11 13 000 Removing and installing, sealing or replacing oil sump (N52) AWD

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.

The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.

Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Remove engine splash guard.
Secure engine in Installation Position.
Lower Front Axle.
Remove left drive shaft.
Remove right drive shaft.
Remove front axle differential.

NOTE: The lines must be detached from the engine oil sump in the case of the optional extra automatic transmission; if necessary, detach vane pump and place to one side.

Release bolts (3) on transmission.

Detach return hose (2).

Release screws along line (1).

Installation:

Replace aluminium screws.

Replace all seals.

If necessary, release bolts (4), remove oil level sensor.

NOTE: Fig 1 shows N52.

Fig 1: Identifying Oil Level Sensor, Return Hose, Retaining Screws And Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.