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 (N52K)

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
- For E81, E82, E87, E88, E90, E91, E92, E93:
Remove cowl panel cover
- Remove oil sump
- Remove drive belt
- Remove drive belt tensioner
- Remove vibration damper
- Remove sealing cover for vacuum pump

Procedure on installed engine:
Turn sprocket (3) with central bolt at crankshaft into position until special tool 11 0 290 can be secured.
Simultaneously secure special tool 11 0 290 to sprocket (3) and special tool 11 4 362.
Release screw (2) for sprocket (3).
Tightening torque 11 66 2AZ.

Press timing chain with chain tensioner (1) in direction of arrow.
Disconnect timing chain with special tool 11 4 120.
Feed out sprocket (3) at hexagon head (4) of vacuum pump.

Installation note:
If the chain module is replaced, a mounting bar (2) is already pre-installed.

NOTE: To release bolt (1), insert a 6 mm drill bit between sprocket and oil pump housing.

Release screw (1) for sprocket.
Tightening torque 11 41 6AZ.
Release screws (2) for chain module.
Tightening torque 11 41 5AZ.

Installation note:
Replace aluminium screws.

Secure crankshaft and camshaft with special tools 11 0 300 and 11 4 280 (refer to Checking timing).

IMPORTANT:
Do not remove special tools 11 0 300 and 11 4 280 to release central bolt (1).
Employ a second person for gripping when releasing central bolt (1).

Screw special tool 11 9 280 onto hub of vibration damper.
Release central bolt (1).
Tightening torque 11 21 1AZ.

Installation note:.
Replace central bolt (1).

Remove hub (2) towards front.

Installation note:
Replace crankshaft radial seal at front.
Open screw plug on bedplate.
Tightening torque 11 11 8AZ.

Release aluminium screw (1) with special tool 11 8 640.
Tightening torque 11 41 4AZ.

Installation note:
Replace aluminium screws.

Remove chain module (1) in direction of arrow.

IMPORTANT:
Note installation direction of sprocket (2).
Collar (see arrow) on sprocket (2) points to engine.
Incorrect assembly will result in engine damage.

Procedure on removed engine:

NOTE: Engine is mounted on special tool 11 4 440.

Release screw (1) for sprocket.
Tightening torque 11 66 2AZ.
Release screw (2) for sprocket.
Tightening torque 11 41 6AZ.
Release central bolt (3).
Tightening torque 11 21 1AZ.

Installation note:
Mark central bolt (3) with a colored dot.
Replace central bolt (3).
Remove hub (4) towards front.

All:

Install hub with new central bolt.
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 tensioner for drive belt.
Screw in special tool 11 4 362 from special tool set 11 4 360.
Mount special tool 11 9 280 on 11 5 200.
Support special tool 11 9 280 on special tool 11 4 362.
Special tool 11 0 300 secures crankshaft.
Tighten central bolt to jointing torque.
Tightening torque 11 21 1AZ.
Mark central bolt and hub with paint.

Mark special tools with colored mark (1).
See image.

IMPORTANT:
Do not remove the special tool while tightening the central bolt to angle of rotation.
Risk of damage.

If necessary, tighten central bolt to angle of rotation with special tool 00 9 140..
Tightening torque 11 21 1AZ.

Installation note:
Replace crankshaft radial seal at front.