11 21 505 Sealing crankcase lower section (N52K): Notes

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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 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).

IMPORTANT: Changed procedure.
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).

Fig 1: Pulling Oil Pump Intake Pipe

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Release screws (1).

Jointing torque: 4 Nm ; Angle of rotation: 90°

Installation:

Replace aluminum screws.

Remove oil deflector (2).

Fig 2: Identifying Oil Deflector And Screws

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Secure oil pump sprocket with steel pin 6.0 mm (3) to oil pump.

IMPORTANT: Release central bolt (2) only together with steel pin 6.0 mm (3).
Do not remove sprocket.

Release central bolt (2).

Jointing torque: 20 Nm ; Angle of rotation: 45°

Fig 3: Identifying Oil Pump Sprocket Steel Pin And Central Bolt

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Unfasten screws (2).

Jointing torque: 4 Nm ; Angle of rotation: 45°

Installation:

Replace aluminum screws.

Fig 4: Identifying Aluminum Screws

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Remove screw plug (1) from crankcase at front.

NOTE: Replace gasket.

Fig 5: Identifying Crankcase Screws Plug

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Release screw (1) for oil pump triangular drive with special tool 11 8 640.

NOTE: It is not necessary to remove the triangular drive.

Fig 6: Identifying Oil Pump Screw

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