Technical data

C
ylinder Head
Table: Valve sit back
6
The valves should sit back as measured from the seating surface of the cylinder head, according to the
following table:
Repair Data Valves
Cylinder Head Dimension
D7 nominal
values
Max. allowable
wear (mm)
Remarks
Valve clearance
cold
Intake valve stem
dia
Exhaust valve
stem dia
Intake valve
disc dia
Exhaust valve disc
dia
Valve sit back max
Valve sit back min
Valve guide bore
Outer diameter
Valve guide bore in
cylinder head
Valve guide press
in force
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
kp
0.15
7
7
30.5
30.5
0.70
0.45
7
10
10
100
0.05
0.05
0.05
CAUTION!
Valve sit back may not be less
than 0.45 mm as otherwise the
danger exists that the valve disc
hits the piston.
The sealing surface of the
cylinder head can be reworked to
a maximum of 0.5 mm if the sit
back of
0.7 mm is exceeded due to valve
seat milling.
With the cylinder head cold.
-0.04
-0.05
-0.05
-0.04
+0.09
0
+0.023
+0.029
+0.0011