11 41 010 Removing and Installing/Replacing Chain Module For Oil Pump/Vacuum Pump
11 41 010 - Removing and installing/replacing chain module for oil pump/vacuum pump (N51)
Special tools required:
Important!
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without
colour coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).
Necessary preliminary tasks:
- Remove cylinder head cover Service and Repair.
- Remove engine oil sump Service and Repair.
- Remove drive belt Service and Repair.
- Remove tensioner for drive belt.
- Remove vibration damper Service and Repair at front.
- Remove sealing cover Service and Repair for vacuum pump.
Turn sprocket wheel (3) at central bolt (crankshaft) into position.
Secure special tool 11 0 290 to sprocket wheel (3) and special tool 11 4 362.
Release screw (2).
Tightening torque: 11 66 2AZ. Mechanical Specifications
Press timing chain with chain tensioner (1) in direction of arrow.
Disconnect timing chain with special tool 11 4 120.
Feed out sprocket wheel (3) at hexagon head of vacuum pump (4).
Installation Note:
A lock pin is pre-installed if the triangular drive is replaced.
Release bolt (1) on sprocket wheel.
Tightening torque: 11 41 4AZ. Mechanical Specifications
Release screws (2).
Tightening torque: 11 41 3AZ. Mechanical Specifications
Secure crankshaft and camshaft Adjustments.
Do not remove special tools 11 0 300 and 11 4 280.
Fit special tool 11 9 280.
Release central bolt (1).
Note:
A second person is required.
Remove hub (2) towards front.
Installation Note:
Replace radial seal Service and Repair at front.
Open screw plug on bedplate.
Installation Note:
Replace seal.
Release bolt on triangular drive.
Tightening torque: 11 41 3AZ. Mechanical Specifications
Installation Note:
Replace aluminium screws.
Remove triangular drive (1) in direction of arrow.
Important!
Note installation direction of sprocket wheel (2).
Collar on sprocket wheel (2) points to timing chain drive.
Incorrect assembly will result in engine damage.
Note:
Procedure if engine is mounted on special tool 11 4 440 11 4 440 Engine Support Plate.
Release screw (1).
Tightening torque: 11 66 2AZ. Mechanical Specifications
Release screw (2).
Tightening torque: 11 41 3AZ. Mechanical Specifications
Unscrew bolt (3).
Tightening torque: 11 21 1AZ. Mechanical Specifications
Installation Note:
Mark screw (3) with a coloured spot.
Remove hub (4) towards front.
Tighten down special tool 11 5 200 with screws (1) to hub.
Do not remove special tools 11 0 300 and 11 4 280.
Remove belt tensioner.
Screw in special tool 11 4 360.
Mount special tool 11 9 280 on 11 5 200.
Support special tool 11 9 280 on special tool 11 4 360.
Special tool 11 0 300 secures crankshaft.
Tighten central bolt (1) to jointing torque.
Tightening torque: 11 21 1AZ. Mechanical Specifications
Mark central bolt and hub with paint.
Apply stroke of paint (1) for torsion angle tightening to tool.
See illustration.
Important!
Do not remove tool from central bolt during torsion angle tightening - risk of damage.
Installation Note:
Replace radial seal Service and Repair at front.
Assemble engine.