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 Placement Boards (2 X)
- 11 9 000
- 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 (N52K)
- 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 11 4 480 Placement Boards (2 X).





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 color-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.