Removing and Installing/Replacing Right Inlet VANOS Gear
11 36 148 - Removing and installing/replacing right inlet VANOS gear (S65)
Special tools required:
Important!
Central bolts on VANOS gears have left-hand threads.
Do not release the central bolt of the adjustment units without the special tool 11 9 970.
Grease contact surfaces of central bolts with copper paste.
Necessary preliminary tasks:
- Remove right cylinder head cover Removing and Installing/Sealing Right Cylinder Head Cover
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.
The procedure for checking timing Testing and Inspection is different from that for adjusting.
Crank engine at central bolt.
Secure crankshaft with special tool 11 5 320 in firing TDC position of cylinder no. 1.
Position of inlet camshafts, cyl. 1-4, in firing TDC position of cylinder no. 1.
Dihedron of inlet camshafts is vertical to cylinder axis, letters/numbers on camshafts point upwards (E1).
Position of exhaust camshafts, cyl. 1-4, in firing TDC position of cylinder no. 1.
Dihedron of camshafts is vertical to cylinder axis, letters/numbers (A1) on camshafts (1) point 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 (1) with minimal effort at hexagon head 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 9 972 11 9 970 Set of Gauges with bolts (2) on cylinder head to 10 Nm.
Align gearwheels on exhaust adjustment unit with special tool 11 5 370.
Important!
Removal/installation is not possible without hexagon socket screw (2).
Hexagon socket screw (1) must not be longer than 10 mm.
Gearwheels of exhaust VANOS gear are pretensioned with a spring.
Insert M5x10 hexagon socket screw on VANOS gear.
Important!
CCW thread!
Release central bolt (1).
Installation Note:
Replace central bolt (1).
Remove exhaust adjustment unit
Installation Note:
If the hexagon socket screw is released or forgotten by mistake, the gear teeth can be readjusted with special tool 11 5 370.
Screw in knurled screw on special tool 11 5 370 until gearwheel (1) lines up with bore (see arrow) on thread.
Failure to tension the exhaust VANOS gear (1) will result in rattling noises at idle.
Note:
Picture shows (S85).
Installation Note:
Check O-ring (1) on VANOS gear, replace if necessary.
Release chain tensioner (1).
Installation Note:
Replace sealing ring.
Tightening torque: 11 31 1AZ Mechanical Specifications
Important!
CCW thread!
Release central bolt (1).
Installation Note:
Replace central bolt (1).
Remove inlet adjustment unit (2).
Lay timing chain (1) on inlet camshaft (2).
EIN - Inlet adjustment unit
AUS - Exhaust adjustment unit
Important!
Replace central bolt of adjustment unit.
Central bolt must be fully screwed once.
Important!
Rotate crankshaft at central bolt back until special tool 11 5 320 can be secured in the 10° position.
Installation Note:
Coat contact face of new central bolt (1) with copper paste.
Position inlet adjustment unit with timing chain on inlet camshaft.
Screw in central bolt (2) hand-tight.
Position exhaust adjustment unit on exhaust camshaft.
Hexagon socket screw points upwards.
Screw in central bolt (1) hand-tight.
Install chain tensioner (1).
Tightening torque: 11 31 1AZ Mechanical Specifications
Screw in central bolt (1) with special tool 00 9 120.
1. Joining 10 Nm
2. Joining 20 Nm
3. Settling torque 80 Nm
4. Torsion angle 200°
5. Unscrew central bolt.
6. Joining 10 Nm
Insert central bolt (1) and screw with special tool 00 9 120.
1. Joining 10 Nm
2. Joining 20 Nm
3. Settling torque 80 Nm
4. Torsion angle 200°
5. Unscrew central bolt.
6. Joining 10 Nm
Remove hexagon socket screw (1) or special tool 11 5 370.
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 and gearwheel 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°
Remove all special tools.
Check timing Testing and Inspection, bank 1, cylinders (1 to 4).
Assemble engine.