° position.
Important!
Replace central bolts of adjustment units.
Central bolts must be fully screwed once (refer to Screw fastening list 11 36 Variable Camshaft Control VANOS).
Cylinders 5 to 8:
Always start screwing on the inlet side.
Secure central bolt (1) with special tool 00 9 120.
Important!
Screw central bolt fully once.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
4. Unscrew central bolt.
5. Preload central bolt to 10 Nm.
Secure central bolt (1) with special tool 00 9 120.
Important!
Screw central bolt fully once.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
4. Unscrew central bolt.
5. Preload central bolt to 10 Nm.
Camshafts, cylinders 5-8, remain secured with special tool 11 9 970 11 9 970 Set of Gauges.
Release special tool 11 5 320 and continue barring engine at central bolt 10° to firing TDC position of cylinder no. 1.
Installation Note:
This minimizes timing chain play.
Secure crankshaft with special tool 11 5 320.
Cylinders 5 to 8:
Always start screwing on the inlet side.
Secure central bolt (1) with special tool 00 9 120.
Important!
Central bolt final tightening.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
Secure central bolt (1) with special tool 00 9 120.
Important!
Central bolt final tightening.
1. Joining 20 Nm
2. Settling torque 80 Nm
3. Torsion angle 200°
Remove all special tools.
Remove all special tools.
Check timing Testing and Inspection.
Assemble engine.