11 21 505 Sealing crankcase lower section (N52K): Notes
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 color 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).
It is not necessary to remove the cylinder head and the crankshaft.
Necessary preliminary tasks:
- Remove ENGINE .
- Mount engine on ASSEMBLY STAND .
- Remove CLUTCH (if fitted).
- Remove left and right engine support arm. See LEFT ENGINE SUPPORT ARM and RIGHT ENGINE SUPPORT ARM .
- Remove OIL SUMP .
Release screws (1).
Pull out oil pump intake pipe (2).
Release screws (1).
Jointing torque: 4 Nm ; Angle of rotation: 90°
Installation:
Replace aluminum screws.
Remove oil deflector (2).
Secure oil pump sprocket with steel pin 6.0 mm (3) to oil pump.
Do not remove sprocket.
Release central bolt (2).
Jointing torque: 20 Nm ; Angle of rotation: 45°
Unfasten screws (2).
Jointing torque: 4 Nm ; Angle of rotation: 45°
Installation:
Replace aluminum screws.
Remove screw plug (1) from crankcase at front.
Release screw (1) for oil pump triangular drive with special tool 11 8 640.