11 34 552 Removing and installing/replacing all valves (S65)
Special tools required:
- 11 5 281
- 11 5 282
- 11 5 283
- 11 9 001
- 11 9 006
- 11 9 008
- 11 9 009
- 11 9 951
- 11 9 952
- 11 9 953
See ENGINE - SPECIAL TOOLS .
Use only the approved special tools.
Plastic rings on the special tools must not be damaged.
Necessary preliminary tasks:
- Remove intake air manifold.
- Remove left cylinder head cover and right cylinder head cover .
- Remove cylinder head on left and right .
- Remove all spark plugs. See 12 12 011 REPLACING ALL SPARK PLUGS (S65) .
- If necessary, remove and install engine .
Prepare special tool 11 9 006 with special tool 11 9 008 .
Insert aluminum profile rail (1) and align.
Secure eccentric clamping levers (2 and 3).
Special tool 11 5 281 for removing valve keys.
Special tool 11 5 282 for installing valve keys.
Unscrew valve cage from special tool 11 5 281 .
Special tool 11 9 951 (1 to 3) must be replaced.
Remove all washers of special tool 11 5 281 (S85).
Insert special tool 11 9 951 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 with inserted special tool 11 9 951 again.
Modify special tool 11 5 281 with special tool 11 9 951 .
Adjust special tool 11 9 009 so that special tool 11 5 281 can press vertically onto the valve 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 .
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).
Remove special tool 11 9 006 .
All the engine valves are now accessible.
Installation:
Set the engine valves down in neat and tidy order if they are to be reused.
Check valve seat for damage.
Remachining the valve seat ring is not permitted.
Press valve key (1) in direction of arrow into special tool 11 9 953 .
Secure valve keys (1).
Unscrew valve cage from special tool 11 5 282 .
Special tool 11 9 952 must be replaced.
Remove insert washer of special tool 11 5 282 (S85).
Insert special tool 11 9 952 in correct order.
Insert special tool 11 9 952 with taper facing up in valve cage (1) (see arrow).
Press valve keys into special tool 11 9 953 with special tool 11 5 283 .
Press valve keys in direction of arrow into special tool 11 5 282 with special tool 11 9 953 .
Make sure valve keys (1) are correctly positioned.
Special tool 11 5 282 is prepared.
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.
Installation:
Check that valve keys are in correct installation position.
Assemble engine.