Valve Spring: Service and Repair

11 34 715 - Replacing all valve springs (N12)





Special tools required:
- 11 4 480 11 4 480 Oddments Tray
- 11 9 000 11 9 000 Device
- 11 9 006
- 11 9 007
- 11 9 017





Necessary preliminary tasks:
- Remove cylinder head Removal and Replacement.
- Remove exhaust camshaft Removing and Installing/Replacing Exhaust Camshaft.
- Remove intermediate lever Removing and Installing/Replacing Intermediate Levers.
- Remove inlet camshaft Removing and Installing/Replacing Inlet Camshaft.
- Remove roller cam follower Service and Repair.





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.