11 37 010 Removing and installing/replacing intermediate levers (N52)

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2008 BMW Z4, 2007 BMW Z4, 2007 BMW 530xi, 2007 BMW 530i, and 2007 BMW 525xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 4 270
11 4 450
11 4 481

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 Cylinder Head Cover .

If necessary, set eccentric shaft (1) on twin surface to minimum lift (2).

Fig 1: Identifying Eccentric Shaft And Lift

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Secure special tool 11 4 270 with gripping pliers (3) to guide block (2).

IMPORTANT: Special tool 11 4 270 is only secured to guide block.

Adjusting the gripping pliers (3) is not permitted (risk of damage) on special tool 11 4 270.

Fig 2: Identifying Special Tool (11 4 270), Gripping Pliers And Guide Block

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NOTE: The oil nozzle must be removed beforehand from cylinder no. 3.

WARNING: Risk of injury in event of incorrect use.

IMPORTANT: Incorrect handling risk of damage.

Secure both bearing pins (2) in return spring with knurled screw (1) on special tool 11 4 270.

Press special tool 11 4 270 in direction of arrow as far as it will go.

Fig 3: Identifying Special Tool (11 4 270), Screw And Bearing Pins

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Release steel screw (2).

To avoid jamming with screw (2) and return spring, it is necessary when releasing screw (2) to relieve the pretension on special tool 11 4 270 uniformly.

IMPORTANT: Risk of damage to cylinder head thread.

For tightening torque refer to 11 37 2AZ in 11 37 VARIABLE VALVE GEAR (N52) .

Fig 4: Identifying Special Tool (11 4 270) And Steel Screw

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Relieve tension on return spring (1) with special tool 11 4 270.

NOTE: Metal lug (2) cannot be disassembled and must not be removed.

Installation:

Replace metal lug if tab washer is defective.

Fig 5: Identifying Special Tool (11 4 270), Return Spring And Metal Lug

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Press return spring apart at position (1) and remove towards top.

Fig 6: Identifying Return Spring

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IMPORTANT: Uniform distribution must not be changed.

All components must be set down in a clean and orderly fashion.

All components must be reinstalled in the same positions in an engine which has already been in use.

Eccentric shaft with bearing.
Bearing caps of eccentric shaft set out in order.
Inlet camshaft.
Bearing caps of inlet camshaft set out in order.
Inlet valves with valve springs.
Valve plates and valve tapers.
Roller cam followers with HVC element set out in order.
Return springs.
Guide blocks set out in order.
Intermediate levers set out in order.

Fig 7: Identifying Special Tool (11 4 481)
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Release screws (1).

For tightening torque refer to 11 37 1AZ in 11 37 VARIABLE VALVE GEAR (N52) .

Set down guide blocks (2) in special tool 11 4 481 in neat order.

Installation:

Mixing up the guide blocks may cause the engine to demonstrate idle fluctuations.

This will result in maladjustment of uniform distribution.

Fig 8: Identifying Guide Blocks And Screws

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Installation:

Contact surfaces (1) must be clean and oil-free.

Clean if necessary.

Fig 9: Identifying Guide Block Contact Surfaces

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Lift out intermediate levers (2).

Intermediate levers (2) set out in special tool 11 4 481 in order.

Installation:

Mixing up the intermediate levers may cause the engine to demonstrate RPM fluctuations.

Installation:

Contact surfaces (1) must be clean and oil-free.

Clean if necessary.

Fig 10: Identifying Intermediate Levers And Contact Surfaces

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All intermediate levers (1) are classified.

Reinstall intermediate levers which have already been used in the same positions.

Fig 11: Identifying Intermediate Levers Classification Numbers

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Installation:

Before reinstalling the intermediate levers, make sure the roller cam followers are correctly positioned (risk of damage).

Install intermediate levers (2).

Fig 12: Identifying Intermediate Levers

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Fit guide block (2) cleanly into opening.

Tighten bolts (1) hand-tight.

Check both intermediate levers again to ensure correct installation position.

Release bolts (1) again by a 1/4 turn.

Fig 13: Identifying Guide Blocks And Bolts

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Secure special tool 11 4 450 to bolt connection (1) of eccentric shaft.

Turn eccentric lever (3) on special tool 11 4 450 in direction of arrow.

Guide block is now tensioned.

Secure bolts (2).

For tightening torque refer to 11 37 1AZ in 11 37 VARIABLE VALVE GEAR (N52) .

Fig 14: Identifying Special Tool (11 4 450), Eccentric Lever, Bolt And Bolt Connection

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Installation:

At cylinder no. 3, the guide block can be pre-installed with one bolt (2) only.

Fit oil pump only after retaining spring has been fitted.

Fit return spring on guide block.

Installation:

Insert return spring (2) in intermediate lever (1).

Check roller cam follow (3) again to ensure correct installation position.

Fig 15: Identifying Roller Cam Follow, Return Spring And Intermediate Lever

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Secure special tool 11 4 270 with gripping pliers (3) to guide block (1).

IMPORTANT: Special tool 11 4 270 is only secured to guide block.
Adjusting the gripping pliers (3) is not permitted (risk of damage) on special tool 11 4 270.

Fig 16: Identifying Special Tool (11 4 270) And Guide Block

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WARNING: Risk of injury in event of incorrect use.

IMPORTANT: Incorrect handling risk of damage.

Secure both bearing pins (2) in return spring with knurled screw (1) on special tool 11 4 270.

IMPORTANT: Check return spring again on intermediate lever to ensure correct installation position.

Fig 17: Identifying Special Tool (11 4 270), Bearing Pins And Knurled Screw

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Press special tool 11 4 270 in direction of arrow as far as it will go.

Insert steel screw (2).

To avoid jamming with screw (2) and return spring, it is necessary when inserting screw (2) to increase the pretension on special tool 11 4 270 uniformly.

IMPORTANT: Risk of damage to cylinder head thread.

For tightening torque refer to 11 37 2AZ in 11 37 VARIABLE VALVE GEAR (N52) .

Remove special tool 11 4 270.

Fig 18: Identifying Special Tool (11 4 270) And Steel Screw

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At cylinder no. 3, adjust oil nozzle (2) exactly so that oil spray (3) points precisely towards spline teeth.

Fig 19: Identifying Oil Spray And Oil Nozzle

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Assemble engine.