Valve Spring: Service and Repair

11 34 715 Replacing all valve springs (N63)





Special tools required:
^ 11 4 480
^ 11 8 840
^ 11 9 000
^ 11 9 006
^ 11 9 008





Necessary preliminary tasks:
^ Remove left cylinder head
^ Remove right cylinder head
^ Remove camshafts

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








Prepare special tool 11 9 008 on special tool 11 9 006.





Position special tool 11 9 006 with silicone cushion on cylinder head.

Slide locks (1) in direction of arrow and pretension with eccentric shaft.

Press down valve spring with special tool 11 8 840.








Remove valve cotters (1) with a magnet.

Place valve springs and valve keys on special tool 11 4 480 in an orderly manner.





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 is decisive for the correct installation of the valve springs.
Install valve spring so that larger diameter points to spring plate at bottom.





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





Assemble engine.