Mercedes-Benz 603 Service Manual page 277

Note
Clamp cylinder head in the clamp fixture for
dismantling and machining. Machine valve seats
with valve seat turning equipment, with valve
seat grinder or valve seat miller. The location of
the hydraulic valve clearance compensating
elements must be checked after machining the
valve seat Inserts and, if required corrected
(05211).
Machining valve seats
Machine valve seat (45" ) (see tool
1
manufacturer' s operating Instructions).
Caution!
Only loosen pilot (5) when eccentricity of the
valve seat has been checked.
2 Check eccentricity of valve seat
0.03
(max. mm).
Slide fitting sleeve 19) and dial gauge holder
(20) and dial gauge (18) onto the pilot (5).
3
Measure valve seat width (b) and, if required
make a 15" adjustment at the top (p) and 65"
adjustment at the bottom (y).
Valve seat width (b)
Intake: 1.2 1.7 mm
Exhaust: 1.5 2.0 mm.
05
6 Clamping fixture
8 Forward feed operation
EXIT