Valve Spring: Service and Repair

11 34 715 Replacing All Valve Springs (N16)

Special tools required:







Necessary preliminary tasks:
- Remove cylinder head.
- Remove exhaust camshaft.
- Remove intermediate lever.
- Remove intake camshaft.
- Remove roller cam follower.







Mount 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 eccentric (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 keys with a magnet.
Remove valve spring and spring cup.
Set down on special tool 11 4 480 in a tidy and orderly fashion.







IMPORTANT:
Incorrect assembly possible.
Incorrect assembly will result in valve spring breakage.

Colour coding (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 cup, bottom
3) Valve spring
4) Top spring cup
5) Valve keys







Assemble engine.
Check function of Digital Engine Electronics; if necessary, readjust uniform mixture distribution.