Valve: Service and Repair

11 34 552 - Removing and installing/replacing all valves (S65)





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 9 006
- 11 9 008
- 11 9 009
- 11 9 951 11 9 950 Fixture
- 11 9 952 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.





Necessary preliminary tasks:
- Remove intake air manifold.
- Remove cylinder head cover on left and right.
- Remove cylinder head on left or right.
- Remove all spark plugs.
- If necessary, remove and install engine.





Note:
Place cylinder head (1) 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).





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

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.





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!
In order to avoid damaging the HVCA guide, use only the designated special tools.

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:
Special tool 11 5 281 11 5 280 Fixture incorporates a lever (1) which is tensioned with a spring.

Press down valve spring with special tool 11 9 009 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 11 5 280 Fixture.

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





Remove special tool 11 9 006.

All the engine valves are now accessible.

Installation Note:
Set the engine valves down in neat and tidy order if they are to be reused.

Check valve seat for damage.

Important!
The cylinder head must be replaced if the valve seat is damaged.

Remachining the valve seat ring is not permitted.

Note:
Picture shows S85.





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).





Unscrew valve cage from special tool 11 5 282 11 5 280 Fixture.

Special tool 11 9 952 11 9 950 Fixture must be replaced.





Remove insert washer of special tool 11 5 282 11 5 280 Fixture (S85).

Insert special tool 11 9 952 11 9 950 Fixture in correct order.

Insert special tool 11 9 952 11 9 950 Fixture with taper facing up in valve cage (1) (see arrow).





Press valve keys into special tool 11 9 953 11 9 950 Fixture with special tool 11 5 283 11 5 280 Fixture.

Note:
Picture shows S85.





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





Make sure valve keys (1) are correctly positioned.

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





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 are in correct installation position.





Assemble engine.