Mercedes-Benz 603 Service Manual page 269

Broach base bore in cylinder head
(Repair stage)
Decarbonize and clean cylinder head carefully,
particularly the inside of the valve seat inserts.
Select correct guide sleeve (2) and remove
swarf from the tip of the broach (1) with a stiff
plastic brush or srmilar tool.
Note
The broach cutter must be cleaned before each
broaching operating.
Provide guide sleeve, basic bore and complete
broach with ample supplies of paraffin.
Insert broach into the guide sleeve so that when
the guide sleeve rests on the valve seat insert
(3) the first cutter of the broach is located in the
base bore. In so doing note that the correct side
of the guide sleeve is put on the valve seat.
Centre guide sleeve by rotary movements in the
valve seat insert.
Note
aluminium mandrel, approx. 130 mm long, and a
plastic hammer of approx. 250 g.
05.10 285
1
2 Guide s l e e v e
seat tnser-t
3 Valve
EXIT