Valve Spring: Service and Repair

11 34 715 - Replacing all valve springs (S65)





Special tools required:
- 11 5 281 11 5 280 Fixture
- 11 5 282 11 5 280 Fixture
- 11 5 821
- 11 9 001
- 11 9 006
- 11 9 008
- 11 9 009
- 11 9 950 11 9 950 Fixture
- 11 9 951 11 9 950 Fixture
- 11 9 953 11 9 950 Fixture






Important!
Risk of damage to cylinder head.

Use only the approved special tools.

Plastic rings on the special tools must not be damaged.

Special tools 11 5 821 and 11 5 282 11 5 280 Fixture must be modified to special tool 11 9 950 11 9 950 Fixture.





Necessary preliminary tasks:
- Remove cylinder head.
- 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.

Note:
Picture shows S85.





Insert aluminium profile rail (1) and align.

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





Important!
Special tools S85 11 5 281 11 5 280 Fixture and 11 5 282 11 5 280 Fixture must be modified to S65 11 9 950 11 9 950 Fixture.

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 9 953 11 9 950 Fixture for securing valve keys.





Unscrew valve cage from special tool 11 5 281 11 5 280 Fixture.

Special tool 11 9 951 (1 to 3) must be replaced.





Remove all washers of special tool 11 5 281 11 5 280 Fixture (S85).

Insert special tool 11 9 951 11 9 950 Fixture in correct order.

Insert washer (1) with collar facing down in valve cage (2).





Insert felt washer (2) with smooth side facing down in valve cage (1).





Insert washer (3) in valve cage (1).

Screw down special tool 11 5 281 11 5 280 Fixture with inserted special tool 11 9 951 11 9 950 Fixture again.





Modify special tool 11 5 281 11 5 280 Fixture with special tool 11 9 951 11 9 950 Fixture.





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 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 11 5 280 Fixture 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 11 5 280 Fixture.

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 9 953 11 9 950 Fixture to install the valve keys - risk of damage!

Press valve key (1) in direction of arrow into special tool 11 9 953 11 9 950 Fixture.





Secure valve keys (1).





Press valve keys into special tool 11 5 282 11 5 280 Fixture with special tool 11 9 953 11 9 950 Fixture.

Note:
Picture shows S85.





Press valve keys into special tool 11 5 282 11 5 280 Fixture with special tool 11 9 953 11 9 950 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 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.