Valve Spring: Service and Repair

11 34 715 Replacing all valve springs (N52T)

Special tools required:





Necessary preliminary work:
^ Remove cylinder head.
^ Remove exhaust camshaft.
^ Remove intermediate lever
^ Remove intake camshaft
^ Remove rocker arm





Place cylinder head on special tool 11 9 000.

Press down inlet valves with special tool 11 9 017.

Press down outlet valves with special tool 11 0 346.





Remove valve keys with a magnet.

Remove valve spring with spring cups.

If the individual components are to be reused, they must be placed in neat order in special tool 11 4 480.





Important!
Incorrect installation possible.
Incorrect installation will result in valve spring breakage.
Risk of mixing up the valve springs for the inlet and exhaust valves.

The valve spring is colour-coded (1) at the lower end.

Install the valve spring so that the larger diameter points to the lower spring cup.





Arrangement:
1) Valve
2) Valve stem seal with lower spring cup
3) Valve spring
4) Upper spring cup
5) Valve keys





Assemble engine.

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