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11 37 010 Removing and installing/replacing intermediate levers (N52K)

WARNING: This page is about a different variant/trim than selected.

Special tools required: 

IMPORTANT: Aluminum screws/bolts must be replaced each time they are released  .
The end faces of aluminum 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: 

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

Fig 1: Eccentric Shaft
G04751039Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Oil spray nozzle must be removed from 3rd cylinder (make a note of installation position of oil spray nozzle).

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 (2).
Adjusting the gripping pliers (3) on special tool 11 4 270  is not permitted. Risk of damage! 
Fig 2: Special Tool (11 4 270 ) - Gripping Pliers And Guide Block
G04751230Courtesy of BMW OF NORTH AMERICA, INC.
WARNING: Risk of injury in event of incorrect use.
IMPORTANT: Improper handling. Risk of damage! 

Secure both bearing pins (2) in torsion springs with knurled screw (1) of special tool 11 4 270  .

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

Fig 3: Securing Bearing Pins In Torsion Springs With Knurled Screw
G04751231Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (2) of torsion spring.

Tightening torque: 11 37 2AZ, see 11 37 VARIABLE VALVE GEAR .

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

IMPORTANT: Thread on cylinder head. Risk of damage! 
Fig 4: Torsion Spring Screw And Special Tool (11 4 270)
G04787079Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Installation: 

Replace torsion spring (1) if metal lug (2) is faulty.

Fig 5: Special Tool (11 4 270), Torsion Spring And Metal Lug
G04751233Courtesy of BMW OF NORTH AMERICA, INC.

Press torsion spring apart at positions (1).

Remove torsion spring towards top.

Fig 6: Removing Torsion Spring
G04751234Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Uniform distribution must not  be changed.
Place all components in clean and neat order  in special tool 11 4 481.

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

Fig 7: Torsion Springs, Inlet Camshaft, Guide Blocks And Special Tools (11 4 481)
G04751235Courtesy of BMW OF NORTH AMERICA, INC.
  1. Eccentric shaft with bearing
  2. Bearing caps of eccentric shaft (set out in order)
  3. Inlet camshaft
  4. Bearing caps of inlet camshaft (set out in order)
  5. Inlet valves with valve springs
  6. Valve plates and valve cotters
  7. Cam followers with HVCA elements (set out in order)
  8. Torsion springs
  9. Guide blocks (set out in order)
  10. Intermediate levers (set out in order)

Release screws (1) on guide block (2).

Tightening torque: 11 37 1AZ, see 11 37 VARIABLE VALVE GEAR .

Place all guide blocks (2) in neat order in special tool 11 4 481  .

Installation: 

Mixing up the guide blocks (2) will cause the engine to suffer idle-speed fluctuations.

This will result in maladjustment of uniform distribution  .

Fig 8: Screws And Guide Block
G04751236Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

All contact surfaces (1) of guide block must be clean and free from oil and grease. If necessary, clean contact surfaces (1).

Fig 9: Guide Block Contact Surfaces
G04751237Courtesy of BMW OF NORTH AMERICA, INC.

Lift out intermediate levers (2).

Place all intermediate levers (2) in neat order in special tool 11 4 481  .

Installation: 

Mixing up the intermediate levers (2) will cause the engine to suffer idle-speed fluctuations.

Installation: 

All contact surfaces (1) must be clean and free from oil and grease. If necessary, clean contact surfaces (1).

Fig 10: Contact Surfaces And Intermediate Levers
G04751238Courtesy of BMW OF NORTH AMERICA, INC.

All intermediate levers (1) are classified.

All intermediate levers (1) must be reinstalled in the same positions in an engine which has already been in use.

Fig 11: Intermediate Lever Classification
G04751239Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: Before installing intermediate levers (2), make sure cam followers are correctly positioned.
Risk of damage! 

Install intermediate levers (2).

Fig 12: Contact Surfaces And Intermediate Levers
G04751238Courtesy of BMW OF NORTH AMERICA, INC.

Fit guide block (2) cleanly into opening.

Tighten screws (1) hand-tight.

Check that intermediate levers are in correct installation position.

Release  screws (1) by a 1/4 turn.

Fig 13: Screws And Guide Block
G04751236Courtesy of BMW OF NORTH AMERICA, INC.

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 pretensioned.

Insert screws (2) of guide blocks.

Tightening torque: 11 37 1AZ, see 11 37 VARIABLE VALVE GEAR .

Installation: 

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

Oil spray nozzle is fitted only after torsion spring has been installed.

Fig 14: Turning Eccentric Lever On Special Tool (11 4 450)
G04751242Courtesy of BMW OF NORTH AMERICA, INC.

Install torsion spring (2) on guide block.

Installation: 

Insert torsion spring (2) in intermediate lever (1) (see arrow).

Check that cam follower (3) is in correct installation position.

Fig 15: Inserting Torsion Spring In Intermediate Lever
G04751243Courtesy of BMW OF NORTH AMERICA, INC.

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 (2).
Adjusting the gripping pliers (3) on special tool 11 4 270  is not permitted. Risk of damage! 
Fig 16: Special Tool (11 4 270 ) - Gripping Pliers And Guide Block
G04751230Courtesy of BMW OF NORTH AMERICA, INC.
WARNING: Risk of injury in event of incorrect use.
IMPORTANT: Improper handling. Risk of damage! 

Secure both bearing pins (2) in torsion springs with knurled screw (1) of special tool 11 4 270  .

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

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

Fig 17: Securing Bearing Pins In Torsion Springs With Knurled Screw
G04751231Courtesy of BMW OF NORTH AMERICA, INC.

Insert screw (2) of torsion spring.

Tightening torque: 11 37 2AZ, see 11 37 VARIABLE VALVE GEAR .

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

IMPORTANT: Thread on cylinder head. Risk of damage! 

Remove special tool 11 4 270  .

Fig 18: Torsion Spring Screw And Special Tool (11 4 270)
G04751232Courtesy of BMW OF NORTH AMERICA, INC.

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

Insert screw (1) with oil spray nozzle (2) (external).

Tightening torque: 11 37 4AZ, see 11 37 VARIABLE VALVE GEAR .

Fig 19: Screw And Oil Spray Nozzle
G04751247Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

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