Valve Spring: Service and Repair

11 34 715 Replacing all valve springs (N12)

Special tools required:
^ 11 4 480
^ 11 9 000
^ 11 9 006
^ 11 9 007
^ 11 9 017

Necessary preliminary tasks:
^ Remove cylinder head.
^ Remove exhaust camshaft.
^ Remove intermediate lever.
^ Remove inlet camshaft.
^ Remove roller cam follower.

Place cylinder head (1) on special tool 11 9 000.





Prepare special tool 11 9 007 on special tool 11 9 006.





Align special tool 11 9 006.
Lock eccentrics (1) on special tool 11 9 000 in direction of arrow.





Press down valve spring and spring retainer (1) with special tool 11 9 017.





Remove valve tapers with a magnet.
Remove valve spring and spring retainer.
Set down on special tool 11 4 480 in a tidy and orderly fashion.





Important:
Incorrect installation possible.
Incorrect installation will result in valve spring breakage.

Color marking (1) is normally on lower end of valve spring.
Only the diameter pointing to the spring retainer at the bottom is required for correct installation of the valve spring.





Arrangement:
1) Valve
2) Valve stem seal with spring plate, bottom
3) Valve spring
4) Top plate spring
5) Valve tapers





Assemble engine.
Check function of DME; if necessary, readjust uniform mixture distribution.