Necessary preliminary tasks

• Remove CYLINDER HEAD COVER 

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

Fig 1: Turning Eccentric Shaft To Minimum Lift

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Fig 2: Identifying Oil Spray Nozzle, Spline Teeth And Screw

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Secure special tool 11 4 270 to guide block (2) using locking pliers (3).

Fig 3: Identifying Gripping Pliers And Guide Block With Special Tool (11 4 270)

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

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

Press special tool 11 4 270 to stop in direction of arrow.

Release screw (2) of torsion spring.

Tightening torque 11 37 2AZ .

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

Fig 5: Removing Torsion Spring Screw

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

Installation: 

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

Fig 6: Identifying Return Spring And Metal Lugs

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Press torsion spring apart at positions (1).

Remove torsion spring towards top.

Fig 7: Pressing Torsion Spring Apart

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Fig 8: Identifying Components With Special Tool (11 4 481)

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

1. Eccentric shaft with bearing
2. Bearing caps of eccentric shaft (set out in order)
3. Intake camshaft
4. Bearing caps of inlet camshaft (set out in order)
5. Intake 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 .

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 9: Identifying Screws And Guide Block

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Installation: 

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

Fig 10: Identifying Guide Block Contact Surface

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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.