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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Position special tool 11 7 110 on return spring (1) (see arrows).

Fig 3: Locating Special Tool (11 7 110) On Return Spring

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Place special tool 11 7 110 flat on cylinder head.

Turn knurled screw (1) in direction of arrow until both clamping levers secure return spring in guide block.

Fig 4: Turning Knurled Screw

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Return spring is correctly preloaded when both clamping levers are parallel to guide block.

Fig 5: Identifying Guide Block With Special Tool 11 7 110

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Left and right return springs (1) must be positioned in lateral guide of special tool 11 7 110 .

Fig 6: Identifying Return Springs In Lateral Special Tool 11 7 110 Lateral Guide

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Preload return spring with lever (1) on special tool 11 7 110 in direction of arrow.

Fig 7: Identifying Return Spring With Lever And Special Tool 11 7 110

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Lock special tool 11 7 110 with catch on lever (1).

Fig 8: Locking Special Tool 11 7 110 With Catch On Lever

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Release screw (1).

Fig 9: Identifying Special Tool 11 7 110 And Screws

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Risk of damage! 

Fig 10: Identifying Latching Hook, Lever With Special Tool 11 7 110

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Secure lever (1)

Press back latching hook (2).

Return spring tension can now be released.

Release knurled screw (1) on special tool 11 7 110 in direction of arrow.

Fig 11: Releasing Knurled Screw On Special Tool 11 7 110

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Release special tool 11 7 110 in direction of arrow from return spring (1).

Fig 12: Releasing Special Tool 11 7 110

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Press torsion spring apart at positions (1).

Remove torsion spring towards top.

Fig 13: Pressing Torsion Spring Apart

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Fig 14: 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 15: Identifying Guide Block With Mounting Screws

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