Valve Spring: Service and Repair

11 34 715 - Replacing all valve springs (S85)

Special tools required:
- 11 5 281 11 5 280 Fixture
- 11 5 282 11 5 280 Fixture
- 11 5 283 11 5 280 Fixture
- 11 9 001 11 9 000 Cylinder Head Expander Tool
- 11 9 006 11 9 000 Cylinder Head Expander Tool
- 11 9 008 11 9 000 Cylinder Head Expander Tool
- 11 9 009 11 9 000 Cylinder Head Expander Tool

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.
- Remove all HVCA elements Service and Repair.

Note:
Place cylinder head (1) with cylinder head bolts on special tool 11 9 001 11 9 000 Cylinder Head Expander Tool.

Prepare special tool 11 9 006 11 9 000 Cylinder Head Expander Tool with special tool 11 9 008 11 9 000 Cylinder Head Expander Tool.

Insert aluminium profile rail (1) and align.

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

Special tool 11 5 281 11 5 280 Fixture for removing valve keys.

Special tool 11 5 282 11 5 280 Fixture for installing valve keys.

Special tool 11 5 283 11 5 280 Fixture for securing valve keys.

Important!
Use only approved special tools.

Risk of damage to the HVCA guide.

Adjust special tool 11 9 009 11 9 000 Cylinder Head Expander Tool so that special tool 11 5 281 11 5 280 Fixture can press vertically onto the valve spring.

Note:
Lever (1) on special tool 11 5 281 11 5 280 Fixture 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).

Note:
Lower spring plate (1).

Progressive valve spring (2).

Upper spring plate (3).

Installation Note:
Incorrect installation is not possible.

Insert lower spring plate (1).

Important!
Use only special tool 11 5 282 11 5 280 Fixture to install the valve keys - risk of damage!

Press valve key (1) in direction of arrow into special tool 11 5 283 11 5 280 Fixture.

Secure valve keys (1).

Press valve keys into special tool 11 5 282 11 5 280 Fixture with special tool 11 5 283 11 5 280 Fixture.

Special tool 11 5 282 11 5 280 Fixture is prepared for installation.

Installation Note:
Positioning of valve keys (1).

Press down special tool 11 5 282 11 5 280 Fixture with special tool 11 9 009 11 9 000 Cylinder Head Expander Tool in direction of arrow.

Installation Note:
Both valve keys are now pressed into their initial positions.

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

Assemble engine.