Valve Spring: Service and Repair

11 34 715 - Replacing all valve springs (N52K)





Special tools required:
- 11 0 346
- 11 4 480 11 4 480 Oddments Tray
- 11 9 000 11 9 000 Device
- 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 cam followers Service and Repair





Place cylinder head on special tool 11 9 000.
Press down inlet valves with special tool 11 9 017.
Press down exhaust valves with special tool 11 0 346.





Remove valve cotters with a magnet.
Remove valve spring with spring plates.
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 plate.





Arrangement:
1) - Valve
2) - Valve stem seal with lower spring plate
3) - Valve spring
4) - Upper spring plate
5) - Valve tapers





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