Overhaul

11 12 527 - Remachining a valve seat - disassembling cylinder head (N52)





Special tools required:
- 00 5 380
- 11 9 001 11 9 000 Cylinder Head Expander Tool





Necessary preliminary tasks:
- Remove cylinder head Removal and Replacement.
- Remove inlet camshaft Removing and Installing/Replacing Inlet Camshaft.
- Remove exhaust camshaft Removing and Installing/Replacing Exhaust Camshaft.
- Remove all valves Service and Repair.





Place cylinder head on special tool 11 9 001 11 9 000 Cylinder Head Expander Tool.
Inset pilot from special tool 00 5 380 5 mm into a valve stem.
Select a suitable valve seat milling cutter (1).
Turn the milling cutter clockwise while applying low pressure. When the milling operation is finished, perform a further 2 turns without applying pressure to the cutter.

Important!
If necessary, perform inner and outer seat corrections.





Assemble engine.