11 34 715 Replacing All Valve Springs (S85)

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Special tools required:

11 5 281
11 5 282
11 5 283
11 9 001
11 9 006
11 9 008
11 9 009

IMPORTANT: Risk of damage to cylinder head.
Use only the approved special tools.
Plastic rings on the special tools must not be damaged.

Necessary preliminary tasks:

Remove cylinder head. See 11 12 105 Removing And Installing Left Cylinder Head (S85) or 11 12 106 Removing And Installing Right Cylinder Head (S85) .
Remove all HVCA elements.

NOTE: Place cylinder head (1) with cylinder head bolts on special tool 11 9 001.

Prepare special tool 11 9 006 with special tool 11 9 008.

Fig 1: Identifying Special Tool 11 9 006 And Cylinder Head

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Insert aluminum profile rail (1) and align.

Secure eccentric clamping levers (2 and 3) in direction of arrow.

Fig 2: Inserting Aluminum Profile Rail

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Special tool 11 5 281 for removing valve keys.

Special tool 11 5 282 for installing valve keys.

Special tool 11 5 283 for securing valve keys.

Fig 3: Identifying Special Tool 11 5 281, 11 5 282 And 11 5 283

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IMPORTANT: Use only approved special tools.
Risk of damage to the HVCA guide.

Adjust special tool 11 9 009 so that special tool 11 5 281 can press vertically onto the valve spring.

Fig 4: Identifying Special Tool 11 9 009 And 11 5 281

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NOTE: Lever (1) on special tool 11 5 281 is tensioned with a spring.

Press down valve spring with special tool 11 5 281 and keep pressed.

Pretension lever (1) in direction of arrow.

Release lever (1) in tensioned position.

The valve keys still installed are thus forced out and drop into the working chamber of special tool 11 5 281.

Repeat the operation several times if necessary until all the valve keys are forced out.

Pull back lever on special tool 11 5 281.

Valve keys (1) can now be ejected from the working chamber (2).

Fig 5: Pretensioning Lever

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Fig 6: Identifying Valve Keys And Working Chamber

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NOTE: Lower spring plate (1).
Progressive valve spring (2).
Upper spring plate (3).

Installation:

Incorrect installation is not possible.

Fig 7: Identifying Lower/Upper Spring Plate And Progressive Valve Spring

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Insert lower spring plate (1).

Fig 8: Identifying Lower Spring Plate

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IMPORTANT: Use only special tool 11 5 282 to install the valve keys - risk of damage!

Press valve key (1) in direction of arrow into special tool 11 5 283.

Fig 9: Pressing Valve Key Into Special Tool 11 5 283

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Secure valve keys (1).

Fig 10: Identifying Valve Keys

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Press valve keys into special tool 11 5 282 with special tool 11 5 283.

Fig 11: Identifying Special Tool 11 5 282 And 11 5 283

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Press valve keys into special tool 11 5 282 with special tool 11 5 283.

Fig 12: Pressing Valve Keys Into Special Tool 11 5 282 With Special Tool 11 5 283

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Special tool 11 5 282 is prepared for installation.

Installation:

Positioning of valve keys (1).

Fig 13: Identifying Valve Keys And Special Tool 11 5 282

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Press down special tool 11 5 282 with special tool 11 9 009 in direction of arrow.

Installation:

Both valve keys are now pressed into their initial positions.

Fig 14: Pressing Down Special Tool 11 5 282 With Special Tool 11 9 009

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Installation:

Check that valve keys (1) are in correct installation position.

Fig 15: Identifying Valve Keys

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Assemble engine.